Can anyone tell me what the terms dBc and dBu mean, in the context of distortion and noise performance in audio amplifiers? Would dBu mean dBmicrowatt? Many thanks, Fraser G4BJM -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm