Sounds like you wired your speakers in series which dropped the ohms rating sending your already crappy stock amp inside the radio into a crazy mode, or you have a bose system?
Anyway you dropped the ohms rating hence why you can only get to volume 7. you're only suppose to put a 4 ohm load on a radio and most speakers come that way. What you should have done is bought a component speaker set and put the tweeter in the dash, woofer in the door, and used the crossover that it came with.
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