it depnds on the brand of the 10's and the brand of the 12's. If you buy ome cheap brand like pyramid 10's and you buy one 1 re X.X.X 12" sub. ITll blow make the pyramids look like trash. PLus the sq will be 10 times better of the re X.X.X. Jesse tell me the brand of the 10's and the 12's. It really matters on the sub brand