Type X is not an spl woofer.Type x might be in that area
ive had the t4 tarantula, it was loud. ( and pretty hefty) I can assume the t5 would perform just so.anyone with first hand experience with theese? they can be had off ebay for 150 shipped
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=5371