Like stated above if it's a android head unit their voltage output for pre out is terrible. You'll have to boost it but IMO this introduces distortion and I would instead look to upgrading your speakers and an aftermarket amp.
They shouldn't have bypassed the bose amp for two reasons, 1 the tweeters and woofers don't have a crossover in between them so they couldn't have run all the speakers off 4 channels. and 2 the ohms is different then normal aftermarket car speakers.
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