Subwoofer Advice

Martin Logan Abyss10 that they just came out with.

Also if you can find a force cancelation sub that might work also.  The ML balnceforce 10 is just a hair too big. As is the Rythmik G22.  I own a power sound audio dual 12 that they don't make anymore.

Two subs. One for each channel best. The bigger the room the bigger the sub(s). 

I run 4 SB-1000's (no Bluetooth). Small, tight, sealed box, and they were cheap ! The front one's in are in phase. The rears are 180° out of phase, Tunes the room's Bass nodes perfectly. I still have a 50Hz - 60 Hz hump in the room. But I like it. I don't use any DSP and chose to tune the room instead.

I listen to A LOT of SACD's/DSD files and refuse to convert the DSD to a PCM stream (been there, done it, got the T-Shirt).

What is the size of the room the MLs are in? Did you get the Anthem room correction for it? Does it have a bass EQ function?  I can help you figure this out, but I need this info first. It is possible you may not need a subwoofer at all. 

Mike

I have 2 x SVS 3000 micro's used with Trinnov correction alongside my Wilson Benesch front speakers in my Lounge.  The micro's were chosen over the SB1000's only because I could not get a position (as I do in my other room where I have SVS 16's to get front firing alignment (partly done with Sneakers Track 4, partly with Trinnov).  I would agree with @soix  and @rajugsw that the 1000 / 1000 pro would be better for that use and would have gone that way if space allowed (micro's are behind slightly outboard).  But they do (with the correction applied) do a very good job.  But, I haven't tried to time align them through position without the correction and I suspect, having tried that once before with a Kef dual firing unit that it would be more difficult to get a satisfactory result and both this and discussions with Trinnov on emerging technologies such as their wave forming would, wherever possible lead me towards a front firing sealed box wherever possible.