Originally Posted by tbird8450
Maybe I'll give them a shot, thanks.
Is there anyone here who has owned/heard both the 805 and 818 and could comment about their comparative sound quality?
I've read comments saying that the 805's amp section is beefier (most of these seem older, though. Maybe pre-release speculation?), while many others say that the 818 sounds better, particularly for music...with and without Audyssey. What's the real scoop?
Since the thread was revived...
OP, look at the weight differences between the Select and Ultra certified Onkyos (ignoring the 806, which probably should have been Select2 instead of U2). The difference is in the power supply and heat sinking. And mostly, that difference will only show up in sustained high power output or if you have speakers with difficult impedance loads. If you don't drive the receiver into clipping, they'll sound the same...ignoring differences between Audyssey implementations. For a given speaker, you need to double the power for a 3dB increase in output and coincidentally, 3dB is the smallest difference the average human can reliably detect between complex audio under laboratory conditions. I couldn't easily find a benchmark test of the 818, but the 828 should be the same or very similar. Into 4 ohms, the 828 tested at 110x5@8ohms where the 805 did 162x5@8ohms...both at .1% distortion. 7 channel testing was similar at 78 vs. 120 wpc. IOW, the maximum output difference using the same set of speakers would be in the 1dB range. But, the 805 could probably maintain its output much longer before going into protection. Note, all channels driven is not a condition that happens on real world content..
And if you're still shopping, remember Onkyo has their own refurb outlet (ShopOnkyo.com) along with accessories4less being an Onkyo certified refurb vendor. The above mentioned x4000 can be had for ~$900 as a refurb while the Onkyo 1010 (THX U2) is listed for $1050 when in stock.