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9857 volume problems, bass cutting out


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no matter what i do with the amps gain, adjustments, around volume level 23/24 the bass seems to cut way back. i've been doing everything i know and now i'm stumped. heres the setup.


alpine 9857 head unit


focal 165kf fronts powered by jl 300/2 amp


boston 5.25 coax i had powered by 150w alpine amp


jl 10w1v2 4 ohm in custom box powered by alpine 140 rms amp.

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I also have the alpine 9857. I still have stock speakers, but have the exact same problem. im supposed to stop by a local car audio shop with a great reputation tomorrow to seek some advice. I kinda think it might have something to do with that BBE (bass engine). No too sure though, but ill let u know

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