Originally Posted by Steve Bruzonsky
All of this begs a few questions using at minimum 4 subwoofers in 4 places with my Trinnov Altitude 32 (24 channels) for my ongoing home theater upgraderemodel, as I am considering perhaps selling my 2 JL Audio f212 and 2 Paradigm Persona subwoofers and perhaps getting 4 of the JTR dual 18" subwoofers, with of course Trinnov Master Calibrator Adam Pelz coming out to do his setup/calibration magic and probably adding a QSC Q-Sys Core 100f to the mix for easier subwoofer setup/calibration (My revised/renovated dedicated theater will be 18'3" wide, 23'4" long, 12' high, with component racks and disc storage hidden at the very rear with cabinetry/shelves):
1. Generally, using the same 4 subwoofers either at the 4 room corners, at the quarter points of opposing walls, or at the mid points of all 4 walls, after PEQ and room correction/optimization by a top pro like Adam or Curt, etc, will one method of placement sound better, different, more musical, deeper for movies, etc than another? Or after PEQ and room correction/optimization, will the sonics be hard to distinguish?
2. Ported vs non-ported subwoofers. Cannga mentions his high regard for a JTR 2400 ported subwoofer. Can ported subwoofers be designed to be as "quick", musical and disappearing as non-ported subwoofers? E.G., in the JTR subwoofer line, how do ported vs non-ported subwoofers compare in this regard. (I realize many folks here are not that much into music, movies only, but I and some others use our systems for both music and movies.)
I hope that some of my JTR friends will forgive me if I try to answer some of your questions.
If you are going to have a professional calibrator help you with your system, then he can also help to determine the best location for the subwoofers. And, that may take some experimentation with different placement options. The best location is somewhat room dependent, vis-a-vis listening positions dependent, and can't always be determined in advance. If your build depends on your ability to select subwoofer placement in advance, then I would consult the calibrator who is going to have to dial-in your final frequency response, and get his advice on subwoofer placement.
The answer to your first question just involves some experimentation. The answer to your second question is more complicated than that. You haven't said exactly why you want to upgrade from your current subs, but I assume you are chasing more significant low-bass effects. Even a pair of Cap 2400's would have much
more low-frequency SPL and TR (tactile response) than your current four subs have. Any good subwoofer can sound good with music, but some subwoofers are more noticeable than others, so when you speak of the four Cap 2400's "disappearing", I have some concern.
Too me, it's not so much that large, powerful ported subwoofers can't be as quick as sealed subs, it is more the fact that they produce so much more low-frequency SPL and
TR than you are currently used to. That will add to the perception of bass weight, compared to the subs you currently have. The big ported JTR subs are often described as violent, and I think that is a valid description. Would you like that deep-bass SPL and TR violence for movies? I absolutely think that you would. Would the four large ported subwoofers blend or disappear in the same way that your current subs do for music? I'm not as sure.
You obviously have a lot of money invested in your current subs, and will be investing quite a bit in your new ones as well. If I were you, I wouldn't do that without some auditions. One way would be to try to find someone in your area with large ported subwoofers who would be willing to let you listen to some of your music with them. A better way would be to order some ported subwoofers, from a couple of different sources, to test them in your own room before jumping all-in with an order for four subs.
For instance, I might order one JTR Cap2400 and one Rythmik FV25HP, or one Rythmik FV18. Test both of the subs you are auditioning for both movies and music. If both give you the right combination of blending for music, and the deep-bass and TR that you are looking for with movies, then multiples of that sub will do the same thing, on an even larger scale. If one sub seems better to you for movies and the other seems better for music, then you will have a choice to make. And, it's a choice that only you can
For the amount of investment involved, and with your obvious financial resources, I would do this if I were you. Going from a sealed subwoofer to a really powerful ported sub can be an eye-opening experience. Going to four of them all at once will be even more so. Of course, you could also consider buying a single sealed JTR sub to test. All current JTR subs are maximized for strong low-frequency performance. And, the sealed JTR subs will be more potent in that respect than your current subs are. Four RS1's, or especially four RS2's, would give you very significant bass capabilities, even in a roughly 5100^3 room.
My best advice is to find a way to audition some ported subs so that you can answer your second question to your own satisfaction. If you do, I have no doubt that you will end-up with a terrific sound system. Meanwhile, reading Section VIII of the Guide, linked in my signature, may be of some benefit.