The mounting holes for the Quest Marine Speaker # 292-100161 are 6-3/8" from center to center. There is not a seal of the back of the unit so I recommend using some butyl tape # AL28KV on the back to prevent water from leaking through.
We do not currently have grills available for this speaker but do offer a wide variety of speakers that come with grills if you could provide me with the size of the cutout hole you're placing the speaker in. view full answer...
Yes, Jensen RV Stereo # JWM70A can indeed use the RCA output Jensen Enclosed Amplified Marine Subwoofer # JMPSW800.
The existing speakers will still work, and use the variable output. view full answer...