car audio speaker music

Simple Car Audio Upgrades

It is quite common for me to be asked how we keep busy. The next comment is usually that surely all modern cars have a great audio system. Well, the short answer is no they don’t but in truth, they are adequate for a lot of drivers because they have never experienced a great in-car audio system. Car manufacturers know this and exploit what we perceive to be good audio by over compensating one aspect of the sound to create an initial impression of quality. Porsche are a prime example with audio that is way too bass biased, initially impressive but very wearing after extended listening. The new Audi systems seem to be mid-range biased and now lack a real usable bass response and that is even worse for the B&O equipped cars.

In my opinion, very few factory standard audio systems offer an acceptable performance and almost all the so called upgrade options are a complete waste of money. One piece of advice I would offer is to never tick the audio upgrade option when buying a new car. Save your money, bring the car here and let me upgrade it properly. My system will be far better, guaranteed and may even be less expensive.

If you follow the Car and Home Stereo Facebook feed then you will have seen the picture of the Peugeot 208 speaker I posted but I must share it here also;

Peugeot 208 speaker

This is what Peugeot feel is acceptable; I think it is one of the worst things I have heard. The only reason this sounds reasonable is that the audio system keeps control of the bass so that you cannot push it too hard leaving you with a weak sounding system.

The speaker next to it is the Audison Prima APX6.5 which fits perfectly and with the addition of a generous amount of Skinz sound deadening treatment inside the door the immediate improvement is amazing.

Skinz around speaker mount

We also apply Skinz around the speaker mount to absorb any resonance in the mounting panel.

As mentioned, this simple speaker upgrade really improves the sound but the power available from the factory audio is a bit feeble. To overcome this we recommend an amplifier to boost the power and improve the dynamic range, an ideal solution is the new Hertz DPower 4. This compact amplifier is easy to tuck away and is fully D class which reduces the amount of waste heat while maximising power.

Hertz DPower 4.

As a four channel amp, this could be configured to just drive the front speakers but we wanted a better bass response and that meant adding a subwoofer. Therefore the amplifier was configured for three channel operation with 60W going to each speaker and the bridged 150W output being sent to the ever popular JL Audio CP108 microsub in the boot.JL Audio CP108 microsub

This sub was chosen as a perfect combination of compact size and high performance. The Peugeot 208 boot is not huge and we did not want to take it over. The client wanted deep, powerful bass that would complement his music choice. So the CP108 was the perfect choice with its 8w3 speaker and specially designed slot ported, high output enclosure this would tuck neatly to one side of the boot leaving nearly all the load space.

This was shaping up to be a great sounding install but there was one more sticking point; the factory head unit. If you know the 208 then you will know that like many new cars today there is no CD player and a touchscreen infotainment display is your interface to both the car systems and the audio. Changing this is not an option but as previously mentioned it has some undesirable characteristics as far as the audio is concerned. The lack of CD player is not unusual but this means we are reliant on either BlueTooth streaming, USB or iPod source none of which are the best quality. If we just fed this signal directly to the amplifier then it would be improved yes but not to the standard to which the equipment is capable.

There are two products that we considered for this installation; the JL Audio FiX82 and the Audison Bit 10. The JL Audio FiX82 is a brilliant device that connects to the factory head unit and corrects all the anomalous EQ and time correction issues fully automatically. It will provide a clean response from just about any head unit out there so is an obvious choice for almost every installation that uses the original head unit.

However, for this installation, we opted for the Audison Bit 10 as we wanted the capacity to manually tune the system. While both products offer tuning capability via a laptop the Bit 10 has a deeper level of control and we felt that this would benefit our client.Audison Bit 10 compact unit

This compact unit was able to disappear under the driver’s seat with the amplifier so the only visible part of this installation was the subwoofer in the boot. As this was his first car there was a chance he would not keep it too long so we made sure that everything could be removed and the original system reinstated without any marks.

The audio performance from this was excellent and the big smile from the owner said it all. Quite honestly this simple system would easily outperform anything Audi or BMW could offer whether it standard, Bose or Harman Kardon.

But what is the cost you ask?

