Amp For Polk db6501 & Alpine SPS-69C3 (?)

[mst3k]

Hey all,

I've recently installed some new speakers and a new HU (up from the factory sets):

Polk db6501 (100W RMS/300W Peak @ 4 ohms) in the front doors

Alpine SPS-69C3 (50W RMS/250W Peak @ 4 ohms) in the back deck

and an Alpine CDA-9886 for the HU

I have to crank the HU to get the volume I'm looking for and the quality suffers a bit (the Polk tweeters are also a little bright but I can change that on the crossovers), and I've been told an amp would be a good upgrade in general. I'm a little unsure about the best way to do this though: should I get a 50W x 4 channel amp, or would it be safe (for the rear speakers) to get a 90W x 4 channel amp? It sounds to me like either would suffice and would be a big improvement over the 18W the HU puts out. I also don't have a sub but haven't ruled it out either.

Sorry if this is a totally lame question. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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