2 of my LMS'es aren't summing correctly below 7hz now that the 21's are powered up.
I believe it is a phase and timing issue, I think I might be able to correct it by physically inverting the wires... but I don't currently have discrete DSP channels for the 21's so I might just have to live with the lack of timing for now.
But overall I didn't gain any SPL below 5hz, I believe that is because the DCX rolls off at 8hz, so shelves and room-gain are the only thing keeping it alive.
That and, I think the 21's are just simply too inefficient at 2-4hz to make a big difference.
Also, my room acts like a 5hz sealed box... because that's basically what it is. So that doesn't help either.
When I open the theater doors I gain 10db @ 1-5hz.
I don't really care about 1-4hz, I just thought I'd mention it...
Up until 8 drivers the SPL was summing perfectly in 6db steps, and then between 8 and 14, a brick wall. That's as far as I got.
Ya know, it would be great if TC stuck around so that I wouldn't have to mix and match different brands.
The various vendors keep going bankrupt before I can buy an array of drivers.
Adire, Exodus and then TC, it's so sad!
I haven't EQ'ed anything yet, this is RAW response @ LP by the way.
My room has a nasty 90hz dip, I've known that for a few years now.
The 21's are in Pi space, the LMS are in Half-Pi space, at roughly the same overall distance.
All the subs in Half-Pi space are showing a 28hz room peak.
Above 60hz my room descends into room-mode chaos.