I usually set my gain to correspond directly with the RCA preouts. My headunit's preouts are 2V, so I have my amplifier gains at 2V.

Are there any con's to this method, and if so, what alternate setting would you recommend?

What I am noticing is that the 6x9s and tweeters driven by the 4-channel amp are very loud, while the subwoofers are pretty quiet.

Also, this is probably a stupid question, but is it better to boost the subwoofer bass directly on the amp (0-12dB **** on MTX JH1200), or from the headunit (Kenwood DNX5120)?

Thanks!

 

I have never paid any attention to the writting on the amps when tuning them. Your ears are the deciding factor, not if they silk-screened the numbers on straight.

Turn the bass boost off, bass and treble settings flat and pick a cd that you are familiar with and that has a good sound quality. Turn the gain on the amp all the way down, and then set the decks volume at approx 3/4 full volume. If you have the deck hooked up to any speakers, they should be loud, but clean and the signal should not be clipped. Now start to adjust the gain on the amp upwards and listen the signal. Adjust the gain until the signal barely starts to clip(or sound bad) and then tune it back down just a hair so it is again clean and there is no clipping. That is all it takes.