Originally Posted by corchid
Ummm...M Code I understand the logic concerning your impression of output power of avr's....they are limited by their power supply....BUT the output transistors themselves can limit power output, so an avr that may be able to output let's say 220 watts into 8 ohms with 2 channels can output more than 220 watts total into all channels driven. If the avr tests on a bench to output 70 watts per channel in that senario would put total output at 490 watts with 7 channels driven would disprove your hypothesis about 2 channel power vs all channels driven. I can prove links to several test bench articles if you would like...
The output transistors (1 pair) for each channel of amplification are capable of outputting 100W per channel or 700W total for 7 channels...
And the limiting factor is the power supply not
the output transistors.....
channels driven part, the traditional procedure for measuring output power was for each
channel to be driven to rated
output power according to the original FTC amplifier statue.....
However in todays mass market driven by Panasonic, Bose, Sony they have revised
channels driven from rated
output power to 1/8th
power output, so instead of each channel putting out 100W it puts out 12.5W... Note that none
of the magazines or test labs drive ALL
channels to rated output power, the advertising department now decides the published power output specs and in many, many instances they are never even verified.... The big box sellers like Best Buy, Amazon, Walmart largely influence what power output specs are published..
Since HK was one of our clients for several years, we were directly involved with the design/development/validation/delivery of the mentioned AVRs and we actually have the original electrical measurements done by the design team from prototype to mass production. So we know exactly what their output capabilities are....
Note that HK is actually more conservative then certain other AVR brands, but due to recession and increased sales pressure from the big box sellers they too have begun to play the game of stretched
, output power specs..
Just my $0.05... 👍😉