Is the MB2-500 designed to play through headphones without speakers attached?
The headphone output on mine was nice and clear last week when someone posted this question and I answered that I could hear both of my basses just fine through the headphones without speakers attached. I have not been able to duplicate that feat since, regardless of which bass I plug in or which cable I play through.
There is a headphone switch on the back; one position is for line out and the other sounds like something wants to ... happen.
As reference, both basses play just fine through my Peavey Max110 with little gain required, regardless of cables. The headphones are ProFormance P6000 and Sony 7506 cans.
It should work fine without any speakers connected. The old MB series amps and combos could do this too (except they didn't use a switch).
SNAP! Then that means my headphone jack shorted out -- or the button switch did -- and I didn't even know it.

