If you can't afford the Lightning, why not try the Toten Dreamcatcher sub? Especially if you have a small space.
Sub for Totem model 1
Hi I have Totem model 1's with muse 100, melos sha 1, mac hard drive into squeeze box2 into ack dac 1.3 would like to get a sub, any recomendations? Can this be done for 500$? Thanks