Amplifiers, newbie is confused !! (Off Topic)

by GC, Tuesday, March 29, 2005, 14:27 (6960 days ago) @ GC

Dear Jacobus,

Welcome to the confusing audio world which in fact is much less confusing when you stop reading hifi-magazines...

If you take Amplifier 'X' and Amplifier 'Y' which both have the
specification as mentioned above (or better) they sound the same. At
least, that is what I would expect.

No they don't sound the same. To make it more confusing, the minimum spec's mentioned are true from mid-fi to high-end so there must be something else that makes the sound....

In other words, only knowing specifications is the least interesting information you need to know...

So, here is my question; Is it indeed true that from a HiFi point of view
an Amplifier should produced sound according to the above specification,
to keep everything as natural and clean as possible?? I mean, how is it
possible that I read often in reviews that e.g. amp 'Z' has a warm sound,
a solid bass etc etc, and that why it is better than amp 'W' I mean, an
amp should not alter the music and make it more warm with more bass than
is actually recorded? or am I wrong?

An amplifier reacts on the load (the speakers). Technical perfect amplifiers will show their character the same on all speakers. These amplifiers are not bothered by capacitive loads, impedance variations and feedback through the speakers. Sounds cool but such amplifiers (if they exist) mostly sound the least musical, almost digital.

Less perfect amplifiers are more bothered by signals coming from the speakers (working like microphones) which can be cured with electronical feedback (creating higher damping figures). This technique also controls the speakers more (the ones that need it) giving a more tight and controlled bass (less "warm" sounding). Most modern amps use this technique but it reduces the musicality of the original signal.

Power is another thing that most people do not understand. Most people think that a 30W amp (more power) is better than a 15W amp. The only difference related to power is that the 30W amp is capable to provide only 3dB more gain before it starts to clip. 3dB is just a little bit louder.

How much power you'll need depends on the volume of your listening room, how loud you want to play and the sensitivity of the speaker (simplified explanation). A 15Watt amp with 90dB speakers plays just as loud as a 30W with 87dB sensitivity if the load (impedance) is the same.

Distortion is only important if you can hear it, human ears are not bothered at all when the distortion is 1% or even more at lower frequencies. It is also the type of harmonic distortion (1st order, 2nd order, etc.) that makes the difference.

I could go on and on but the best way to know which amplifier is the best for your system depends on your system in which it will be connected. The "best" amp, the "best" source, the "best" speakers and the "best" cables all together will not sound like the "best" at all.

All parts should match or compliment the other. Like red wine that goes with steak but hardly with cake...

Sorry for being even more confusing...

Ciao,

Bert

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