cross over

I have 5.5 in alpine sps 610 door speakers with Kenwood ddx774bh unit. I've done all the basic things to make speakers louder. Will tuning the crossover help?

What is a built in crossover? Is it like a passive crossover where it just sets apart the high mid and low frequency notes? Help please!

Item(s) for Sale: 1-MTX RT-X02A xover 4-MB Quart 200.72 xover Item(s) Description/Condition: MTX RT-X02A xover - Good Condition MB Quart 200.72 xover - Good Condition Price: 1-MTX RT-X02A xover -$30 4-MB Quart 200.72 xover - $50 Each Shipping and Miscellaneous Item Information: Willing...

Signal Processor

Item(s) for Sale: Cadence CWM-xt xOvers Item(s) Description/Condition: Used. 6/10 cosmetic (scratches, sticky stuff on it, ) 10/10 mechanical They are the crossovers from the Cadence CWM-6kit components Cadence CWM-6 KIT - Power Max Electronics LLC Price: $25 shipped or b/o. Shipping...