Harmony Audio HA-R104 Car Stereo Rhythm 10" Sub 500W Single 4 Ohm Subwoofer New Harmony Audio HA-R104 Car Stereo Rhythm Series 10" Sub 500W Single 4 Ohm Subwoofer. The greatest enemy of a car audio subwoofer is heat which needs to be quickly dissipated for a sub perform correctly and is crucial to prolong the life of the subwoofer.
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