nad left channel goes out


i have a nad 2400 w/ 1600 monitor series...it will be playing just fine, and all of a sudden left channel goes. if i crank the volume up on pre-amp it comes back (i know you shouldn't do this), my question is, how do i tell if it is amp or pre-amp problem.. i do not want to disasmble entire system, if i can just remove one for repair.
jean
inletwolf
i really do not want to be the dumbest one here...but could you be more specific??? swap them from where to where... the speakers on the A channel go diectly out of the power amp to the speakers. the B chanel goes into a speaker switching box.
thanks
jean
On the back of the amp do you have left and right speaker output,if you do swap the speaker wire at that point and see if the problem reverses if it does not the speaker or the wire is the problem.
i tried swapping the speakers..it doesnt change anything. i think it is the amp..but i am very confused why the balance contol does not change from left to rt..like it should. it seems to be just going out in the B chanel not the A..but is always left..i cant figure out how to make them reverse.
like dick was saying it would do?????/
jean