One thing to check is to make sure one of the connections didnt come loose. These are a dual voice coil speaker and have dual connections. If you loose connection on one side it will lower the volume output.
trying to build an enclosure for three of the 800 series 12s need all the specs off the spec sheet...
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trying to build an enclosure for three of the 800 series 12s need all the specs off the spec sheet for one of these subs
well one of the ground was broke loose and sound static like sounds even when i hook up the other...
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well one of the ground was broke loose and sound static like sounds even when i hook up the other voice coil and it keeps my my amp red light come on