4 channel to run my Crystals

[klepto 10+ year member]

Im looking for a good 4 channel amp to run 2 sets of Crystals. I will be running the SSCS615 in front for sure, and most likely the ssx-570 out back. I know the RMS for the SSCS is 100watts at 4ohm, and the ssx-570 is 75 watts at 4ohm. Would it be safe to run these at the same RMS off of one amp or would it be better to go with a set of ssx-615 in the back, having an RMS of 90watts, much closer to the 100w RMS of the SSCS. I want a full stage in my hatchback, so thats why i am putting speakers in the back as well, but will 2 sets of 6.5's overpower it? Thanks.

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