Suuuuuuuuuuuper intrigued by this new 21" option! (FYI Alice needs to stop eating those pills, this whole big, small, big, small cycle is making me dizzy!)
Apologies for my usual long-winded posts, lol.
So, I had devised a plan, but given the introduction of this new driver at a fairly wicked price point, now I am second guessing and possibly changing said plan.
Anyway, the original plan started like this:
My ULF monster sub (dual opposed AA Avalanche 15s tuned to ~11Hz) is grrrrrrrrrreat for insane SPL from 10Hz up to 50Hz. I get about a 10dB drop from 50Hz to 60Hz, and it remains fairly flat from there up to 100Hz. I EQ'd the 60 to 100Hz area up a bit, and it is better but needs some help still.
I am also running a lilmike's Cinema F20. By itself, it does great in the midbass. However, due to lack of optimal placement options, I ended up with the mouth of the horn firing sideways in the only place it will fit in the living room. It used to be in the corner where the ULF box sits now, with the mouth firing almost directly at the couch.The ULF box only fits in that corner, so that is where it is going to stay. The combination of non-ideal placement of the horn, plus mixing it with ported boxes, wreaks havoc on the frequency response. I have measured and tuned and still feel it is lacking chest slam. I might
be able to get it a bit better than it is, but I have this thing called an addiction. In order to satiate this addiction, I must build more boxes!
I picked up a blown Aurasound 1808 from the 'bay for wicked cheap. I contacted PSI (www.fixmyspeaker.com
) about having them set me up with something similar to the TC Sounds A1808 basket that was once available. I also might be purchasing 2 more 1808 motors, depending on PSIs response to my inquiry. See, the TC A1808 assembly required the removal of the 1808 motor's Faraday ring. Their reasoning was that the increase in Le was inconsequential, and the Faraday ring decreased the gap clearance too much for their coil. Now, I must stress that I would like to keep the Faraday ring. Of the two motors I am looking at purchasing, one has had the Faraday ring removed. The seller wants to sell both motors together, which I understand. If PSI feels the same as TC and doesn't think the motors are usable with the Faraday ring, then I'll purchase both motors. If they feel they can make the Faraday ring work, I'll keep looking for 1808 motors that have not been modified. PSI is crazy backed up at this point, so I have not heard from them yet.
The plan was to build a large ported box for 2 Aura Hybrids that will fit where the F20 currently sits. I think replacing the F20 with another ported box will make it much easier to get all the woofer boxes playing nicely together. The 1808 hybrids would decimate the midbass, and given the large Xmax and linear BL curve of the underhung neo radial motor, should have no issues pushing the lower frequencies as well.
But, given this new 21" option I am at an impasse. For 300 bones each, it is quite a bit less expensive than going the Aura route. If I choose the 21" path, I'll continue to look for Aura motors, hopefully at a price point similar to the blown driver I got from eBay, and save them for the basement towers and center channel. If I can find enough of them, they would be amazing for what I have planned for the basement.
Time to run some sims... what say you? WHAT SAY YOU?!!!
EDIT: I happened to have taken a photo of my measured ULF sub in room response, and I actually only lose about 10dB between 50-60Hz, not 20dB as originally stated.