that's wat i done...thanks..
actualy i found out the 2/4ch selector is for the rca input..like say if u got only 1 pair rca running full freq, then u can select 2ch, it will bypass the signal to the other 2ch..so u just need 1 pair rca to run the amp at 4ch..
but if u got 2 pair rca running with diff freq, then u need to select 4ch cos it will separate 2ch each and then u can make ur adjustment thru ur HU,preamp or
e-crossover for different ch....see the difference? it's not mean for select the bridge mode..every amp can auto bridge when u connect it in bridge mode..only 1 model i know which cant do auto bridge which was from an sony..a few years back model..that's the 1 i saw b4..the others brand never..but maybe my world is too small...