Very nice build Wem...
I'm interested in doing the same but I have a couple questions that have popped up in my mind.
In my main theater, I currently have 3 original MFW-15's that work great and sound great as well. The graph for my room with them is attached. I'm having trouble trying to post it so I had to put it in a word document. Sorry.
Anyway, the current 3 MFW's with room gain go down to approximately 15Hz Attachment 215610
I currently have the 3 mfw's in different places in the room. 2 are up front and the 3rd is on a sidewall midpoint. In order to minimize cancellation, I needed to play with the phase control on the 3 subs. The two upfront are basically set at the same phase, but the mfw at the sidewall midpoint is somewhere around 90 degrees from the other two.
My room placement options are somewhat limited and I would like to use the same locations for the 4 new opposed build's using wembleys design. So the question then is, if I run the 4 new opposed builds with a EP4000, how is phase for something like this addressed? I understand you could wire one bank of subwoofers at 180 degrees via reverse polarity, but what if you need something other than a 180 degree phase shift? Are you SOL or what are the options?
Next question, if I do this build, I will likely try the EP4000 with a sms-1 for equalization. Is it ok if I run something other than a 2, 4, 6, or 8 ohm load with these if I decide to add more than 4 of wem's builds to my theater? I'm assuming this isn't a problem as long as I stay above 2 ohms, but figured I'd ask.
Lastly, I'm assuming that going from 3 of the original MFW's to 4 of wembleys dual boxes would be a pretty big improvement due to the increase of volume of the air moving but I'm just trying to get additional impressions from what I might expect from this upgrade. I imagine going from the ported MFW's to sealed would sound somewhat different anyway. The original MFW's are actually pretty impressive if you don't have problems with them. I don't think I really need to upgrade but when you're into a hobby and some sort of project comes along like this, well, I've got to consider it.
Thanks Wembly and all and I hope this isn't considered a thread jack. I really dig this project!
Best wishes everyone,