haraldo
Active Member
Was there any discussion of phase shift in amplifiers, isn't this a major and neglegcted issue?
Is it the mainstream idea that whatever happens in an amplifier above 20KHz is of no interest?
According to a whitepaper I read by Cyril Hammer at Soulution Audio, he states following:
- an amplifier with a bandwidth of 20 KHz (-3dB) has a phaseshift of 45 ° at 20 KHz, very audible.....
- an amplifier with a bandwidth of 200 KHz (-3dB) has a phaseshift of 6 ° at 20 KHz, audible
- an amplifier with a bandwidth of 2MHz (-3dB) has a phaseshift of 1 ° at 20 KHz, not audible
There must be a reason why Soulution settles for an bandwidth in their amplifier boards of 30 MHz (according to Mr. hammer) and that they aim for 2 MHz bandwidth for their best poweramps, to my ears in general, the ultra high bandwith amps like Soulution 511 is just plain better... I never heard the CH Precision, Audionet, Goldmund amps that I believe all of them are extremely high bandwidth... more products that follow these lines
I don't remember seeing any serious scientific talks on these things in forums ....
Maybe I haven't looked well enough around
Is it the mainstream idea that whatever happens in an amplifier above 20KHz is of no interest?
According to a whitepaper I read by Cyril Hammer at Soulution Audio, he states following:
- an amplifier with a bandwidth of 20 KHz (-3dB) has a phaseshift of 45 ° at 20 KHz, very audible.....
- an amplifier with a bandwidth of 200 KHz (-3dB) has a phaseshift of 6 ° at 20 KHz, audible
- an amplifier with a bandwidth of 2MHz (-3dB) has a phaseshift of 1 ° at 20 KHz, not audible
There must be a reason why Soulution settles for an bandwidth in their amplifier boards of 30 MHz (according to Mr. hammer) and that they aim for 2 MHz bandwidth for their best poweramps, to my ears in general, the ultra high bandwith amps like Soulution 511 is just plain better... I never heard the CH Precision, Audionet, Goldmund amps that I believe all of them are extremely high bandwidth... more products that follow these lines
I don't remember seeing any serious scientific talks on these things in forums ....
Maybe I haven't looked well enough around
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