How are these 15"s?

[Night_Rider]

Memphis 15-PR154D - Memphis Power Reference 15" 450 Watt DVC Subwoofer

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=2146

Rockford Fosgate RFP4815 - Rockford Fosgate 15" HE 400W Sub

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=2264

MTX T4515-44 - MTX 15" 500 Watt Dual 4 Ohm Subwoofer

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=2168

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