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Original Message
RE: The definition
Posted by Ralph on June 26, 2012 at 11:08:31:
What you are talking about with the Pass is not headroom. It is simply the amount of 'A' power as opposed to 'AB' power.
The idea with headroom is that the amp can make more power than rated for a brief period of time. So it favors amplifiers with weak power supplies and class AB or B operation.