June Stereophile has the Velodyne DD in it where reviewer say's first "super sub" (here the big 18" flagship variant) that lives up to it's hype and that on screen set up (you could bring a TV in just to set it up combined with electronic set up is stste of the art at $5K and blended effortlessly with his Quad 989's.Problem that many subs have had with fats panel or elctrostatic speakers have been their speed.Some of the better subs for music as opposed to HT where SPL or "Boom in the room" is the desired effect have been multi driver designs like the REL subs imported by sumiko.Only few large driver subs like the Revel which is a good performer for $3K can move fast enough to give proper pitch definition and not produce nasty artifacts you don't want.It will be interesting to see what those two companies come up with.Since they make electrostatics the Martin Logan Descent might be worth checking out.But after reading that Stereophile article I wnt to see aht the 15" Velodyne has going for it (or has left out of it) at $2500.P.S> for freinds looking to get some bottom end on the cheap a new or used Vandersteen can't be beat.Not the lowest and you can't expoect the world for $1250 but it uses the multi driver approach and a crossover that works from the main amps main posts ans thus reacts to the entire wanveform.Incredibly good performance for the buck.Also even though you can't localize stereo versus mono below 150hrz having two versus one depending on the usb and set up can make a huge difference and often is worth it.Depending one might be better off getting two subs instead of one.Like in the Revel hi end system there was a modest priced company that advertised on Audiongon with boxes that had short profiles and could ordered with or without amps with the idea that you could get without and an external amp/x-over box and add second sub latter and it had two levels or performance.can't remember name (three letter tag of some sort) and got good reviwes and best three box system came in at $2K or so.
Chazzbo
Chazzbo