Subwoofers that do both L/R & LFE simultaneously?

Just my opinion of course, but adding two more (mechanical) electrical connections and another pair of speaker cables between my amp and my main speakers just doesn't say "high end audio" to me. It's OK for a modest HT system, but at best a compromised result for 2-channel audio.

Nsgarch,

Then you misunderstand how a REL is connected at speaker-level.

With the REL, the sub is connected in parallel with the main speakers. It presents such a high impedence (100K Ohms, I believe) that it doesn't significantly affect the impedence "seen" by the amplifer. The speakers and the sub are both connected to the speaker terminals on the amp.

Nrenter, what you describe is technically the same circuit as I describe (except tied together at the amp instead of at the sub) And it's a little better, yes, for the same reason bi-wiring can be. But with the scheme you describe, you could really be buying lots of speaker cable!

Either way, the sub is sampling the amp output through a filter circuit of it's own. I guess that's OK, but being the stickler for cleanliness and simplicity that I am, I insist the sub have its own direct line-level feed out of the preamp.

Audio Concepts makes two models, The Force and The Titan,
that have all the inputs that you mention. www.audioc.com

REL Strata III have another advantage in the sense that they are sealed enclosures which integrates well with any speaker in the chain. I use it with the LS3/5a as well as Kef Reference Two, both totally different speakers yet the REL seamlessly integrates with both and sounds superb.

I reviewed it earlier at A'gon for those who like to read it:

http://forum.audiogon.com/cgi-bin/fr.pl?rspkr&1087163673&openfrom&1&4#1