Originally Posted by Red99
Originally Posted by Done Deal DR
I know this is an SVS subwoofer thread, but being that I have the same RF-7 II front stage as CC I thought I'd chime in. While the high frequency horn section in the RF-7 II's is incredibly efficient, the dual 10's are much more demanding. Low frequencies will spike down to around 3.2 ohms as well. Getting solid bass out of these speakers requires solid power. I'm currently providing mine in stereo around 120-125W per speaker with a Pioneer Elite class D receiver, replacing a much less capable receiver. The difference in that power difference was night and day in the bass response... and while I have yet to personally get an external amp, I've heard from many posters that the jump from similar power I'm at now to quality 300W+ external amplification is also night and day. Based on my experience, I have no reason to doubt that.
I've heard KEF LS50's at more than one audio show, IMO they are more musical than RF-7 II's but don't hold a candle to the theater experience RF-7 II's provide. It also absolutely requires a subwoofer, where as the RF-7 II's are capable of playing a stereo source quite well by themselves. It's a much difference experience for vastly different market segments, but I don't understand ragging on RF-7 II's like they are $50 generic China speakers when you're (edit, sorry didn't mean you in particular as you don't own them) dealing with a good but still quite limited speaker. In absolute context, the RF-7 II's are much more capable than the LS50's. Now if I were to be putting together a somewhat near field 2.1 channel stereo music-only system, yeah I'd get the KEF's.
You would only need a lot of power with the RF7's if you listen to very loud SPL or have a extremely large room and you are sitting a good ways away. Most of the time my RF7-II's are only using a couple watts according to the power scale meter on my McIntosh. I'm running just 100 watts x 6 out of my amp and its plenty of power. Now if I wanted to listen at like 120 dB, then I would need more power. Which I can bridge my amp to run 320 watts x 3. But I am not into concert level volumes anymore.
Another thing you have to consider is most if not all AVR's advertised RMS power rating is only at 1 channel. Even though they may say 140 watts x 7, they cant deliver 140 watts to all channels at the same time. But most of your separate amps can. So that could possible be the reason of the night and day difference in going to a separate amp.
Of course, the power ratings I gave however are tested measurements from a magazine review on my receiver, Sound and Vision. 2 channels at 8ohms. The Pioneer class D's hold up very well in actual measurements:
Two channels driven continuously into 8-ohm loads:
0.1% distortion at 127.2 watts
1% distortion at 150.3 watts
Five channels driven continuously into 8-ohm loads:
0.1% distortion at 109.0 watts
1% distortion at 127.7 watts
Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 99.4 watts
1% distortion at 110.3 watts
It's easily able to hit reference levels, which obviously can't be tolerated in my room. -10 is plenty loud for most all movies. While I know even a few watts will power them to very loud levels, I obviously know that my previous receiver was capable of outputting far more than 3 watts and yet... Still a huge increase in bass performance. Perhaps more than anything it's the ohm drop, and while my current AVR is rated for 4ohms, I think that perhaps that's an area for improvement in a quality external amp.