For example:
Onkyo TX-NR828 Receiver This receiver claims that it produces
160Watts @ 0.7Thdhowever upon closer review we see that this is with only
2-Channels driven Simultaneously. So exactly how much power
are you getting when driving All-Channels Simultaneously?
In this case
Sound & Vision Magazine did a Test Bench and
shows you just how much power your really getting to those speakers.
5 Channels Continuously Driven, 8 ohm loads (.1 THD) 109.9 watts
7 Channels Continuously Driven, 8 ohm loads (.1 THD) 78.5 wattsThat's a loss of over
80 Watts per channel.
This is why it's so important to understanding Tech-Specs
Look for companies that test
ALL-CHANNELS DRIVEN such as Emotiva & Axiom
which make some of the finest Power-Amps anywhere for amazing prices.
Sources:
http://www.onkyousa.com/Products/model.php?m=TX-NR828&class=Receiver&source=prodClasshttp://www.soundandvision.com/content/onkyo-tx-nr828-av-receiver-test-bench [img:center]
http://www.soundandvision.com/images/styles/600_wide/public/913onkrec.prmo__0.jpg?itok=IEBRcf8l[/img]