So. When I do get my sub system for my car, I want the subs to play the bass, and let the speakers do the rest. My question is right now without a system, I have to set the bass on my deck to -3 (does to -7 to +7) to keep my speakers from playing bass, and when my really bassed up songs come on, I have to go to -5. My question is when I do get my system, all hooked up and bumpin, will my speakers continue to play bass? I went to a car toys rep and they said that they will and that I'll need a 5 channel amp to allow the speakers to play within their frequencies and the sub to play its frequences. Is this true? I have a Boss 612UA Deck (Don't criticize my deck, it does what everything I want it to). It doesn't have a crossover. Are there decks that have a crossover that I can set so everybodies happy? What can I do? I'd obviously prefer the most cheapest way to fix this, I don't want a $300 solution, when there are cheaper ways to do it.