Down 3db at 100khz or 300khz is insignifcant. Down 3db is good in that it is designed to reduce oscilation tendencies. At what power is the amp rated at, what is the power output at max or rated power vs. Frequency response and distortion. Measure all at 1wpc and full smoke. Key is the square wave at 10hz. If it deforms, notches or rounds off investigate. I have seen highly rated 100wpc monoblocks that roll off 10db at 20khz, and roll down15db at 50hz. And the square wave was rounding severely at 60hz. They were also voted "best of show".....likely not the product consumers get. I never liked the sound myself of the consumer product. A soft bass confirmed with a bench test, revealed a compromised product. Quality transformers are found with music reference, Quicksilver, EAR, conrad johnson, ARC, and others, but there is junk out there as well....beware jallen
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.
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.