Quote:
Originally Posted by 07vlx
I have an Alpine CDA-9886M head unit and the older version WS420. At the end of the season last year when I would link to another boat through the boat link on the 420 my head unit subwoofer eq would automatically drop to -4. After adjusting the eq on the head unit back to flat the volume of my stereo would be cut in half even with the volume all the way up. I suspect the problem is in the head unit but wanted to hear from the experts what you think and if there is a way to test which one the culprit could be or both.
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While anything is possible, if something is changing inside the HU then that would appear to be independent of the EQ.
A common thread could be low voltage. The HU is loaded with microprocessors and they get wiggy with low voltage.
So I would make sure that the HU and EQ share a good gauge + supply and a good gauge - ground that are terminated at the same points, which would be at or near the primary terminals of the amplifiers.
Then I would have a multimeter handy to check the voltage at the HU and EQ terminals (not at the battery or dash meter) real time if the problem occurs again.
Exhausted batteries have a habit of showing up with voltage issues at the end of the day toward the end of the season. If you are playing the system at rest for a long duration then you MUST supplement your boat's charging system with AC shore charging.