Some amp has glass or plastic fuses along with a pic fuse a little green tear drop shape fuse on the board that plugs in like a fuse, see if yours has one of them if not then I'm sorry your unit is bad.
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That all depends on the wattage of the subs. also the independance of the subs. If your amp is 1400 watt, maximum you want is 2 600watt subs. if your subs are higher you will blow your amp eventually as your amp isnt powerful enough to pump out to that level.You should never have your amp fully turned up to max, 80% is perfect and will not make your amp blow. Hense why you want your subs less than the max output of your amp.
Usually the adapter will over ride the battery when used. 1) Make sure your 1/4" cables are working properly without the pedal "in-line".
2) Take out battery, and use just the adapter only. Make sure it is the correct and proper adapter that works with Boss. Usually the PSA-120. If you are not using a Boss Adapter, make sure yours is a direct replacement with same specifications. 9V/200mA. And "tip negative". DO NOT use Radio Shack stuff, nothing against them, but there adapters just don't mix well with Boss products and the like.
2) Try just the battery, no AC adapter. Remember to unplug the input when not in use. Saves battery.
Basic rule of thumb...when using correct AC adapters for all your pedals all the time, and all sounds good, then take out the batteries.
If you still experience problems, it would be an internal IC chip most likely. From there post another question maybe.