Well the installation took a full day as we made custom installation parts, sound deadened the doors and of course carefully tuned it to our client’s personal tastes. The total was still under £1500. That’s much less than most factory audio upgrade options and ours sounded so much better.

If you would like to know more about how we could improve your car audio please feel free to call in at the shop on Sunderland Street in Macclesfield, Cheshire or call me for a chat on 01625 432707.

apple play car setup pixabay

Apple Car Play

With the spectacular rise of the Smartphone, integration into the car has always been an obvious way forward. Once they started holding music and had access to the web the need to carry bulky CDs around was over. One small hand held device could provide all your music as well as communication needs.

Over time storage capacities have dramatically increased and access to streaming services like Spotify have put the world’s music at our fingertips. Most now have navigation apps that are updated in real time making them accurate and up to date. All this makes the smartphone an ideal addition to the vehicle environment; the trick is how to integrate it safely.

At Car and Home Stereo, we have been installing hands-free Bluetooth telephone kits for many years. A popular choice is still the Parrot CK3100. This simple device allows for hands-free telephone calls and the neat screen lets you see who is calling and also to allow access to your contacts list.

I can’t begin to imagine how many of these we have fitted over the years! With the new penalties for picking up a mobile phone in a car, this should be a minimum requirement if you do not already have Bluetooth capability.

Another highly desirable facility in the car is satellite navigation and smartphones are usually equipped with this capability. There are many companies supplying brackets and cradles for smartphones that can stick to the windscreen or attach to the dash. These are quite legal as long as they do not obstruct the driver’s vision, I have seen them stuck to the middle of the windscreen before now and that is a definite no-no!

installation of sat nav with smartphone car home and stereo macclesfield

This is a better installation but it does mean the screen is quite low.

Of course, all these solutions require something attached to the dash and associated wires to connect. It can get quite untidy and may still mean you have to operate some functions from your ‘phone. A much better solution would be if your car audio system could perform all the functions you need without the need for multiple external devices. There have been several unsuccessful attempts to do this over the years all with good intentions but ultimately let down by poor software and terrible compatibility issues. Unfortunately, open source development means systems cannot be tested for all configurations and operational incompatibilities are inevitable.

Step up Apple Car Play. Only available for iPhone 5 and above this system is the best system we have seen so far.

apple play iphone 5 car setup

I don’t want to get into the iPhone versus Android debate, I know that each system has its pros and cons but for vehicle integration Apple Car play is definitely the most stable. This is simply because Apple have developed it specifically for one operating system and it can be thoroughly tested before release, it may not be perfect but it works every time without the need for the user to download and install drivers and patches.

So what does it do?

Put simply, it puts all of the relevant iPhone apps on your new car radio touch screen and works exactly like your ‘phone so you already know how to use it. There are several units available that offer Apple Car Play but let’s look at one of my favourites the Pioneer SPH DA120.

Even without an iPhone connected the DA120 is a powerful machine with full Bluetooth streaming and hands-free, dual USB, AUX, AM/FM tuner, HDMI and multiple connections for amplifiers, reverse camera and other AV devices. The 6.2-inch capacitive touchscreen is a joy to use and of course, the quality of sound from this unit is superb as you would expect from Pioneer.

However, the full power of the DA120 is unleashed as soon as you connect your iPhone and Car Play is launched. Immediately the screen changes to mimic the ‘phone screen and displays the relevant icons and this is the beauty of Car Play, you already know how to use it. Tapping the phone icon launches SIRI and you can speak the name of whoever you wish to call. Alternatively, all your ‘phone contacts are available exactly as stored. Incoming messages are read out to you and you can dictate a reply or create a new message from the messages icon. The quality of the voice calling using the supplied external mic is extremely clear even in convertible cars.

The music icon, of course, launches your media player and if you subscribe to Spotify then that icon would be available as well. Although the DA120 has an FM/AM tuner, if you want to use internet radio then one of the radio player apps like Tune In Radio can be enabled.

The icing on the cake:

So far so good but the icing on the cake is the navigation icon. This launches Apple Maps and turns your unit into a full satellite navigation system. You may have noticed from the picture of the rear of the SPH DA120 that it is equipped with a GPS aerial. This means it is not reliant on the ‘phone’s receiver and hence allows for more accurate positioning. Since Apple Maps traffic information is updated in real time getting stuck in jams could be avoided.

