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FYI the MazdaSpeed6 comes with the Bose system which uses 5.25" speakers in the rear doors. They're mounted into a plastic combo rain shield/6x8 adapter to fit into the 6x8 opening in the plastic inner skin. You might be able to find a MS6 owner willing to part with his adapters if he's upgraded to 6x8 speakers and no longer needs them and doesn't want to hold on to them. Using these helps to retain the rain protection as it's built into the adapter. Try posting a WTB in the Buy/Sell forum.
The only drawback I can see from using these adapters is that they're plastic, meaning they would allow some flex, dulling transient response, compared to ones made out of wood. However, if your inner door skin is plastic, like the MS6, this isn't much of an issue, as the wood 6x8 adapter would still be bolting to plastic, so that would still flex. Ideally the speaker should be bolting to as solid a surface as possible. Most cars have the speakers bolting to the metal inner door skin, but not the Mazda6 or MS6.
The only drawback I can see from using these adapters is that they're plastic, meaning they would allow some flex, dulling transient response, compared to ones made out of wood. However, if your inner door skin is plastic, like the MS6, this isn't much of an issue, as the wood 6x8 adapter would still be bolting to plastic, so that would still flex. Ideally the speaker should be bolting to as solid a surface as possible. Most cars have the speakers bolting to the metal inner door skin, but not the Mazda6 or MS6.
