I'm halfway through a learning/experimentation stage regarding subwoofers. Not too long ago I was proud of myself for rewiring my old subs directly to a Crown XTi-1000 and creating my own parametric EQ curves. Then I started swapping out drivers and my world changed for the better. AT that point, maybe a month ago, I came back to AVS looking for ideas. So many incredible projects on this site, I'm blown away.
Since I live in downtown Philly, I do not have the space to build a dedicated home theater. Anybody who's seen a Philly rowhouse knows, space is limited compared to a modern suburban home. So, IB is not an option and LLT, as appealing as it sounds, would burst my room at the seams, because I'm already hosting a pain of dual 15" mains with huge horns.
For the last month I've been messing with smaller tuned boxes as well as sealed subs. Nothing among those options made me truly happy, and then I decided on a whim to try out a dipole sub. I knocked the rear wall out of a small sub enclosure and put it front and center in my system, about 1/3 the distance from the speakers to the listener, precisely centered.... and it turns out that's the sound I've been looking for. KISS at work. Today the back comes off my larger box which contains the Polk MOMO
15". It should blow away the test sub from last night -a 10" polk driver taken from a PSW-125 and put into a .box from a $99 Sony sub.... and yet those junk parts managed to sound so good... so damned good I'm ready to commit to this approach. The little 10" dug deeper and was more on-time and any ported or sealed sub I've messed with, limited only by its diminutive size and inability to play LFE effects from blu-ray without bottoming out - time for much, much more displacement. I need the best possible impulse response for mastering my tracks, and I can deal with monitoring at moderate volumes... if the reproduction is faithful and full-range. Dipole did all that.
I'll see what I can do about pictures and graphs. This isn't the 'real' sub I'm envisioning ending up with, just an experimental staring point. I think the key here was deciding what kind of bass sound I like. I can't get enough of that box-less sound, it's appeal to me was immediate and obvious. I'm curious how the MOMO
will do in this application. It voids the warranty to use it IB style, but it really seems well-suited to the application. Gotta run and get some carbide blades and cut my box open now...