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erm ..i cheated ...i got hold of a single Bose 404. i pulled the 4 speakers out...they are 4 ohm each which were electrically fine....but are a triangle shape, they fitted with a fspacer in fronts and rears are only secure by 2 screws. they have aluminum coils.....apparently so have less diaphragm weight....
honest opinion is ...they sound a liltle mid range heavy...but they double the sound volume over all and now can hear songs with windows down at speed.
i did buy some speakers from jaycar...some duals and they where clearer....they where only marginally louder. anyway these speakers made enough difference not to bother with extra amps and higher again speaker quality$$. i have thought of adding a equalizer to flaten the overall sound but after turning down the treble and flat out on the bass she she sounds great with no distortion ...still not quite perfect but alot of improvement for next to nothing
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