JL Audio hifi subwoofer match for my system

You have a fine set of speakers. Unless you are willing to put a two way crossover with digital bass management into your system you stand a good chance of making things worse. Subwoofers add the most kick when they are crossed between 80 and 100 Hz. Adding them below 40 Hz is silly. There is not much music down there! It also does not help your main speakers. Taking the low bass out of them significantly lowers distortion and can increase head room if the speakers are limited by their woofers. The JLs do have reliability issues and they are not up to date designs. The best subs now use opposing drivers in a "balanced force" configuration. Examples are the Martin Logan BF 212 and BF210, the KEF KC 92, and the Magico Titan handily the best commercial sub made costing a mear $32,000 which is why I made my own https://imgur.com/gallery/building-resonance-free-subwoofers-dOTF3cS

In your system a MiniDSP crossover and two KC 92s will do the job, but two BF212s would really kick a--.

@upstateaudiophile During a short experience we were surprised by how the JL A.R.O. F113’s output stature closely matched a DD-18 Velodyne...so much for driver size.

On the other hand we eventually bypassed the single frequency A.R.O. and used the Velodyne multi parameter Optimization with the JL providing an enormous improvements across many aspects especially when adding +dB’s below the 20Hz region.

What is your impression with Martin Logan’s, is it (ARC PBK?) compared to the JL’s auto only peak limiting D.A.R.O. V2?

@m-db that’s good info you provided. I used ARC Genesis and PBK. On JL I did professional in home mini-dsp as well as DARO bypassing the mini-dsp to compare.  The ML setup crushed the JL one. And we’re talking a 3-4k setup vs like 11k. It was shocking yet I know we did the setup correctly and I did it again and again to confirm.