All of this can be accessed using SIRI, so with just a touch of a button you can access your contacts, dictate messages, request music or get directions. This makes a complex system very easy and safe to use.

This system can be fitted to any car that permits a double din fitting and we have all the necessary installation kits to allow a neat and seamless integration to your dashboard. If your car has controls on the steering wheel for volume and other functions we can ensure that these remain active, we will also ensure that any changes we make can be reversed if the car is sold to return it to standard.

If you would like to know more about Apple Car Play or any other aspect of improving your existing car audio system please give us a call on 01625 432707 or better still call into the shop on Sunderland Street, Macclesfield, Cheshire we would love to see you.

Life In The Loud Lane

At Car and Home Stereo we are dedicated to getting the best possible sound in your car. We will carefully match your needs to the best equipment and electronics to achieve that goal. We have access to a vast range of products so that we can tailor a system that is perfectly suited to you and your car. Of course what everyone wants is different and two extremes were both in the workshop at the same time recently.

If you have read the Lotus Evora blog you will know that the emphasis was on a stealthy install with the aim to produce a highly detailed soundstage. This was achieved with a full Audison system using the amazing AP8.9 Bit amplifier, Voce speakers and Prima sub, a simple system boasting 520W, more than enough power for the small cabin of the Evora. The final tuned sound of this car was fantastic. The music was surrounding with detail and punch where it needed it.

In the adjacent workshop bay at the same time was a Vauxhall Astra van and the brief for this one was very different. This had to sound good but most importantly it needed the ability to crush you with bass! Being a van we had plenty of space to work with but on the down side all that metal was a prime candidate for epic vibration. Power supply was always going to be an issue from the standard battery and of course with the power we were going to need, the standard wiring would not be adequate.

How we did it:

The first job would be to strip the vehicle for acoustic treatment. Every panel had to be coated to make sure all the enormous energy of the subs was retained inside. There’s no point in installing a 3000W system if 1000W gets out, it might sound good to passers-by but if you’ve paid for all that power, you want to hear it all. Once treated, tapping on any metal panel sounded like tapping on wood. There was no resonance and as a bonus road noise was reduced to almost nothing. The doors were treated with more Dynamat Xtreme to improve the acoustic response of the front speakers and again reduce road noise.

What next?:

The power supply was upgraded with two auxiliary Optima yellow top, deep cycle batteries with a split charge system. Even though the MTX bass amps are ‘D’ class they still draw a significant current and it was important to make sure this would not drain the vehicle battery. This kind of power has to be made safe and that means fuses on each battery and on each supply to the amplifiers, there may only be 12 Volts but the current capacity on the Optima batteries is more than enough to melt any cable and incorrect fusing could cause a fire if short circuited.

Once the power supply was installed we could mount the amps on the forward bulkhead. As this was destined for the show scene we made sure that everything was as neat as could be.

The eagle eyed of you will spot the cut outs for the MTX 6×9 speakers below the amps. This is an unconventional position for speakers as they are behind the seats but they will add a much needed boost to the low mid-range to complement the component speakers in the doors.

The three main amps are MTX RT1000.1Ds, These develop 1000W each at 2 Ohms which is why they need 50mm sq. power cable! The rest of the speakers are powered by a JL Audio XD400/4 and everything is kept under control by the Audison Bit 10. The front speakers were mounted in the standard location on custom collars and the tweeters were mounted into custom ‘A’ pillar pods.

This improved the staging for the front and solved the problem of the size of the tweeter being too large for the factory location.

So what about the subs I hear you cry!

Well this had to be the show stopper so we knew we would have to build something a bit special. The MTX TX612 is a beast of a sub.

With its awesome power handling capability we knew we could really push this speaker. It has incredible excursion and that red, double stitched hinge is not just for show. We wanted to get the most from this driver so we opted for an optimised slot ported enclosure, one for each sub. As you can imagine there is a significant amount of weight here so we also had to make sure that there was no possibility that any of this structure could move. Safety is always prominent in our minds when designing any system.

This is the finished enclosure although there will be trimmed wheel arch boxes either side for storage.

