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In many cars with factory sub, there usually are ways to boost the subwoofer level. Can I do that with the HK sound system? Or is the only control is via trenle/midrange/bass control?
 

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There are individual controls for each speaker inside the engineering mode. Google for it - I don't recall the crazy combo of buttons you have to hold to access it. I hopped in and changed some levels but haven't had time to tweak it ideally. FWIW, I don't suspect you'll gain much as these speakers sound like they distort if you look at them funny!
 
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