Just began setup of audio equipment in different room. During my subwoofer checkout I noticed that the LFM's power indicator was red. First checked to make sure I had the power toggle in correct position (middle). Then checked to make sure that the other positions in the toggle worked correctly and they both passed. I thought maybe the upgrade to the pre-pro cause an issue with the sub-out and it might be dead, not the case. So, turned off the amp to the speakers just leaving the pre-pro and sub powered. Amazingly, the sub is working however the LED never changes from red to green. Is this not that big of an issue or could I be on my way to larger problems with my sub? Any help, ideas appreciated.