Originally Posted by xstarrider
It had to do with the fact the mounting area on the alpha z was not flat.
This is absolutely the problem...
Mini update though: dropped the speakers after a phone chat with the dealer's stereo tech I dropped the speakers, tightened the mounts as hard as I could, and re-attached the speakers. I reduced the shake to a normal level by tightening, got the speaker that had failed working again, ticked the boat over to make sure that the speaker was working ( though i discovered there was a broken pin in the speaker mount's plug) and voila, my syn 6 started up perfectly after throwing a "DC offset" code.... So I went wakeboarding
While I was wakeboard the screws backed out so I am seeking a permanent solution, perhaps some kind of urethane bushing. I don't think it was a botched install just had a rough ride down from the dealer, I told him to drop the speakers before delivery of boats...
I really like the look of the mounts as well as the ability to drop the speakers, I leave my boat on a lift at the lake house, when I leave the house for more than a night it will be nice to remove the speakers from weather and just hide them in general. I hope I can get these working properly