Which subwoofer?

I find myself in agreement with @jwillox . I moved from a pair of ML Descent i sub’s sporting the optional crossover cards with my ML CLX Anniversaries to a more centrally positioned single ML Balance Force 212 and preferred the ease with which a single source base extension integrated with the main speakers and room.

That said for 80% of my music predictions I switched the subs/s off as I prefered the more natural midrange of the CLX’s with their own integrated ESL base panels which measured down to a solid 46Hz -4db  in my room. 

I have a small room and also have ML electrostats. I have them paired with an older Velodyne DD15. Integrates very nicely. IME, I wouldn’t go with anything smaller than a 15. When my Velodyne finally gives up the ship, I’ll be replacing with a Rythmik F15 as it’s servo controlled much like my DD15. I’ve researched a lot into SVS. Great customer service but their subs don’t seem to be well-regarded for music. Geared more toward home theater.

kenrus, 

This might be what you are looking for and they have a 45 day trial plus free shipping!

https://www.svsound.com/products/3000-micro-subwoofer

All the best.

JD

Hsu Research, 18” Velodyne, or the “El Pipo” DIY sub ( this would be my choice”. 

@bdp24 

You got me interested! :-)

Which GR Research Kit do you use? The one with 1, 2 or 3x12" drivers per amp? How many in your room? How far away from the walls do you have them in your room?

I have a couple of Rythmik F12 in DIY sealed heavy boxes, with the same plate amp GR uses (A370PEQ), although with the aluminum driver. I've gone deep into DIY speakers and I'm running open baffles above the subs (65 Hz). I was thinking of eventually adding another pair of F12 to create a DBA, but maybe I get a couple of these plate amps and more drivers and have open baffle DBA...