Subwoofer Advice

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.

@navyachts 

You are welcome, the room I have the micro's in is 27 x 15, but no 'space off' and notwithstanding my and others on the SB1000's, etc., They manage, with two other 10" subs in the rear corners to pressurise.  I am not disagreeing with @rick_n that if you can fully pressurise with some larger say 12's (precisely why I have 2x16 1x12 and 2x10 (soon to be 2x13.8) in the main room that you won't appreciate it. But when I have my audio set using the SVS 16's in the main room it is timed impact and timed midrange reinforcement, rather than out and out pressurisation that makes it sound "musical".  The arc should align 2.2 which ever sub you chose well because Trinnov manages to great effect in mine even with not ideal sub-placement. If arc for some reason doesn't then perhaps see if somebody can give you a home demo on either something with dirac, or a trinnov (amethyst or st2-hifi, latter would be ;old stock') just to see what can be achieved in the room.  Correction ARC or other could give you more flexibility with placement on subs.  But the (see REL video you tube) placing using track 4 from sneakers should give a good start if you can place them alongside the speakers. As Rick_n notes 2x12" so SB1000 pros (with the 5% off for "godual").

@navyachts "you have 5 subs in your room, with another two on their way?"

I have 5 in the room but the two rears were down firing ported studio because I could not at the time get a front firing that would fit and was balanced.  But recently I have been discussing development of wave forming with Trinnov and front firing would be much better for this so the rear down firing will be replaced by the Norwegian Arendal 1723 subwoofers that are strictly speaking 'side firing' or double side firing.  Are 18.9" H x 13.2" D x 17.7" W.  With a 13.8" driver in a sealed enclosure.   Not as good 'value' as the SVS on $/watt / inch.  But I cannot find a better alternative as I have a 15" depth restriction.  And my son gets two subs for his AV room.

Another potential for your consideration.
Just seen a review by Nemo Propaganda on youtube of the Buchardt Sub10 where it was compared to both the Kef and the SVS 3000 Micro.  Different form factor to the KEF but has a good app and a level of built in correction for less than the Kef 62.  Might be worth a look.  I confirm @big_greg's, expectation that the SVS Apps are very good. If anything the Buchardt looks more sophisticated, are very usefully the microphone set up for the room correction is done by linking it to an iphone which it uses as a mic. The results of this are noted to be as good as connecting it to a dedicated room correction mic.  Seems to be $1400 each.  Less than the Kef, about $500 more than the SVS, but suggested to be better than the SVS and slightly better than the more expensive Kef. 

@navyachts I will have a look at Steve Huff’s, I just knew the other guy had reviewed the Kefs and SVS Micro’s. If Buchardt did something a little bigger, say a 12 or 13 size wise they would be great for my rear set up.

But if those 10’s are big enough for your room, placement seems to be very flexible

Not that I want to turn you away from a UK manufacturer like Kef - UK HiFi Development is part of my ’income’, though not on any product I’ve ever commented on here.