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In Reply to: Re: But why haven't ENGINEERS come up with a revealing TEST posted by BBeck on July 7, 2006 at 11:52:40:
BBeck,Good references.
I have been a Member of the AES for years and agree that there have been many methods of measuring different types of distortion in amplifiers. Measuring THD by itself is just a joke. It's easy to do but totally insufficient to see what an amplifier is really doing to the input signal.
A method that (nearly?) anyone can do is that used by Walker of QUAD fame. He used a passive network that had the same passive characteristics (frequency and phase response) as the DUT. The difference in the signals emerging from the network and from the DUT is the distortion of the DUT of every kind. By listening to the difference you will hear only the distortion products plus any residual of the input signal due to the inaccuracy of the network emulation of the DUT. The input signal can and should be music or whatever you want.Maybe I could find a reference but it would take much rummaging. Maybe Googling will come up with something about the Walker method. I think it never made it to the JAES. Worth a try to find. I think the method might have been the work of Walker and Albinson(?) both of QUAD.
Bill
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Follow Ups
- Re: But why haven't ENGINEERS come up with a revealing TEST - pickle 08:39:00 07/08/06 (1)
- Re: But why haven't ENGINEERS come up with a revealing TEST - BBeck 09:09:27 07/08/06 (0)
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