Okay, don't quote me on this because I'm not an audio expert by any means (my friend is), but I dont think its a good idea to mix sizes of subs. ex: If you have a 12 you cant supplement with a 10. I've heard it will sound like crap or wont improve sound. It all has to do with output from your amp being the same and different size subs throw it off or something.
Someone who knows exactly what I'm talking about please correct me!
Also, two tens will probably sound better than one twelve. I'd say hold onto the twelve or install it in a friends car or sell it (rockfords'll fetch a nice price)
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