Originally Posted by BigJake82
Here's a few I loaded up in WinISD real quick. I did everything in 4cuft boxes, single for the Fi HT-3 and SI HST-18. Dual for the UM18's and Fi HT-1's. Everything modeled with 2kw. UM18's are dual 2 ohm so you won't get 2kw from your XLS2002, you would have to get a different amp setup for those to get 1kw ea. They are mostly there for comparison purposes, you could run one off your XLS though if you wanted. You run into the same problem with the HO18 seeing as they are 4 ohm. UM18's would get 650w each from the XLS2002. These aren't your only options, lots of good 18's out there.
Build any of these in 22" cubes and they will only be marginally larger then your Rythmiks, 5" width, 1.5" height.
Here's what I have for sizing:
Dayton HO 18" sealed: 2.5 cuft
Dayton HO 18" vented: 4.5 cuft
Dayton HO 15" sealed: 1.5cuft
Dayton HO 15" vented: 3.5 cuft 24Hz
Dayton HO 12" sealed: .8 cuft
Dayton HO 12" vented: 1.3 cuft 24Hz
Given I only listen at -15dB max volume with subs 6dB hot I really only need to hit 101dB (or would it be 111dB) from all of these. I think 2 15's and 2 12's sealed would hit that.
Attached are some compression sweeps I did when I first got the LVX 12's. I can say that the 0MV one was uncomfortably loud. I don't even remember if it's the 110dB humps (no room correction) or even the 101.
The 18" vented is just too big of a box, heck the 15" vented is not my fav either (but maybe I could squeeze 3 cuft and give up some low end).
77" C9 + NAD 758 v3 with Dirac 7.6.4 + Rotel 976 + Panamax M5300-PM
Speakers: Paradigm Prestige 75F's + 55C; 8x Paradigm CI Pro P65-R's
Subs1: 2x LRK Build Thread
+ 2x Rotel 981 (bridged); retired: VRK Build thread
Subs2: 2x Rythmik LVX12; 2x Dayton HF 12's Ultra-NearField + Crown XLS 2002
MiniDSP HD & Non; DIY Room Treatments: Dutch Floral Prints