The auxiliary batteries and fuses are located behind the enclosure and are accessible by removing the top trim panel. There will be a voltage display mounted in the right hand arch box so battery condition can be monitored. The main fuse and Stinger 500A peak split charge relay are mounted in the bonnet with the vehicle battery.

Did we fulfil our brief?

And then some! With the tailgate open the bass completely dominates and you can feel the sound waves pushing your chest. If you dare to put your head inside the boot you’re immediately disorientated by the sound pressure level. When sat in the front you can hear the rest of the music as well and now that awesome bass complements rather than overpowers. Of course there is a level control for the bass but the temptation is to turn it up for the biggest smiles!

At Car and Home Stereo we know that this sort of system is not for everyone and we always ensure you get exactly what you need so regardless of what vehicle please give us a call and we can start your journey to a better sound.


Stealth Installation: Audi Edition

At Car and Home Stereo, we have been installing high-performance audio for over 40 years now. As I’ve said before we have seen a continuous change in vehicles, equipment, and technology but one very noticeable change has been the drive to take up less space. Amplifiers have shrunk in size and subwoofers can operate in smaller enclosures, the ‘stealth’ install if you like.

I can clearly remember the 1990s when there were queues of Golf GTis waiting for subs and amps. One of our popular installs would be a Phoenix Gold Ti 600 amp and a pair of JL Audio 15w3 subs, what a sound! Of course, it filled the boot space and you couldn’t lift the sub box to get to the spare wheel but who cared when you could feel the bass right through to your bones.

It is true to say that these days our customers are more reluctant to sacrifice all their boot to amplifiers and speakers and as I said earlier, manufacturers have been working hard to reduce sizes without compromising performance but sometimes it’s nice to install a proper ‘muscle’ system and recently  I did just that in an Audi, let me take you through it.

The vehicle is an Audi S3 with the B&O sound system. The owner was reasonably happy with the front speakers but was completely disappointed with the bass performance. When we sat in it together the first thing I noticed was the huge gap in the midrange, quite an achievement considering there are 10 speakers, and of course, the sub bass was nonexistent. Looking in the boot we found the B&O ‘sub’ which was no more than a 6-inch paper cone speaker in a plastic box, awful! The Audi speakers are heavy, low sensitivity drivers which is why the midrange was so poor. So what should we do?

We wanted bass, lots of bass, so the obvious choice was the magnificent JL Audio 12w6 or rather two of them.

This is easily one of my favourite speakers of all time with masses of punch but with a sensitivity to play the fastest of bass lines cleanly.

Of course a sub like that wants lots of power and the perfect match is the JL Audio XD1000/1v2, one for each sub.

With 1000W on tap, this amplifier certainly has the drive but it also boasts a high damping factor to help keep control over that 12-inch cone. When a speaker is played loud the cone has to move a large distance, the 12w6 has a peak to peak maximum excursion of nearly 40mm! That cone builds up a lot of inertia and it is down to the amplifier to keep that under control. Damping factor could be considered to be the brakes of the system and without good brakes, the cone is just going to flop forwards and backward leading to a loose bass performance. It is the damping factor that helps keep everything tight and punchy.

I couldn’t allow this level of bass performance to be added to the car without dealing with the front end which I felt was completely inadequate. Nothing crazy. Just a simple front speaker upgrade with a 4 channel XD amplifier to power it. We settled on the super smooth JL Audio C5 650 component set and the XD 400/4v2 to power them. By using a 4 channel amp I could run the mids and tweeters fully active to eliminate the passive crossovers.

The next challenge is how to connect our system to the factory head unit. The Audi, like many other modern cars, uses the fiber optic MOST system to deliver audio from the entertainment and vehicle alerts to the amplifier. In order to retain this audio feed, we have to retain the B&O amplifier. The trouble, of course, is that the amplifier performance is hopeless. If  I connected my new amplifiers to the audio output of the B&O the sound would be almost as bad as before. Fortunately, we now have an arsenal of tools from JL Audio to remedy this. The simple but powerful FiX automatic processors and the incredible TwK audio processor.

