Massive Audio HIPPO XL "R" Se ries H152XR. Why the H152XR Is a Favorite 15" Dual 2 Ohm Hippo XL "R" Series Subwoofer. The Massive AudioH152XR is a top-tier15” subwoofer that excels inhigh-output installations, perfect for those who need powerful bass and want to hit the low notes with clarity.
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