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Holman J.B.F
10-03-2007, 08:39 PM
08 x-star.
took the boat out today for her maiden voyage.When i put the stereo on while underway you can hear a high pitched noise comming out of the speakers that goes up and down with the engine revs.
I haven,t looked into it yet,but if it is a common problem and somebody knows were to look for a bad connection or ground issue i would apreciate the tip.

TheOneandOnly
10-03-2007, 08:44 PM
Probable ground issue, I noticed that while demoing an x2 a month... I wouldnt even mess with it since its soo new Id have the dealer find it.

JimN
10-03-2007, 09:06 PM
Get a piece of wire and connect the shield of the RCA output to the radio chassis. If it goes away, it's a grounding issue. If it doesn't, it's being radiated and the shielding isn't adequate, so you end up hearing it. Also, look at the input sensitivity controls on the amp(s). If they're turned up completely, they need to be set properly. Ideally, there shouldn't be any noise at all, but there are many causes. With the key OFF, turn the volume down completely and listen for noise- if the hiss is very noticeable and you don't need to be close to the speakers, the sensitivity controls definitely need adjusting. There are quite a few threads on this topic and I have listed the easiest way to get them close to optimum without having to use an oscilloscope (the best way).

If the audio cables are bundled with all of the power wires, that needs to change. They can come close to the power wires but noise will be induced unless the intersection is at a right angle. or close to it. If the head unit and amp are close enough, you can disconnect the head unit's ground at the dash and then run a wire to the amp's ground terminal, joining the other end to the head unit's ground wire and attaching both to the head unit's case.

Chief
10-03-2007, 09:31 PM
Distributors use to have filters to block the whine also. I'm not sure if these new engines still incorporate a small capacitor to filter the noise.

JimN
10-03-2007, 09:45 PM
Those filters (screw-onto the coil wire) were OK if the problem was radiated noise and it was only a head unit in the system. When an amp is installed, it's usually a grounding issue and that kind of filter will do bupkis. Ground loops are the problem, in most cases. The other problems usually have to do with running audio cables parallel to power wires and the sensitivity controls being too high, as I mentioned.

RK@UST
10-03-2007, 09:51 PM
I saw four words ( characters) and stopped.

Stereo problem 08 XStar

One word only DEALER

JimN
10-03-2007, 10:02 PM
If I had this problem and it was a new boat, the first thing I would do is ask the dealer if the person working on it actually knows a lot about audio systems. If they immediately say yes, ask for info on that person. Otherwise, they'll waste a bunch of time, may screw it up worse and the process would need to start over. I'm not saying this just to dump on dealers but audio systems are not very tolerant of ground loops. Some things act weird when they have a problem but this will sound bad, may damage the speakers and amp by being set wrong and when I hear that the person working on it "is good with these things", I just want to leave. They don't spend much time at the training classes dealing with the audio systems and AFAIK, no time actually working on them and this is kind of understandable, since they're selling boats, not stereos. Still, it's a boat accessory, so it should work properly.

I do agree that it's a warranty issue, though.

RK@UST
10-03-2007, 10:07 PM
If I had this problem and it was a new boat, the first thing I would do is ask the dealer if the person working on it actually knows a lot about audio systems. If they immediately say yes, ask for info on that person. Otherwise, they'll waste a bunch of time, may screw it up worse and the process would need to start over. I'm not saying this just to dump on dealers but audio systems are not very tolerant of ground loops. Some things act weird when they have a problem but this will sound bad, may damage the speakers and amp by being set wrong and when I hear that the person working on it "is good with these things", I just want to leave. They don't spend much time at the training classes dealing with the audio systems and AFAIK, no time actually working on them and this is kind of understandable, since they're selling boats, not stereos. Still, it's a boat accessory, so it should work properly.

I do agree that it's a warranty issue, though.
You know , that is a very good point.
The systems in these boats need to be right.
There are specialist for this matter. I think my dealer uses a local electronics shop to do their work, and they are good.
Just go through the dealer if it's new so they can help.

JimN
10-03-2007, 10:12 PM
You made a good point, too. A dealer needs to recognize their limitations and if they don't have anyone who can set up a system like this efficiently, they need to farm it out. They can get training when it's slow, but they should have someone who is trained in this stuff. Not only does it keep the boat from leaving their shop (especially when the customer hasn't been told), it also males accessory sales and installation a possibility with fewer problems.

TheOneandOnly
10-03-2007, 10:15 PM
What gets me on this is we just noticed this on a new 08 demoed x2 so it sounds like the way their wiring them isnt good...

JimN
10-03-2007, 11:24 PM
Wiring, or maybe someone thinks the input level controls should always be maxed out. That will definitely make small noises into big noises. They weren't having big problems last year and I seriously doubt the way they're wired has changed unless the people doing it have left and the new ones aren't up to speed.

Holman J.B.F
10-04-2007, 03:18 AM
sensitivity screws are not al the way open.
JimN
Thanx for the info so far i,ll check that wire trick.
P.s is that Gibson a tigerstripe?I have a "81 les paul custom.

JimN
10-04-2007, 08:04 AM
It's a fairly new Gibson relic, I think it was made to the '59 specs and it's not mine. Someone I know did the guitar tracks for a Tom Wheeler book about Fender amps called The Soul of Tone and that's one of the photos for the book. He used my amp, a black face Super Reverb and a black face Vibrolux that day.

djhuff
10-04-2007, 08:26 AM
This is one reason why I order my boat with no head unit. I can put what I want in there, and wire it up the way I want to. Makes it so you don't even have an option to get in and crank it... You have to start from scratch and set it up properly.

JimN
10-04-2007, 08:41 AM
If you look hard, you won't really find many threads about how bad the stereos sound on MC boats. It's just an occasional one, like this. Hardly a trend. Plus, if you could see the demographic of MC owners, you would know that A) most wouldn't install a complete system even if they could and B) most don't know how and don't really want to know how to.

The noise problem could be as simple as a bad head unit or amp. It could be a pinched wire or a bad audio cable. It's not the end of the world but should have been caught by the dealer. Makes it seem like they didn't test all of the accessories before delivery.

"You have to start from scratch and set it up properly."

Do you have a "radio delete" option when you buy a car or truck? I think not.

djhuff
10-04-2007, 09:38 AM
Do you have a "radio delete" option when you buy a car or truck? I think not.

But I wish I did, nice of MC to give me that option.