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.

rmarcus575710-24-2012 8:00pm

steuspeed Details Discussions Posts This discussion Message User 501 posts 10-26-2012 at 10:37pm Copy Comment URL Report Comment Edit Delete http://app.audiogon.com/listings/full-range-bruce-edgar-seismic-subwoofer-horn-loaded-subwoofer-enclosure-2012-10-06-speakers-21212