Joe Peeps
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Ok, so I stumbled across this thread by 12 volt King and did some maths…
http://forums.justcommodores.com.au/showthread.php?t=14914&highlight=amp+power+ratings
My Audiobahn 4002T amp is rated as producing 400 RMS bridged across the 2 channels.
It has a 40amp fuse, so Applying the relevant formula,
Power = 40 x 14.4
= 576 RMS at 100% efficiency
400/576 = 69.4% efficiency required to produce the touted power.
Correct me if I’m wrong, but I read somewhere that the theoretical max efficiency of a class A/B amp is 66% i.e. this amp can never reach the advertised level of power.
Leaving aside that +/- 50wRMS is no big deal in real terms, and that differences will always occur during manufacture, I have a real problem with the advertising of ratings that are physically impossible and can never be attained.
Before I fire off an abusive email demanding my money back (I bought the amp before I found this and other forums) have I overlooked any important info? Otherwise id be left looking quite the fool….
Cheers
http://forums.justcommodores.com.au/showthread.php?t=14914&highlight=amp+power+ratings
My Audiobahn 4002T amp is rated as producing 400 RMS bridged across the 2 channels.
It has a 40amp fuse, so Applying the relevant formula,
Power = 40 x 14.4
= 576 RMS at 100% efficiency
400/576 = 69.4% efficiency required to produce the touted power.
Correct me if I’m wrong, but I read somewhere that the theoretical max efficiency of a class A/B amp is 66% i.e. this amp can never reach the advertised level of power.
Leaving aside that +/- 50wRMS is no big deal in real terms, and that differences will always occur during manufacture, I have a real problem with the advertising of ratings that are physically impossible and can never be attained.
Before I fire off an abusive email demanding my money back (I bought the amp before I found this and other forums) have I overlooked any important info? Otherwise id be left looking quite the fool….
Cheers