Well, hello all, if anyone could tell me what the formula is for calculating 
amplifier headroom.  I have 2 amplifiers here with well, almost tolerable 
headroom of 1.5 DB, which is not much i know.  I have seen specs on QSC, 
Crown, ASHLY, Carver, Bryston, NAD, Harmon Kardon that had headrooms from 2 
DB all the way up to 5.7 DB.  The amplifiers I have are rated at 1200 watts 
and 3400 watts.  Out of the 1200 watt amplifier i measured 360 watts per 
channel with both channels driven when the amp was rated for 250 watts per 
channel into 8 ohms.  360 over the 250 watt rating into 8 ohms, hmmm.  The 
other amplifier i have here is rated for 3400 watts.  A year ago i measured 
2925 watts out of it total very near to clipping, and recently i replaced the 
line cords with 14 guage instead of 16 guage and i remeasured with the same 
test and same impedance i got 1650 watts per channel into its rated 4 ohms 
instead of the manufacturers 1200 watts per channel into 4 ohms per channel, 
both channels driven at once.  I used a 100 HZ tone to test my amplifiers, 
and very high temperature Alpine subwoofers.  Now, is there a way of 
calculating headroom?
Laszlo Sokolai
Team ANTI-Windows95/PRO-OS2/PRO-Unix
lsokolai@bbs42.com
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