I think someone has posted something similar before, but for convenience let me do it again anyway.
The following information are from H.T. mag Dec 2004 (Pioneer), Aug 2004 (HK & Denon, same reviewer). Some of the published results are quite consistent with those published by other British AV magazines.
Pioneer 52TX, consumption=630 VA, or 480W (implying power factor=480/630=0.762)
Note that neither Pioneer nor Denon explicity tell us their power consumption numbers are maximum, typical, average, continuous, short time rated, or whatever. We can make all kinds of assumption but strictly speaking we do not know for sure what the basis are.
5X115.3 @ 0.1%, 5X129.7 @ 1% into 8 ohms
2X121.2 @ 0.1%, 2X143.1 @ 1% into 8 ohms
2X197.0 @ 0.1%, 2X231.4 @ 1% into 4 ohms
Denon 3805, consumption=852 VA (7.1AX120V)
Assuming power factor=0.8, consumption=680W approx.
5X114.9 @ 0.1%, 5X125.0 @ 1% into 8 ohms
2X132.2 @ 0.1%, 2X162.3 @ 1% into 8 ohms
2X218.4 @ 0.1%, 2X243.0 @ 1% into 4 ohms
HK 630, consumption=1040W (specified as maximum)
Note that Denon/Pioneer does not state their consumption as maximum explicitly.
5X79.7 @ 0.1%, 5X93.3.0 @ 1% into 8 ohms
2X84.6 @ 0.1%, 2X100.6 @ 1% into 8 ohms
2X146.9 @ 0.1%, 2X170.8 @ 1% into 4 ohms
HK330, consumption=890W (same as the 230, 235 and is specified as maximum)
No H.T. mag test data for the HKAVR330, but according to S&V Mar 2004
http://www.soundandvisionmag.com/assets/download/322004163324.pdf
1X95W @ clipping, 1 KHz into 8 ohms
1X148W @ clipping, 1 kHz into 4 ohms
2X86W @ clipping, 1 kHz into 8 ohms
2X25W @ clipping, 1 kHz into 4 ohms
Note that when both channel driven into 4 ohms, the 330 activated its protection mode after 0.5 sec if it was asked to produce more than 25W.
So based on the HT mag/S&V lab measurements, you can guess whether you can get more power if you run less channels. To me, you can't just take those power consumption numbers to the bank. Also, it would appear that the HK receivers may have higher losses, e.g., the AVR330 consumes 118W even at idle. No doubt their power consumption numbers are impressively high as pointed out by Buckeyefan1
BuckeyeFan1,
The HKAVR235's 890W power consumption may or may not be a continuous rating. They call it "maximum". And aren't you happy to see that despite HK's often emphasized "high current capability" (they do specify it as an "instantaneous" rating only), the Denon actually does better than the AVR630 in power into both 8 ohms and 4 ohms.
The only HK models the 3805 cannot beat are the 7200/7300. Those are just monsters, and there is nothing our 3805s can do about it.