Amplifiers: The heart of the car audio system.

In its basic form an amplifier has one job, to take a small signal and make it bigger.


This would be so easy if music looked like the above sin wave but of course music is much more complex.

Music is a complex mix of multiple frequencies with varying levels and shapes. Sin waves, square waves, saw tooth waves all layered to create sophisticated patterns of vibrations in the air. Astonishingly our ears can pick up these complex and subtle vibrations and our brains can interpret these signals at a very precise level and let us experience music. Consider listening to a large orchestra. Even when all the instruments are playing it is possible for our ears to detect just one small part rather than a wall of noise. Composers know this and carefully layer instruments to create symphonic masterpieces.

How a speaker can reproduce this is for another discussion but let us consider the amplifier.

The signal coming from the CD player should contain an accurate version of the music at a very low level. I say ‘should’ because a lot of standard fit head units actually do not have a clean signal and this has to be dealt with before it gets to the amplifier but again that is for another discussion. So let’s assume there is an accurate signal leaving the CD player which contains all the subtle nuances of the music.

What happens inside that big box?

As I said earlier, the small signals from the CD player have to be made larger so the speakers can play them but as I also mentioned these signals are extremely complex. Recreating these complex signals requires some very sophisticated circuitry but above all very high quality electronic components.

So what is it you get when buying a better amplifier?

I like to use the analogy of standard, high, and ultra high definition TV. If you have experienced all three types then you know the difference. Standard definition is OK and is, for most purposes good enough. However high definition is sharper and clearer so no fuzziness around the edges making it easier to watch. Ultra high definition takes it to another level and quite honestly it’s pretty much like looking through a window with vibrant and subtle colours, crystal clear images with no flicker or artefacts. You could describe it as just like the real thing and this makes it much less fatiguing to watch as your brain does not have to compensate for the poor image.

Music is exactly the same, the more accurately it is reproduced the less your brain has to compensate for distortion or missing information. This compensation is what causes listening fatigue and can lead to headaches and the desire to turn the system off!

A better amplifier will be able to reproduce every last nuance and detail of the music and you can quickly tell the difference when you hear it. You will notice things in the music that you have never heard before; instruments will be clear and well defined without any muddiness when there is a lot of information playing. Vocals will be lifelike even allowing you to hear the space they were recorded in exactly as the artist intended. This is what a really good amplifier can do for you and why it is always worth spending more to get a better sound.

Someone once told me a good way to describe better and better sound was to think of the artist playing behind layers of curtains, each time you improve the system you remove a curtain until eventually you are standing in front of them.

So what does it take to get right to the front?

The Audison Thesis Venti amplifier. Over £8000 of sonic perfection for two channels. If you want the best then here it is.

If you would like to know more about how we can improve the sound in your car please call us on 01625 432707 or pop into our shop on Sunderland Street in Macclesfield.


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