Responses from stevezee

Martin Logan Descent makes “gyroscopic” sound
Ok problem solved. There was a large metal fastener stuck to one of the magnets of one of the 3 woofers. When the volume was turned up it most likely vibrated loudly. 
Martin Logan Ascent Power Issue
There’s no fuse  
Martin Logan Descent makes “gyroscopic” sound
Thank you. It only happens at a quarter volume and up and not when there is no music playing I’ll check the coils. great idea. There are 3 woofers in a triangular pattern.This has been going on for a while.