id recommend turning off the subs and getting the deck set so that your mids and highs sound good at the loudest setting you listen to your music at. then leaving the deck settings where they are, turn your subs back on and adjust gain and freq on the amp until your subs sound good at the loudest setting. this will cause not only your mids and highs to be strong but have a nice thump with it. ive seen many people that just turn up their bass and treble and that is all they end up with. lows and highs that sound auful. dont feel like your mids have to be turned down just because you subs are picking up some of the frequencies. i believe you will get very good results by tuning them sepetately.
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My setup:
2 Punch P312D4
1.3 cu ft/speaker ported and tuned to 32Hz
PCX 2400 (1600w rms bridged at 4 ohm)
2 Punch 1 farad caps
Pioneer P650 h/u
Infinity Reference components
Infinity Kappa 6x9s
MTX 400w rms 4 channel
Power Acousik 6.5" flipdown TFT/LCD (front seat viewable)
Pyle DVD/CD/MP3 player (under driver seat)
Dynamat
Coming Soon, or Eventually:
4 15" screens (flush mounted in ceiling <maybe>)
Lots of suede (headliner, doors, dash(parts of it),
Repaint (bumper)