How can a subwoofer expand the soundstage?

"I thought its because the subwoofer is omnidirectional in the lower region and thus adds to and expands the soundstage that the conventional speakers, whose sonic signature is directional, can't possibly convey."

Omni=directional speakers apply this same concept and resulting sonic effects to higher frequencies as well.

Dbphd,

Thanks for your feedback. This is valuable info for me, as I ponder over the value of adding an external crossover before the amp. Would appreciate your thoughts on this.

I run B&W 804s, which are said to have a frequency response down to 38Hz -3dB and while B&W doesn't publish distortion figures I believe they probably increase distortion quite a bit at the lower frequencies...maybe under 50 Hz?. I also have a REL Storm III, which as noted doesn't like being crossed over much higher than 50 Hz...therefore I wonder if getting an external crossover, like a Bryston 10B, to let the B&Ws reproduce only freuqencies above say 50Hz is worth it. Unfortunately I live in a place where buying used and giving it a try is not easy...Any thoughts?

Sorry I'm way off topic!

Lewinskih01,

If you can find an external crossover on Audiogon at a reasonable price, I'd give it a try. But if your B & Ws are down 3 dB at 38 Hz, they presumably start rolling off before that, and your REL could roll off before 50 Hz, so there may be little effective overlap. The actual LF frequency response of your B & Ws will depend on how you've located them in your room, particularly in regards to rear and side walls. I wouldn't rely on achieving the manufacturer's 38 Hz value in your home.

db