MY PATH TO OPEN BAFFLE:
I wrote extensively on my experimentation with HSU Mid Bass Modules here:
https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1360355711Basically a somewhat traditional Box Style Sub. What is not traditional about the Mid Bass Module is it's ability to play cleanly up into the Mid Bass Region. Things I learned include:
When using a separate amp (plate or other) you have to get rid of any and all Hum (even very low level stuff). I learned a lot about eliminating ground loops and power filtration.
Especially with a down firing Sub you have to use some type of Isolation Platform to minimize introducing floor vibrations that muddy the Bass. Also found placing the Mid Bass Module too close to walls will cause wall vibration that is transmitted to other room surfaces.
Over a year ago I purchased a pair of Omega Super Alnico Monitors (Single Driver, No Crossover) and was Floored by their performance. Really drove home how much a Crossover Circuit can suck out of the music.
This led me to By-Pass the Crossover on My Mid Bass Modules. Surprisingly, running the Mid Bass Module 12" drivers full range sounded better. Next I Bypassed the Plate Amp completely and drove them directly from my Super Zen wired in parallel with the Monitors with further improvement.
At this point I was at a Cross-Road, what to do next. I considered building new Mid Bass Module enclosures. As good as the Mid Bass Modules sounded there was still a lot of cabinet vibration. The Boxy Colorations Open Baffle people talk about. So it was at this point I ordered the Baffles from Randy and decided to experiment with Open Baffle Mid Bass Reinforcement.