i got a pos pioneer gm-5300t 2ch amp for my gfs car as a temp. amp while my mtx 7801 she was using is being repaired, when i got the pioneer one of the speaker output terminals was messed up and it keeps blowing fuses after playing it for a while, so i opened it up and removed the speaker terminals and soldiered 16ga wire to the board (the way all amps should be imo) and i bypassed the fuseing by soldiering a piece of 12ga wire across all the soldier points on the board for the fuses and i am going to run an 80amp external fuse, anyways i noticed a switch on the board that said bfc on the bottom and spl on the top and it was switched to bfc im curious to what this is and if it would be any advantage to flip it the the spl side? i read in the manual and it said that , if you hear a beat while listining to an AM broadcast to flip it with a small screwdriver. anyone know?

Edited November 18, 200915 yr by adamsracing1992

i got a pos pioneer gm-5300t 2ch amp for my gfs car as a temp. amp while my mtx 7801 she was using is being repaired, when i got the pioneer one of the speaker output terminals was messed up and it keeps blowing fuses after playing it for a while, so i opened it up and removed the speaker terminals and soldiered 16ga wire to the board (the way all amps should be imo) and i bypassed the fuseing by soldiering a piece of 12ga wire across all the soldier points on the board for the fuses and i am going to run an 80amp external fuse, anyways i noticed a switch on the board that said bfc on the bottom and spl on the top and it was switched to bfc im curious to what this is and if it would be any advantage to flip it the the spl side? i read in the manual and it said that , if you hear a beat while listining to an AM broadcast to flip it with a small screwdriver. anyone know?

You just answered your own question. So, do you hear a beat while listening to AM radio? If not, then dont flip it.