Originally Posted by Gooddoc
The sealed 15's are a bit small in displacement for my tastes, but I do think that corner loading 4 of them will give me the clean reference level output into the high teens(maybe even low teens) that I'm looking for. I am looking to get the best response across all my listening positions, so I went from 2 dual 18" JTR's to these 4 15's. I just couldn't get those monster JTR's where they needed to be to optimize the response the way I wanted it, and adding two more was just out of the question in my room.
Fancy running into a JBL M2 guy here
. But I went with a quad set of ULS-15 Mk 2s for similar reasons. I had thought about swapping my old ULS-15 Mk I pair for something in the Seaton line, but considering that I live in a condo, and that I really didn't need to rock the house six floors down at 10 Hz or lower for my movie tastes, I ultimately decided that four 15" subs were a better option than two Seaton Submersives, or waiting for Mark Seaton to produce four of his "half Submersives" in time. I ultimately wound up spending the savings on a better PJ (JVC RS600 on closeout).
It ultimately worked for me...with 1/4 & 3/4 front and rear wall placement, I was able to get smooth, non-distorted output with non-destructive ringing from about 15 Hz to about 90 Hz, where my mains took over. I had tried corner placement, but I had to fudge it as one corner of my room had a door and I consequently didn't get good results. In my current placement, I have consistent enough output for all three seating positions (three seats in a sofa's single row) that room EQ was really more icing on the cake to bring down a few remaining peaks in that range.
Even if you corner load and use EQ1 mode, I'm not sure that you'll wind up with useful low teens output unless you really get lucky. However, from personal experience I think you can realistically hit 16 Hz with clean output and low distortion, especially if you're not looking to actually listen at 85 db reference levels and 105 db peaks.
My goal was to get the smallest subs I possibly could to achieve that goal. I would rather have a little less output, but a much better FR.
I would add having bass decay down -20 db from your response, at least at 450 ms, to the list as well. You would want an Omnimic or better yet, REW, to measure that.
I've got a balanced miniDSP 2x4 and I'm going to use the MSO software to optimize them before I EQ them with Anthem's ARC room correction.
Good choice, as long as your seating positions aren't too closely together. MSO doesn't work well if you just want to optimize one seat and have to do tightly bunched measuring positions (a minimum of three, as per Andy, and I think you'd want a minimum of 1' apart from what I've read on the MSO thread).
I'm a bit excited about it since I'm expecting stellar results from that combo.
I hope you can. The HSU subs are underrated compared to flashier brands on AVS IMO, but there's a few serious AVSers I know that have them and use them productively (although most of the ones I'm familiar with are still using the Mk 1s as they've been happy for a few years). It's all about the multiples.