We have two LI Model 1 systems that we purchased ten years ago for a small acapella chorus. One of the power stands is working intermittently. If we let it warm up for 15-20 minutes it works OK but we haven't tested it through an hour-long performance. I contacted BOSE and was told that the newer power stands will not accept the L1 Cylindrical Radiator Speakers that fit into our current base. Do I have any other option other than replacing both the power stand and the speakers?