Rockford Fosgate RM110D4B Prime 10" Dual 4-Ohm Subwoofer - Black 7" - 7.7" speakers What is the difference between

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Rockford Fosgate RM110D4B Prime 10" Dual 4-Ohm Subwoofer - Black 7" - 7.7" speakers What is the difference betweenRockford Fosgate RM110D4B Prime Marine 10" Dual 4 Ohm Subwoofer Marine Grade Bass, 2 Ohm Ready, Black Finish Product Overview The Rockford Fosgate RM110D4B is a black 10" dual 4 ohm subwoofer from the Prime marine range, purpose built for marine watercraft and powersport applications. The 2 ohm stable counterpart to the RM110D2B, the RM110D4B shares the complete Prime marine grade construction and weatherproofing technology of the D2 variant 100% UV