Subwoofers - Final Thoughts with Martin Logan ESL 13A

My CLXs are bolt upright (to within 0.1 degree using a digital level) and are with exactly zero toe-in and exactly the same distance from the front wall (5-6 feet) and the side walls, using a laser "tape" measure. Speakers and I are set-up in an approximate equilateral triangle.

No need to measure thanks. I can do all of that except get the speakers 5 - 6 feet out into the room. I would have no room left! But just for fun, when the wife is at work tomorrow, I may just give it a shot!

ML recommends the rear of the box to be 0nly 10" off the back wall for the 11As (I’m a tad more than that) and 24" off the side walls. I’m 24" off the left side and open to a kitchen on the right. I usually set the toe in with ML’s flashlight method to begin then move them around accordingly. My wife likes them toed in a bit more. Again, I will play around with this tomorrow. Thanks for all your suggestions!

@elliottbnewcombjr interesting, thanks. Tough to find any reviews on them, been around since at least 2012.

@docknow - see above

My first recommendation would be 2 subs at a minimum.  I've had the Swarm and it would likely work well with your room.  Acoustic studies (see @rauliruegas comment on my post-Subwoofers are a superlative room treatment) demonstrates that 4 subs are the optimum number.  The Swarm enclosures are small enough that they will likely fit well in your space.  These little guys can put out bass, but by virtue of the noise cancelling properties of 4 staggered subs, will make your overall sound much better. Much much better. Duke Lejuene, who designed and manufactures the Swarm, is also extremely knowledgable and will help you with the set up and adjustments as necessary, as he did for me. He will also help you decide if his system will work with yours.   I did switch them out in favor of 4 B&W DB1B's, though.  My Magico S7 speakers have 3 10" woofers apiece and the the Swarm has 4 10" drivers-not enough for my system, but likely more than enough for yours. There is contact info for Duke on the Audiokinesis web page.  I'm excited for you-a pair or 4 subs will do a lot for your system once set up properly!