Originally Posted by BlueFireIce
Guess I should have stated this also, this is one of the first things I did, and yes, the system will run at level 49 (max) all day long without the tube, but with the bass turned up and the system on 29-30, it will cut out (with the tube hooked up).
It doesn't sound like you are running the headunit the same without the Tube connected. Are you dialing in extra bass at the headunit once you connect the Tube? If so, you may be causing the amplifier of the headunit to overheat and go into a thermal protection mode. Connect the Tube leaving everything flat (do not add any bass) and see how the unit plays. If it still shuts down you need to examine all of the connections made with the FAST-9999.