The FiX processor is designed to connect directly to the factory amplifier speaker outputs. It can determine the issues in that speaker feed and automatically correct them. It is capable of accepting multi channel inputs and creating a pair of high quality pre amp outputs, it can even detect phase and time delayed signals and correct them.

With this connected to the B&O we now had a very clean audio feed that retained all of the vehicle and entertainment information and in reality we could have just connected this feed to our new system, but we weren’t finished yet! This system needed to be amazing so step up the JL Audio TwK88. This small but powerful device allows me to create virtually any system configuration I want. I have full control over every aspect of the the audio spectrum, I can control frequency, phase, time correction, equalisation and level. Every output can be fine tuned for the absolute best sound possible so I can take account of annomolies in the sound stage.

Although we left the rear speakers as standard they are faded almost completely off but they are adding a small amount of presence to the rear seats. The small mids in the door and the centre dash speaker have been disconnected as they only muddied the sound which is now wonderful. The sound stage is high and clear, right across the dashboard, the mid range has returned and the bass can go from subtle to armageddon!

So what does all this look like?

Even Henry looks impressed!

Once the boot floor cover goes back none of the electronics are on show, the sub box moves into the load space and surprisingly there is quite a lot of room left. Certainly enough for the shopping.

This system is massively impressive, it might not suit everyone from a size point of view but the sound quality would blow you away.

If you would like to know more about how Car and Home Stereo can improve the sound in your car please call me on 01625 432707 or better still call into the shop on Sunderland Street in Macclesfield.


Time for a New Lifestyle

The amazing Bose Lifestyle 650

Car and Home Stereo have been supplying exceptional Bose music and home theatre systems for over 20 years. I still remember the first time the original Acoustimass speaker cubes were demonstrated to me. Tiny speakers that twisted with a sound that seemed to fill the room, very impressive.

From that day we have stayed with Bose as the ‘Home’ in Car and Home Stereo. Some of the most exciting products have been the Lifestyle range of home cinema systems and over the years we have seen continuous and dramatic advances in technology and performance.

The core design feature of the Lifestyle systems has always been amazing, immersive sound from almost invisible speakers. The latest version, the Sound Touch Lifestyle 650 takes this to another level. Let’s take a tour of the technology and features of this incredible home cinema system.


The speaker system is revolutionary. The diminutive OmniJewel speaker houses two drivers positioned at the top and bottom with the sound radiating from the central grille.


This allows for complete 360-degree dispersal and creates a huge image stage all around the speaker. If the speaker is wall mounted then the reflected sound adds to the widened soundstage. The result when all five speakers are connected is a truly immersive sound with exceptional image separation, perfect for movies. To make installation easier the rear speakers have a wireless connection to the control unit meaning no more wires to chase around the room.

Of course no cinema system is complete without the woofer. This is what creates the power and excitement in the soundtrack.



The Acoustimass 300 bass unit

From the cutaway, you can see how the driver is positioned under the sleek glass top for maximum dispersion without rattling the floorboards. The tuned port below the speaker enhances the truly deep tones perfect for when the star destroyer thunders across the sky! Again the woofer connection is wireless meaning it can be positioned anywhere and just needs a power point.

But what if your room is an odd shape making it difficult to install the speakers in the ideal positions? Maybe you have high ceilings and wood floors which can produce odd reflections and ruin the sound. Well, Bose has the answer in their AdaptIQ system. This learns the layout of your room and listening positions and automatically adjusts the sound to compensate for anomalies. This means that every system will sound as good as the showroom and you will not need to carefully position your speakers to optimise performance.

Finally, we come to the gorgeous console.

The sleek Sound Touch 650 console

Available in black or white this sleek, glass topped unit is the brain of the whole system and packs an amazing suite of features and technology. It is designed to be the hub of your entire audiovisual system. There are multiple HDMI ports to accept all your devices such as Sky, Virgin, Blu-Ray player and others. There is a single ARC equipped HDMI port for connection to your television but if your TV does not have ARC then there is a dedicated optical port for the TV sound. The smart Bose remote control can be programmed to operate all your other devices which means a lot less clutter on the coffee table!

