Metalman56 lined it quite stable. in very fact and not utilising a sub, you will no longer have a vehicle which will "shake with track and bass" . so which you desire a sub. as for 3 way vs 4 way, it is a decision and you will be able to desire to take heed to them, its kinda like asking it quite is greater suitable the crimson vehicle or the blue one... in case you're virtually after sound high quality, i could propose getting a around speaker for the 4 important audio gadget. in the experience that your cutting-edge audio gadget are 6x9 there are adaptor plates attainable at a stable vehicle audio save to in high-quality condition a 6 a million/2" around in that area. a 6x9 will supply greater bass yet sound worse than a 6 a million/2" however the lack of ability of bass is a non difficulty while further a sub, because of the fact the bass frequencies would be "decrease off" from the mains besides, and redirected to the sub. in case you desire to start up off sluggish i could get a 4 channel amp, a sub and a pair of latest audio gadget up front, i recomend an element set with a seperate woofer and tweeter. with those factors you are able to makes use of the deck to power the rear production unit audio gadget, then 2 of the channels to power the recent front audio gadget and the different 2 channels could bridge to power the sub. this could supply finished frequency sound at a funds fee. in case you desperate to characteristic greater power and greater quantity, all factors could nevertheless be usable, merely purchase 2 new audio gadget for the back and power all audio gadget with the 4 channel amp, then upload a sparkling mono amp for the sub. in case you bypass this course, merely determine the sub can carry an excellent form of power for a destiny improve. i could seem right into a 50x4 as much as a seventy 5 x 4 amp, and around a 4 hundred-600 watt sub. this could be a great gadget without important electric powered gadget advancements.