Power amp phase response
 

"Stewart Pinkerton" wrote in message
...
On Mon, 13 Dec 2004 23:27:18 +0200, "Iain M Churches"
wrote:

I would be interested to know the phase response
of a high end SS amp (OK, I know, they are ALL high end:-)
at 20Hz and say 20kHz, or more points if the info is
available.

It obviously depends on the bandwidth of the amp, which doesn't have
much to do with 'high end' credentials. A Naim amp for instance is
specifically designed to have limited bandwidth, and will have phase
angles of around 10-20 degrees at 20Hz and 20-30 degrees at 20kHz. At
the other extreme, a Spectral will have phase angles of less than five
degrees at these frequencies. My own Audiolab 8000P measures about 5-7
degrees at 20Hz and 8-10 degrees at 20kHz (approximated due to being
measured on a 'scope, since I don't have a vector voltmeter). The
Krell is about the same. Some SS amps are DC coupled, which will give
them zero phase angle at 20Hz.


Can you confirm that these figs are accurate?
I ask this because a chap who writes the technical column
for an audio magazine is interested to write article about
phase response, and I want to make sure that any data
I give him is 100% correct. I am sure he will give you a
mention. Fame at last:-))

TIA

Iain