Audioholics - The VTF-2 mk5 #Subwoofer from HSU Research is the least expensive sub to capture our “Large” room size recommendation. >>> Click here to read our review! goo.gl/qwHAhU | Facebook
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Hsu Research STF-2 Power Subwoofer Photo #2874014 - Canuck Audio Mart
The Best High-Performance Subwoofer | Reviews by Wirecutter