That takes care of all your video needs but what about your music? Well, the Lifestyle 650 is equipped with Bluetooth for direct streaming of music from your phone or tablet but more importantly, it has the Bose Sound Touch wireless music system on board. This simple system links the Lifestyle to your wifi network and any connected devices. This means it can see your iTunes or My Music library on your computer or network drive giving you instant access to all your music. If you have a Spotify or Deezer account you can access that from the Bose control app on your smart device and play it through the Lifestyle system. There is also internet radio access giving you just about every radio station in the world in digital clarity.

All this technology is incredibly easy to control either via the Bose Sound Touch app or the system remote control which I think is important as we shouldn’t feel intimidated by an overly complex control system. You barely need to look at the instructions as it is so intuitive to use, the system even talks you through the installation making sure no mistakes are made during setup all thanks to the Unify installation process. System updates are automatic via your wifi connection meaning your system will always be up to date and upgraded as necessary.

And there is so much more to the Lifestyle system that makes it one of the best home cinema systems available today, far too much to talk about here. I would urge you to call in for a demonstration so that you can experience the full power of this magnificent range.


Gain An Advantage: Amplifier

Anyone who has dabbled in car audio will have come across an amplifier at some point. They come in many shapes, sizes, and outputs but from the cheapest eBay special to eye wateringly expensive European exotica they all have one purpose, to get the musical signal to the speakers. The amplifier is, therefore, sat between the CD player and the speakers accepting the low-level input signal and converting it to a high power speaker output. I don’t want to get too bogged down in technicalities but let’s discuss the different types available and the controls we are given.

The JL Audio RD900.5 is a perfect example. This 5 channel, D class amplifier is capable of running a complete car audio system with front speakers, rear speakers, and a subwoofer. Alternatively, it could run a pair of front speakers bridged for enormous power plus a subwoofer once again. So, the RD900.5 is a very high performance, a flexible amplifier with a pretty small footprint making it easy to install.

The input stage is on the far left of this amplifier and comprises the usual red and white RCA connectors. There are 3 pairs that equate to the front, rear and sub input. Above these are three switches that allow for hi or low-level input, auto turn on mode and input channel selection (2, 4 or 6). Not all amplifiers are equipped with these selectors but these add to the RD900.5 flexibility.

The next stage is what interests us here, the frequency filter and the gain controls. The RD 900.5 is nonsymmetrical meaning that all channels are not identical. Channels 1 to 4 are for main speakers while 5 and 6 are for subwoofers. Therefore there is a variable high pass filter for 1 to 4 and a low pass filter for 5 and 6.

What is the filter for you ask? It is used to remove frequencies that are not required by the speaker on that channel. If we know we have a subwoofer fitted then it makes no sense to send the very low frequencies to the door speakers. Sub frequencies require a speaker cone to move a great distance and most door speakers simply cannot achieve this without distortion, I’m sure you have all heard a speaker trying too hard causing the classic ‘burping’ sound. In extreme cases, the speaker coil can be heard crashing into the back plate creating a clapping noise. Either situation is undesirable so to prevent these from occurring the frequency filter is applied to restrict the low tones.

The cutoff frequency is variable to suit different speakers and installations and setting it correctly requires the use of a signal generator. If you do not have access to one of these then it is possible to do roughly by ear, simply play music and slowly raise the filter frequency until there are no very low sounds in the speaker. The result will be a much clearer sound with no distortion. The mid definition should be greatly improved meaning vocals will cut through better. Typically the filter control is graduated and a very rough initial setting for a typical door speaker would be around 80Hz but you should experiment either side of this to find the best setting.

The subwoofer (low-pass) filter is the opposite of the high pass filter as it removes the higher frequencies sent to the sub. This ensures it only gets useful frequencies and we do not waste amplifier energy trying to make it play the higher tones.

Again the cutoff frequency is variable but what we want is to blend the sub with the main speakers so it is important to find a filter point that complements the high pass filter for the speakers.

So now we come to the input sensitivity, perhaps one of the most misunderstood controls. First and foremost it is not a volume control. Sure, it does increase the volume as you turn it but that does not mean it is increasing the amplifier power. Let’s consider what an amplifier is doing, it is taking a small signal and making it bigger. That signal is very dynamic meaning it is made up of loud and quiet parts, an extreme example could be Tchaikovsky’s 1812 Overture. Not something we listen to every day but it serves our example very well. If you are not familiar with the piece it starts very quietly and builds to a crescendo of orchestra and cannons. A more modern piece would be Warriors Dance by Prodigy but with fewer cannons!

