Originally Posted by steveting99
It depends on the room and what type of speakers/subs one has.
In your instance the Def Tech BP8080ST
has powered subs. According to NRC measurements, there is a +8dB hump from 100Hz down to 30Hz giving that satisfactory in room low frequency feeling, that 12" woofer is powered by the 455W built-in Class D plate amp. These speakers are effectively a combination of great bookshelves + powered subs. Most passive floor standers are not like the BP8080ST. A completely passive 3-way floor stander would require significant amp power to produce the same low frequency bass signals at the same SPL and distortion levels. Though the 95dB THD at 50Hz looks a bit off.
The other unique thing about the BP8080ST is the dumb bell shaped figure 8 sound dispersion pattern. If you've got the back reflections taken care of, there is no ceiling and wall reflections to worry about so the direct sound waves will reach the ears first before secondary/tertiary reflections. This aids in better imaging.
An in room measurement should be able to confirm the above.
I don't disagree that my situation with this particular system may be different from others (I presented it as an extreme example), but I feel that to say one should always set their speakers to "small" is misleading, at best. I have 5 other systems with Yamaha AVRs from 5 to 11 channels (all with more conventional speakers) and as I previously said, I find it best to set the sizes according to the actual response capabilities of the speakers. I've not run into power problems (significant or even noticeable distortion) with this approach yet.
1) JVC DLA-NX7 & Sony 65Z9D, Yamaha CX-A5200, Outlaw Audio 7900 & 7700, UDP-203, DP-UB9000, UBP-X800M2, Roku Ultra
2) Sony 75Z9D, Yamaha RX-A3080, 2xOutlaw Audio 2200s, UDP-203, UBP-X800M2, Roku Ultra
3) Sony 75X940E, Yamaha RX-A2080, UDP-203, UBP-X800M2, Roku Ultra