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Split the LFE signal???

319 Views 2 Replies 3 Participants Last post by David600, Dec 6, 2000

reaper

Discussion Starter · Dec 5, 2000

The def tech setup I plan on getting will consist of 5 speakers all containing an LFE input.

Fronts: BP2004TL

Center: CLR 2500

Rears : BP2006TL

Should I send the LFE signal to all the speakers, only the fronts or only the fronts and the rears? I am thinking of sending it to the fronts and rears and not the center. But I am confused. The last issue of Home Theater Magazine described a setup consisting of 4 BP2006TLs. The reviewer ran LFE to all 4 speakers but not the center 2300. I asked (via e-mail) HT about this and they recommended not sending LFE to the rears even though they so gushingly recommended it in their magazine. I also e-mailed Def tech and they recommended against it as well. What do you guys think? LFE to fronts only? Or bass all 'round?

Here's the response I got from Def Tech:

"I would only split the LFE signal once. (so both front speakers can receive the LFE signal) I'd then set the center and rear speakers to "large" on your receiver. Then they'll get all the bass that the center and rears would normally get. (This can still be a good amount of bass.)"

Here's the response I got from Home Theater Mag:

"Their response is good advice. Using more than one LFE speaker can be good for cancelling room modes, if you know what you're doing. If not, you can end up with an incoherent mess as each sub cancels the others out. I'd start out with one LFE channel, then add a second. You'll have to readjust the LFE output with each additional sub. You can try additional subs, but will likely find the results to be questionable. See Russ Herschelmann's article on using 3 subs in

the October Stereophile's Guide to Home Theater."

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Buzz Goddard

· #2 · Dec 5, 2000

It's a bit of a crapshoot. Ity depends on your room and where the speakers are placed within the room. The tricky part is that the LF response will be uneven. On some stuff it will sound great, on others it won't. Short of fairly sophisticated test equipment, you need to spend hours and hours of disciplined testing to figure out the right configuration for multiple subs.

In the majority of rooms, the best sub placement is in the corner.

------------------

Buzz Goddard
www.tagmclarenaudio.com

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David600

· #3 · Dec 6, 2000

hi

I would set the mains in LARGE and the sub getting the LFE + the bass from the mains ( I like this set up on the DENON ).

Ideally, the center speaker should be set to large, like in theaters ( cinemas usually have front and center set to large, high cut at 30hz, subs getting LFE,crossover at 100hz, surrounds in small cut at 100hz).

if your mains, center and subs are aligned, you probably won't have cancellation, on the contrary. Provided the room is long enough however, to allow low frequencies wavelengths to fully travel the room.

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