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To acheive a higher SPL then the Type r setup, you would need to doubble the effective excursion of your woofers.
12's are louder because they have more cone area. 10's have less.
Sony amps are CRAP so it might not be that hard...
Your forgetting a box... unless they come in one... i cant see the auction, sealed box 2 10's get about 500-600 wrms at 12vdc , that should be loud. You would allso want to get at least 4gauge wires for your amp.
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