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Well I bought my car with a set of 12" Inifiniti Kappa(not the Perfects i'm told) speakers in a nice band-pass box, I took them out and I've had a friend, co-worker, and relative all wanting to buy the box/subs off of me, problem is I don't know a damn thing about car audio, I don't know if I should ask $50 or $500, what would be a fair price for both parties, its all in good condition, hopefully thats enough info for someone to give me a very rough apraisal
Someone's selling a kappa and qlogic box for 100 bucks at CL.
When selling a used electronic stuff, rule of thumb is 30-50% of the original price you paid it for.