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Friend of the Shack
1,356 Posts
Hello everyone!

First off, thanks again to everyone for the replies to my first thread on hometheatershack. You guys rock!
Hi Jason, and glad to hear you're having a good time!

So, first question - is there any truth to what I was reading? Will sending stereo signals to a left and right sonosub sound better than a mono signal to a single sonosub?
Well, Mike is right in his response to your post. The sub output is, by definition, a mono signal (that's the ".1" of the "5.1" or "7.1"). You could send L/R full range signals to the subs, and apply LPF somewhere (some subs have it built in, or you could do it with a BFD (BFD is the Behringer Feedback Destroyer, the primary weapon of choice here at the HTS for sub EQ) or other external crossover), or you could run dual mono subs.

Quality would just depend on the setup. For example, two bad subs wouldn't stack up agains one good sub. Two great subs might just give you more output. Some people believe that using two non-co-located subs causes more problems and that you should simply co-locate them to get the extra SPL benefit. Some people believe that using two non-co-located subs smoothes the frequency response. I used to use three subs (two each built in to my mains, and a stand alone sub in the corner), and I got good results. Nowadays, I'm using full-range mains (no built-in subs) in conjunction with a huge IB sub, with good results. Both were somewhat meticulously EQd with REW and a BFD. Anyway, the point is that there's no clear answer, and you'll have to listen, measure and test for yourself! I believe that either way, you will be able to get stunning results with a little work.

I'll need a stereo amp to power them, such as a behringer ep2500. How easy (or difficult) are pro-amps to hook up to a HT setup? Will I need any other equipment or can you just connect the amp to the receiver and the subs to the amp like you can with a dedicated subwoofer amp like the dayton amplifiers from PE?
To connect a "normal" RCA to the EP2500 isn't hard, but you'll need a connector that has RCA on one end and XLR on the other. If your preamp/receiver has balanced outputs, you can use that to feed the EP2500 directly. Or, if you are using a BFD to EQ your sub's output signal, you can go balanced from the BFD directly to the EP2500. In any case, it's not hard to do, and the part(s) you need can easily be found (probably around $10 at RS or PartsExpress/Monoprice).

What do I do (if anything) about a low pass and a high pass subsonic crossover (or whatever it's called that filters out those nasty low low frequencies)? Don't forget that I'm a total HT newbie when it comes to pro amps!
Well, your preamp/receiver will most likely do the crossovers for you. The (mono) sub signal at the sub output jack should already be crossed over at whatever frequency you specify. Even if you were using an off-the-shelf sub or sub amp that has a built-in crossover, you should disable that built-in crossover, and opt to use the one that's implemented in your preamp/receiver. Now, if you choose to implement stereo subs using full-range main L/R signals, then yes, you will have to apply a low pass filter yourself. I'm doing this myself using some of the filters available in the BFD, and it works just fine. Admittedly, this is a more complicated path, and if you decide to go that route, post up your questions, and I'm sure we can get you going. There are also a bunch of other active, external crossovers available from Behringer and others...

Hope that helps! Good luck!
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