Hey guys - I'd appreciate some input. I think I might be making some things more complicated and expensive than it needs to be. I'm trying to spec a set of subs for my in-progress HT space. I'm still building - no riser or stage or soffits yet - no door either - but I want to get my sub system up and running so that I can integrate some modal control features and maybe placement into the design before I get all my finishes and woodwork bought and installed. I've built with decoupled framing (room-within-a-room) including the ceiling atop my poured concrete foundation, green glue, three layers of wall board (OSB, 5/8Drywall, 5/8Drywall) on standard 16" centers.
My room is medium-small at a volume of about 2000-2300 cubic feet - 12x22x9 or so. I would be glad if I could get to reference down to below 20Hz, but I'm a little flexible on the extension; maybe not so flexible on the output.
I have already built a set of three Cheap Thrills
for LCR, and I'll build something else for surrounds. I'll be doing all the setup and calibration myself and would like to keep everything sealed in hopes of improving my success in calibration as well as ultimate extension. I'm not quite set on integration and setup theories for multiple subs, but reference output and minimal seat-to-seat variation are central design goals, so I was thinking a MiniDSP or maybe some kind of BFD and four or more subs. I prefer rack-mounted amplification and have as much as 2 20-Amp circuits I can dedicate to them, in a closet outside the room, so fan noise is not an issue.
What is an issue is space. 6 seats in the room will eat up a lot of real estate, so a small footprint would be best. I can fit a couple boxes behind my screen wall, but I figure at least two will need to be out in the room. And of course, the budget is always an issue. I'm sure I could go buy a handful of orbit shifters or something and make it work, but I live in world with limited funds, like most of the DIYers I'm sure.
My initial plans were to start with 2 CHT SS-18s and add more later, but at this point I'd rather get four integrated properly from the beginning while the budget is still flowing and I haven't gotten used to a particular system - strike once, strike hard, no mercy Sir! ya know? Now I'm hoping that I can get it done with 15s or a mix of 18s hidden and 12s or 15s out in the room. I'm a noob to some of this (really all of it, though I've done a lot of research) so I'm not sure what I can expect from these sorts of designs and what it'll really take to get me 115dB with a respectable amount of THD in a room of this size.
Would you buy two stereo amps and give one channel to each sub? Would you just buy one amp and wire them all together, using only one channel of EQ? What's the reliable way to get to my goals with minimal size and expense? Anyone have a setup they think would fit the bill? Am I silly to think a sealed system is the way to go?
Thanks for your feedback, in advance.