Can anyone recommend a transmission line subwoofer


i am looking for suggestions as to ready built transmission line subwoofers to use with Quad esl 57's. thanks in advance to everyone.
rmarcus5757
The REL Stentor 3 and Studio 3 subwoofers (probably also the older models) are loaded with a folded transmission line which REL calls a "Super Acoustic Resistive Matrix".

Most PMC speakers make use of the LT principle but I do not know whether or not this is also the case for their subwoofers.
http://app.audiogon.com/listings/full-range-bruce-edgar-seismic-subwoofer-horn-loaded-subwoofer-enclosure-2012-10-06-speakers-21212
Wisdom audio makes 3 different regenerative transmission line subowoofers. The scs sub - is $4000 and has its own internal amplifer and is truly fantastic sounding. You are on the right path - T lines are about the only thing quick enough to mate with statics.