Not difficult, though in my case I already have some kenwood 6" woofers in the lockers
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(facing forwards, so it was a little tricky getting enough cabinet volume.
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I prefer the smoth response of infinite baffle cabinets so I made up sealed mdf boxes with the focals facing upwards.
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I unscrewed the locker lids, cut along the plastic hinge line and screwed the hinge part back in place.
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That gives a flat lip all round for the boxes to seat onto.
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In cross section the boxes are like an inverted top hat, the brim replaces the original locker lid.
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I lined the boxes with carpet tile and wadding, covered the tops in maplin speaker cloth, and used some maplin grilles over the speaker cones.
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My cd changer is mounted on the passenger side box and the focals are driven by a phillips DAP 300 amp
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(just fits under the drivers seat after cutting a hole in the carpet) via a kenwood parametric graphic.
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Rest of the system comprises Pioneer premier
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head unit, Pioneer tuner
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(passenger side tunnel under the carpet), DAP600 amp for the main speakers
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(under the passenger seat, hole in carpet
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+ raise the seat 2 mm with washers!), Alpine component speakers in the doors, JBL GTO 5.0 components set into the shoulder positions
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(surface mounted with the magnets just fitting into the holes where the original speakers were), JBL tweeters on the trim accross the back window, crossovers in the doors amd rear quater pannels, and lots of dynamat.
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It's all been a tight squeeze!
I have gone for a quality of sound rather than huge bass, and I'm realy pleased with the results, and I can stillfit the T-Bar glass in behind the seats!