I bought a KEF Kube 10b to use with a pair of LS50s. I had planned to drive them with speaker-level input from an Ayre A7e integrated that has no other provision for a sub. But I learned grounding the Ayre amp with connection to a sub could be disastrous. I might try to return the unused sub to KEF, or use it for HT -- mostly cable TV, and free up a pair of Velodyne HGS-10s to use with the HGS-15s for four sub stereo.
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