BEST SPEAKER THAT COMES TO LIFE AT LOW LISTENING LEVELS

High efficiency horn loaded + EQ, either software based at streamer or analog piece between DAC or pre.amp and amp set to compensate for fletcher-Munson curve noted above. I often listen at low volume and have a Klark-Teknik DN-360 between DAC and integrated amp feeding Klipsch horns. Sounds very full and alive at low volumes. When I turn it up louder, simply disengage the EQ or turn boost way down. Works great.

With your budget look at Volti horn loaded speakers.

My Fleetwood Deville SQ sound amazing at lower volume.Mids and voices sound awesome especially now that I added 2 Rel S510 subs. I too cannot listen at too high levels as I have some degree of tinnitus but my setup is perfect for listening at low levels without any details and dynamics lost.

Fischer & Fischer SN 370's. The slate cabinets cannot be beat for what you're looking for. And they are $15k/pr.

I’m not sure you can do better for low volume listening, as electrostatic speakers are known for their resolution at low levels (mainly due to the lack of mechanical hysteresis - getting that heavy cone up and running - in dynamic drivers) and your Martin-Logan’s are definitely fantastic electrostatic speakers.  Panel speakers, like yours, are very nearly line sources whose sound pressure decreases 3dB with each doubling of distance (the inverse law 1/r) where as point sources (cones, domes, etc) follow the inverse square law 1/r*2 where sound pressure falls off by 6dB per doubling the distance.  I think maybe some EQ options that others have mentioned might be the best solution. A Schiit Loki+ 4 band EQ at $149.00 between your preamp and power amp would handily do the trick.  It’s totally transparent, easily bypassed, and made in the USA.  The Lokius at $299 takes you to 6 bands and balanced in/outs. The Loki Max at $1499 adds remote control to all the controls. Enjoy your great system!

JBL 4349.