Originally Posted by cel4145
Some receivers are grossly over-rated in their marketing materials; some not. Check out the test measurements for these twoDenon 1612Pioneer VSX-1012
This looks good and matters:
"This graph shows that the VSX-1021’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 106.3 watts and 1 percent distortion at 136.4 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 119 watts and 1 percent distortion at 168.1 watts.
This looks bad, but doesn't matter:
Five channels driven continuously into 8-ohm loads:
0.1% distortion at 46.1 watts
1% distortion at 56.7 watts
Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 44.5 watts
1% distortion at 53.7 watts"
Your complaint is justified by the following from Pioneer's spec sheet:
120W x 7 (1 kHz, THD 0.05% @ 8 ohms)
90W x 7 (20 Hz – 20 kHz, THD 0.08% @ 8 ohms FTC)
It don't do that! Pioneer does not seem to be telling the truth!
The good news is that it will never ever even have to try.
If you want to spend money for capacity that is guaranteed to sit on figurative bench for the life of the receiver, be my guest!
If you want to express angst on AVS over it, I'm going to try to cheer you up with the relevant real world facts. ;-)
Most of the power in a surround system goes to the front 2 or 3 speakers, but if you don't buy that, there is a more compelling story to follow. While the 45 or so wpc capacity looks bad on paper, its only 3 dB down with continuous sine waves.But here is the critical point:
Like I keep saying here over and over again, (and can demonstrate on the drop of a hat) music has at the very worst less than 1/3-1/2 the power of sine waves.
Often the ratio is as much as 10:1!
In the real world, if you drive any receiver with music peaking at digtial FS on all 7 channels simultaneously, all 5-7 outputs will clip north
of what it does into just 2 channels on the test bench with sine waves.
The difference in the power in sine waves versus music makes up the difference. Actually, its not the fact that the signal is music that is the root cause of this - this happens with any signal that isn't a pure sine wave. You don't even have to factor in the transient and impulsive nature of music. You get the benefit even with hypercompressed and clipped music. All that audiophile rhetoric about listening to music and not sine waves applies.
Where's the beef, except on paper?