Awesome thread! but boy is it long! I've read every single post while having coffee every morning for the past two weeks, so hopefully, I'll not ask any redundant questions.
I'm about to embark on an MBM journey of my own, but wanted to see if others had already tried some of these options and just not posted yet.
First, background: I have a very complex 5.2.4 setup with active L/C/R driven by a DBX DriveRack 4800 speaker processor, Marantz AV8802 pre-pro and I have Audyssey Pro. Current DIY subs are a 4x15 IB and a UM18 based sub in a 15CuFt sealed enclosure driven by a Crown XLS2500 bridged. Subs are at mid-point of front wall (IB) and mid-point of back wall. Room is 15x26x10 dedicated HT with floated floor (over a crawl space with equal volume as room, thus perfect IB rear chamber). Room has extensive Acoustic treatments, I mean a literal ton of them. Bass decay is very clean.
I have good ULF performance, and thanks to IB rear chamber being beneath the floor, lots of TR down low. What is missing is the mid-bass at the MLP, partially due to unfortunate room nulls in the 50 to 70Hz range where seating is, and partially due to my huge Electrostatic panels overpowering the woofers on the L/R at higher volumes.
To fix the later issue, I am about to deploy a pair of MBM where MB = 50 - 250Hz, and location is right next to the L/R Monoliths. I'll be using the DriveRack 4800 speaker processor to create a new bandpass specifically for the front MBM to operate from 55 to 250Hz. The box is the same Goldwood 12” ported 1.5CuFt box
suggested earlier in this thread. The driver is a HiVi M12 (Al/Mg cone) designed to have very clean upper bass performance for good SQ at crossover to the ESL panel.
I have these built, and will test them as NF MBM just for grins this weekend. Here’s a pic of them next to the Monolith and its aftermarket Eminence woofer (covering 60-300Hz) I put in a decade or so ago.
The plan is to build / buy a NF MBM and place directly behind MLP Ekorness recliner. Since going to subs >2, will deploy either a MiniDSP HD or a DBX DriverRack Venue360 for EQ/Delay/etc. and present Audy a single optimized sub channel. Might even build out a second (have the box, not the driver or amp) UM18 based 15CuFt sealed to place side-wall parallel to MLP to fill in some nulls and give MSO more to work with.
My questions are:
Has anyone tried that Goldwood box + a Dayton PA310 (or equivalent) as a NF MBM focused on 50-100Hz?
Besides the DIYSG MBM described earlier in the thread, any other deployments of that MBM?
I kind of prefer to have the amps in the AC cooled equipment room along with the rest of the gear. But if I must, can do the pro-sound PA subs with built in amps as long as no fans. Suggestions welcome.