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Bandwidth question?

I am interested in the qualitative difference in sound betw amplifiers that have -3db roll off at 100khz vs -3db at 300khz. Thru the amps I have tried, I suspect increased bandwidth has more openness and transparency and hence a better sense of space sharing. At the same time, it is easier to screw up the sound due to noise (from components/AC/RF) or improper cartridge loading. I am not very certain of the correlation and interested in what you guys think?

In reviewing the measurement sections of stereophile, many amps with -3db at 100khz demonstrate subtle rounding of the edges when reproducing 10khz square waves. I don't listen to square wave so I don't know what that translate into.

I realize that some amps (Spectral or Soulutions) has very high bandwidth (MegaHz) to implement negative feedabck. I am not refering to that.
128x128glai

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glai OP
446 posts
 
Many thanks for all the responses. To be specific, I am not interested in debating the human hearing bandwidth. Mine is 25hz to 17khz.

I am interested in the how the ultrasonic bandwidth impacts the reproduction of audible frequencies. Many responses have pointed out phase issues, noises (or ultrasonic noise modifying how a component behaves in the audible freqs.)These are very helpful to me. I also realize that bandwidth for amp is dependent on load and output.

Ralph,

Why 10 times the audbile bandwidth is neccessary. A lot of amps are -3db at 100khz. This means faithful playback up to only 10khz, if you are correct.
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