The most important thing to consider when setting the sensitivity is that the amplifier only has a finite amount of power, let’s say 100Watts. That is represented by the upper dotted line on the graphs above. Our goal is to get the maximum, undistorted output.

If we look at a typical input sound wave it is obvious that there are loud and quiet parts. As we stated the amplifier is there to make this signal louder. Now let’s add the maximum amplifier power to the input signal graph.

As we increase the sensitivity we increase the size of the input signal at the input stage to the amplifier and remember there is a finite amount of power available. So what happens if we go too far?

As can be seen the nice smooth curves at the top and bottom of the loud spikes have been flattened which is clipped distortion. So yes we have a loud sound but it will be fuzzy and unpleasant. It will also damage speakers as the flat tops of the wave are a DC signal that will only induce heat into the voice coils. So if we take our example, the 1812 Overture, with the sensitivity set as above the quiet passages will sound good but the loud sections will be badly distorted and this will get worse the louder we play it.

For the best sound and maximum output, it is imperative that the loudest sounds are not clipped. Normally this would be set up with an oscilloscope but it can also be done with a voltmeter by measuring the output for maximum unclipped voltage as long as you know the true output power.

Fortunately, the JL Audio RD amplifiers have a brilliant feature, a clip indicator. This will light up if the signal is distorted by over ambitious sensitivity meaning setting up is made much easier.

At Car and Home Stereo, we want all our installations to give the best possible sound and that is why we carefully set up each and every one.

If you would like to have your system checked for any problems and to find solutions to these we would love to measure your car using our state of the art test equipment. These can highlight deficiencies in the sound stage that are difficult to locate just by listening.

As usual, I have run out of space so I’ll leave amplifier types and their best application for another time. But please don’t hesitate to call on 01625 432707 if you have any questions.

Demonstration of Distortion

An interesting situation occurred at Car and Home Stereo recently that I would like to share. It highlighted a phenomenon that is quite counter intuitive and led to some interesting discussions.

We have a demonstration Land Rover Discovery that has a simple, high quality audio system installed that is tuned to perfectly suit the interior acoustics. We always encourage our customers to sit in and experience it as it shows what can really be done with car audio. The amplifier that powers the system is the magnificent Audison 5.1K which develops a true 1650 Watts.

There is one pair of component Hertz Mille Legend speakers in the front doors and a Hertz Mille subwoofer in the rear.

A customer recently auditioned the system and we spent a good hour playing different types of music with a view to producing something similar in his car. He was completely blown away with the sound, couldn’t believe the clarity and how the sub blended perfectly with the whole system. And then he said ‘I love it, but it’s not very loud is it?’. In fact he reckoned his standard Ford system was louder!

Now I know just how loud our system is and the odd thing is that the cleaner the sound the less we perceive volume. Since we had some time I decided to run a little proof experiment with my customer’s car.

As part of our equipment set we have an industry standard spectrum analyser which is also equipped with an SPL meter. It was a simple task to set this up in the Discovery first and then the Ford to compare. As expected our Discovery hit 126dB easily, the Ford however struggled to hit 110dB. In real world terms this equates to a perceived doubling of power (a true doubling is 3dB but we don’t really hear it that way). The next test was the distortion level. By plugging an oscilloscope into the amplifier output we can measure the clipping levels. Unsurprisingly the Discovery registered less than 5 percent distortion at full volume as this was how it was set up. However the Ford reached 5 percent at a little over half volume and climbed to over 25 percent.

There is no arguing with the figures so what is going on? Simply that the higher  distortion levels were being registered as unpleasantly loud and our brains are trying to get us to turn it down! Distortion is the quickest way to destroy a speaker or indeed your hearing.

At Car an Home Stereo we value our customers and hope to be providing high quality audio systems for many years. A distorted sound system will very quickly do serious harm to our hearing and that is why we only choose the best equipment and like to carefully set these up to give the best possible sound. Brands such as JL Audio, Audison, Hertz and Dynamat may not be the cheapest but certainly are amongst the best. The fact that when installed correctly they can deliver an amazing sound makes them excellent value for money.

