I also have a pair of LS 50s that I have set up in a small unused bedroom. I'm using a JL Audio Dominion 108D sub that is down -1.5dB at 31 Hz. I added a second identical sub but found that it overpowered my small listening room and ended up returning it. I'm very pleased with the balance and speed of this single smaller sub.
Small or large sub for music
I've been using a pair of Velodyne HGS-10s to supplement KEF LS50s below 50 Hz, but I read that larger subs are better for music because the cone needs excursion. Is there any truth to this? I have a pair of HGS-15s that I could use to supplement the LS50s or Reference 1s (below 40 Hz) if I go there. The HGS-15s do HT superbly.
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