Noise through speakers - head unit?

[davondet]

Boat developed a winding noise through the speakers end of last year. It actually increases when the motor is rev'd up.

If you turn off the head unit, it goes away. I have an amp with built-in bluetooth and with the head unit off, it sounds great.

Is this always a head unit issue or something else?

2006 MP 5.7L engine - CMD6 Clarion head unit.

Thanks!

[chpthril]

Boat developed a winding noise through the speakers end of last year.

I have an amp with built-in bluetooth

When was this amp installed, in relation to when the noise started?

[surfidaho]

Check your grounds. Do the amp and the head unit share the same ground?

[davondet]

When was this amp installed, in relation to when the noise started?

Now that I think back, the old AMP went out. Installed the new PYLE bluetooth AMP. Seemed to work fine a few outings, then this noise developed.

[davondet]

It appears to be a grounding issue. I don't believe they share the same ground from what I traced back. However I ran a quick ground wire to the head unit and noise went away. I plan to make sure the ground wire is properly routed! Thanks!

[davondet]

Check your grounds. Do the amp and the head unit share the same ground?

It appears to be a grounding issue. I don't believe they share the same ground from what I traced back. However I ran a quick ground wire to the head unit and noise went away. I plan to make sure the ground wire is properly routed! Thanks!

[davondet]

I grounded the head unit to the battery. It took most of the noise out. Still a little left. The amps share a ground to the battery, however only the rear speakers make the sound. Any additional ideas?

[chpthril]

If this boat had an amp from the factory, is the head unit's yellow constant B+ still piggy-backed to the amp's B+ cable? The head unit GND would have also been there, with the amp GND.

[davondet]

If this boat had an amp from the factory, is the head unit's yellow constant B+ still piggy-backed to the amp's B+ cable? The head unit GND would have also been there, with the amp GND.

I am guessing the CMD6 and old Pyle 3000 watt amp was put in the boat by the previous owner. When the amp went out, I just put in the same amp, just BT version. Just connected the wires in the same spots.

The amp has a blue remote wire from the head unit to switch it on.

[chpthril]

A Clarion CMD6 would not be the original head, nor would a Pyle amp, so sounds like all aftermarket. No telling if any of the cabling is wired correctly.