Alright guys, I didn't realize how my reply's I would get.
Anyways, I didn't have any SPL meter or anything so I did the best I could make the volumes exactly the same (again, I did this by ear).
I set both receivers to stereo mode, cross over was both at 80hz, everything was EXACTLY the same. I made sure bass treble and everything was at 0db. Don't think that I am bias'ed toward Harman Kardon because before this test I thought Onkyo receivers were a lot better than harman kardon.
I don't know what to tell you guys but from what I heard, the harman kardon receiver had a lot more power than the 805. Some of you say that if i dont have any measurements it is not credible but based on what I heard, the harman kardon really out did the onkyo.
The following are the problems I perceived from your findings:
1. The 354 weighs almost 30 lbs lighter (31.5 vs 50.9).
2. If you look through the top of the casing, the 354 has a fair size transformer but not any bigger than a similarly priced Yamaha and I don't know where they hide those big caps that you could clearly see inside other receivers by Onkyo, Yamaha, Denon.
If size/weight doesn’t count, fair enough, but look at one lab measurements:
http://www.homecinemachoice.com/pdfs/HCC/152/HCC_152_054.pdf
Onkyo 805
175W (2 channels driven, 8Ω,
0.5% THD)
281W (2 channels driven, 4Ω,
0.5% THD)
146W (5 channels driven, 8Ω,
0.5% THD)
207W (5 channels driven, 4Ω,
0.5% THD,)
Fidelity firewall: 162W
(0.05% THD, 8Ω, 1kHz)
THD @ 50W: 0.0018% THD
(1kHz, 8Ω)
Frequency response: 20Hz-
20kHz +/- 0.06dB
http://www.homecinemachoice.com/pdfs/HCC/124/076_HCC_124.pdf
HK 635 (almost 10 lbs heavier than the 354, 41 vs 31.5)
Measured power @ 1kHz
2ch driven: 110W into 8Ω
5ch driven: 90W into 8Ω
2ch driven: 160W into 4Ω
5ch driven: 125W into 4Ω
Fidelity firewall @ 1kHz/2ch
100W: into 8Ω (0.05%THD)
Distortion @ 1kHz
0.02%THD @ 50W (8Ω)
Frequency response
20Hz-20kHz +/-0.2dB
So not only by specs., even by lab measured data, the Onkyo beat the 354's older but bigger brother by a significant margin in terms of real power output.
So your findings, if true, it defies science/engineering. I for one do not believe too much in published specs and that's why I always try searching out those lab measurements in order to add credibility to manufacturer's published specs. I have no problem believing a 20WX2 Luxman amp can out perform a 90WX7 Yamaha but that 20W amp weighs almost 50 lbs and listed for $5K whereas the HK AVR-354 does not seem to have caps big enough to be visible from the outside.
One other thing, if your main objective is to compare the power outputs of the two receivers, it is futile to certain extent to test in Stereo mode and crossover at 80 Hz. I am sure you know the reason. Try doing another level match test in pure direct to make the speakers are getting full range linearly amplified signal and you may get different results.
I am sorry for not taking your initial post too seriously. I blame Seth, laugh can be contagious.
