Afraid I may have limited my options with what I've already installed

[kfinn360]

Me: New to car audio and afraid I may have limited my options with the parts I've already installed.

Goal: To have a decent setup that sounds better than factory w/o breaking the bank or rattling every window within 1/2mi radius.

What I've got

• Car: 2002 Mazda Protege Sedan (6X9s in rear deck, nothing in rear doors)
  
• HU: Kenwood DPX500BT
  
• Front: Memphis 15-PR572V2 (2 way coaxial 5X7s 40RMS/80Peak)
  
• Back: borderline blown factory 6X9s in rear deck that need to be replaced
  
• No amp or sub yet
  

Tentative Plan: I'd love to get decent (not amazing) bass out of a good pair of 6X9s in the rear deck powered by an amp instead of doing a sub in the trunk. I'm looking at the Alpine SPR-69 to accomplish this. However, my dilemma is that the front speakers are 40RMS/80Peak while the rear would be 100RMS/300Peak. What amp configuration would power both sets of speakers so the 6X9s produce good bass and the front 5X7s don't get blown or drowned out? I realize in retrospect I probably shouldn't have gone with coaxial in the front and am not sure what to do w/this setup. Advice is much appreciated!

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[mylows10 5,000+ posts]

do a 6x9 sub in the rear ,then either get a 4 channel to run all the speakers .or a 2 channel for just the rears

 

[kfinn360]

If the two sets of speakers were close to the same RMS I'd get the 4 channel for sure. My problem is a 50W would be ideal for the front while 100W would be best for the back. Should I do two separate 2 channel amps? Even if it did that, would the rear speakers with twice as much power drown out the front unless I turned the fade away from it? Sorry if I'm asking noob questions. Just trying to wrap my head around this subject many of you seem to know so well.

 

[mylows10 5,000+ posts]

you can get an amp that does the same power all around ,just turn the gains down n the fronts ,also the front will seem to be louder because they are closer to your ears than the rears .but like i said some 6x9 subs for the rears would be ideal .any on the vendors can help you with picking a set ,but a budget will be needed to recommend and speakers .