As to my customer with the Ford, he now has a fabulous system based around a JL Audio amp and speakers with a Rainbow active sub. He loves to play it loud and I know it will give him years of pleasure without doing any harm.

If you want to experience the Discovery sound system or would like to discuss how we can improve your car please all us on 01625 432707.

What To Look Forward To In 2017

It’s good to be back after the festive break and there is a lot to look forward to in 2017.

World renowned audio manufacturer Audison have just announced their new Thesis speaker range. The Thesis amplifier represents the absolute pinnacle of performance without compromise and now there is a speaker set available to match. If you are looking for the absolute best possible sound then this is it.

adison speakers

Staying with Audison, the new slimline Prima subwoofers and enclosures offer stunning bass performance from a very compact form. These will appeal to anyone who does not want to sacrifice much boot space but still demands a Hi-Fi response.

audison prima subwoofers


There will also be a new Prima Pack custom installation kit for the BMW 1 series. This car has always had a very disappointing standard audio system and the Prima Pack is a tailored solution comprising the stunning AP amplifier, a custom Prima speaker pack and compact subwoofer. As with all the Prima Pack systems the factory head unit remains unchanged but the audio performance is greatly enhanced by the AP amplifier. The speakers fit perfectly into the factory locations and the sub is designed to blend seamlessly with the factory trim.

bmw1 car

On the other side of the Atlantic, JL Audio have released their amazing new processors, the new Fix and TwK.

jl audio

The FiX range is simplicity itself to use and automatically deals with all the anomalies inherent in vehicle factory head units. Building on the success of the CleanSweep processor, the FiX can automatically de-equalise audio streams and can even remove spurious time alignment errors giving  a flatter, more open sound from which we can build a better audio system.

The new TwK processors take this a huge step further by allowing access to a vast range of processors via the JL Audio software. From input/output configuration to full spectrum equalisation, this product means that every installation can be tuned to perfection.

Over the break we have been busy building new demonstration stands to showcase some of our best car audio equipment as well as tweaking our Land Rover Discovery demonstrator. This simple car audio system still astonishes me with its clarity and power showing what can be achieved with just one pair of speakers, a subwoofer and amplifier. If you haven’t heard it and can come down to our shop on Sunderland Street in Macclesfield I would encourage you to do so, it is sure to impress.

Our focus, as ever is on installation of the highest quality whether it is a simple dash cam or a full blown custom audio system. We are proud to be a part of the national FourMasters group offering the highest installation standards and a three year warranty on installations.

Please feel free to pop in or give me a call on 01625 432707 to discuss ideas and start your journey towards better sound!

Wishing you a happy new year!

We hope your 2017 has got off to a good start!

Here, at Car and Home Stereo we already have some exciting, new products coming through the door. Come to our shop on Sunderland Street, Macclesfield, and see what we can do for you.

Pitch Perfect – Rainbow’s Profi Line

Here at Car & Home Stereo Macclesfield, we’ve fallen head over heels for the Profi brand.


Uncompromisingly brilliant, these incredible pieces of equipment embody the precision and passion of real expert craftsmanship. The sound is so crystal clear, that you feel as though you’re at a live performance. Our resident car audio system expert and musician Tim described the sound as ‘utterly transparent’, and when you hear what these speakers can do when installed with precision – you understand why.



We’ll be honest, Profi line is not the cheapest way to get your hands on an audio system for your car. However if you want the best possible quality of sound, we think the Profi kit is worth every single penny. In common with all high end car sound systems, proper installation is vital to getting the quality of sound that you’ve paid for. Here at Car & Home Stereo of Macclesfield, we have a trained musician and qualified sound engineer with a passion for crafting perfect audio environments. Tim Campling offers a bespoke and comprehensive instillation service, tailoring each of his creations to the requirements of your vehicle and sound system – achieving perfect harmony between the two.



Our doors on Sunderland Street, in the Heart of Macclesfield, are always open – so if you’d like to come by for a chat, look or a listen – make sure to pop in!

We look forward to seeing you.