6x9 for 04 impala w/ stock amp

[93 saturn sl2 10+ year member]

My mom has an 04 impala with the premium sound so there is an amp on the rear deck to power the speakers, and the rear 6x9s dont really put out and highs just lows and when your in the back seat you cant hear any of the lyrics so I want to put new speakers in the back. But with the stock amp I dont think that the ohms are 4. What speakers would your reccomend with the most bass??

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