Okay i am confused here you say you have 4 speakers but you wish to buy a 2 channel amp. you can do this no problem but you will only be able to run one speaker per channel so you will only have two speakers running.

Your other option is see if you can mount emepg and kenwood in dash and have an input into the kenwood from the empeg.
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland