I have an LS-28 and have ran into the same problem. Switched to a REL sub using the high level input (driven from the speaker outputs) and it works great. I’m running a Rogue Stereo 100 amp with KT-120s.
@lalitk, I’m using two (stereo) REL T/zeros. My dedicated listening room is only 11 x 18 and I have two pairs of bookshelf’s I alternate between, Harbeth 30.1s and Revel M126be. If I had a bigger space I would have gone for the new T7i or T9i which, frankly are better RELs.
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