the speaker should read 4 ohms with a vom volt ohm meter on the continuity test, you should read infinity between case metal and either side of the voice coil. if not speaker coil is shorted to ground and will blow the amp and possibly blow the board . speaker should reads 4 ohms if speaker is ok. sometimes the speaker opens up no resistance i recently had a ps 2 3volt board the all was wrong was the coil opened up on the speaker. you have to remember ps 2 boards can have amp failure just from a track short. did you try another speaker and see if sound returns. i have 4 ohm 50mm speakers if you need one or you can directly order them from MTH DIRECTLY! the speaker must not be plugged in when you test it!
Alan Mancus
