Originally Posted by HDTVAV
The most expensive part in a receiver is the power supply. So in many ways it is the most important part.
Once you try to exceed the maximum power output either the sound quality degrades or the receiver will
go into protection and turn off. Some brands put the specs of the power supply on the website or in the pdf
brochure. Yamaha knows their power supply's are small compared to the competition so they hide the specs.
You have to download the manual and go back to the specifications area. At the end of that is the general area.
That is where the total power (supply size) is listed. Not all these watts are available for the sound output. Some
of this is used for the display, hdmi board and everything else. The rest (about 2/3 to 3/4) of the total watts are
for powering the speakers. Except for the A5000 Yamaha only uses three power supply's.
490 watts(3030,2030,1030) 400 watts (830 down to 675) and 270 watts (575 and below).
The higher end denon and Marantz use about 670/700 watt power supply's and the 4311/4520 use 780 watt
power supply's. When powering speakers near maximum performance these numbers matter. This doesn't
apply so much with receivers with class d amps like pioneer sc models. They don't need as big of power supply.
Here are bench tests of the 3 levels of Yamaha and the total power output difference (approximate #'s).
High level (490 watts)
Mid level (400 watts)
Low level (270 watts)
The size of the power supply has a direct effect on maximum watts per channel 5 or 7 channels driven
and the actual cost of manufacture. Compacitors are cheap. Dacs are even cheaper.
Check out the specs of the denon 4520. 780 watt power supply. 60% more total power than the 3030.
These numbers are also on the back of every receiver.
Another quick check shows my upa-7 external amplifier has a 1700 watt power supply and the xpa-5
has a 1800 watt power supply. Mega power.Edited by kikkenit2 - 2/27/14 at 4:26pm