Peavey MiniMax 500w

[petetexas]

My Peavey head was connected to a Markbass 2x10 cab , running very quietly at bedroom level . After about 15 mins , I noticed an electrical burning smell , and the amp made a strange squeaking sound , the cones of the speakers moved from rear position to front and the sound died .

Speakers were now solid , no cone movement . Bought 2 new Markbass speakers , and replaced them in cabinet , and all works well with my other two heads ( Carvin and Ninja ) .

I opened up the peavey head , no sign of any burning on any of the boards .

Does anyone know how to check the output of a digital amp . say with a multimeter ?

Pete