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What are your other factory components besides the head unit? Do you have the Bose factory amp or no amp at all for your normal speakers? What are the 4 channels of your JL Audio amp being used for?
You will want a crossover to roll off the bass on the regular speakers at the very minimum. Whether you can do that easily or not will depend on your current configuration.
Are the gain pots on the amp turned all the way up?
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