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Old 05-22-2013, 06:36 PM   #1
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Crackling sound at higher volume

Full disclosure, this has nothing to do w/ my Jeep, but as you're all smart folks, I'm hoping someone will take pity on me and help me figure this out.

I was prepping the jet ski for a trip to the lake for memorial weekend. I have customer speakers mounted, powered by a small 2-channel amp, that is fed from my IPod.

This is my 3rd year having this sound setup and it's worked great (mostly).

Anyhoo, after de-winterizing it today, I plugged in the iPod and turned on the amp, just to make sure all was well. Well, it wasn't/isn't.

If I turn the volume up too high on the iPod or turn the gain up too much on the amp, I get a crackling sound from both speakers. The speakers don't appear to be damaged as they sound find at low/mid volume.

The system worked great the last 2 summers. I was able to crank it loud enough that I could hear it going 60 on the ski.

Also, I have a spare amp that is identical to the one on the ski. I hooked it up and the same issue occurred. I also use my iPod all the time so I don't think that is the issue either. I don't see any loose connections or corrosion anywhere either.

So at this point I'm stumped.

Any suggestions?

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Old 05-22-2013, 06:56 PM   #2
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The speakers are clipping(distortion/over powered) get a new set of speakers

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Old 05-22-2013, 08:13 PM   #3
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Easier said than done. These are custom made I fit in my mirror housing

Odd that they worked perfect at the end of last summer and only now are doing this.

At least they work fine up to mid volume so I can use them for now.
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Old 05-22-2013, 08:42 PM   #4
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Any moisture that makes its way in will cause buildup on the components. Were they marine speakers?
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Old 05-22-2013, 09:17 PM   #5
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Quote:
Originally Posted by Jma20a View Post
The speakers are clipping(distortion/over powered) get a new set of speakers
If the speakers are clipping it's because they're asking more power than the amp is capable of giving. If that's the problem then you need a new amp, not speakers.

Given they worked before, I'm more inclined to agree with your second post - it's more likely a moisture / cold related degradation in the wiring and/or circuitry.
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Old 05-22-2013, 09:21 PM   #6
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They are marine grade.


Will see if I can find some spare speakers to hook up just to verify whether or not the speakers are the issues.

If the issue persists ill have to go over the wiring again.

Thx guys.
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Old 05-23-2013, 04:22 PM   #7
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Originally Posted by woansleftpeg View Post
If the speakers are clipping it's because they're asking more power than the amp is capable of giving.
you got it all bass ackwards. here is a good video in describing what clipping is. watch and learn.

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Old 05-23-2013, 04:35 PM   #8
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Much as I enjoyed the video of the man dressed as a car thief auditioning for a children's TV show, you might wish to try a little further reading yourself.

Quote:
Clipping is a form of waveform distortion that occurs when an amplifier is overdriven and attempts to deliver an output voltage or current beyond its maximum capability.
Quote:
When an amplifier is pushed to create a signal with more power than its power supply can produce, it will amplify the signal only up to its maximum capacity, at which point the signal can be amplified no further. As the signal simply "cuts" or "clips" at the maximum capacity of the amplifier, the signal is said to be "clipping". The extra signal which is beyond the capability of the amplifier is simply cut off, resulting in a sine wave becoming a distorted square-wave-type waveform.
http://en.wikipedia.org/wiki/Clipping_(audio)

What is "clipping?"

If the speakers have been damaged by the amplifier clipping (note: speakers do not clip, they simply reproduce the clipped signal from the amplifier), then replacing them and not fixing the problem with the amplifier will only result in the new speakers failing as well. Although I don't think this is what the problem is in the OP's situation anyway.
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Old 05-23-2013, 05:46 PM   #9
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You said "If the speakers are clipping it's because they're asking more power than the amp is capable of giving."

Has nothing to do with the speaker asking more for more power
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Old 05-23-2013, 10:19 PM   #10
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You said "the speakers are clipping(distortion/over powered) get a new set of speakers".

Has nothing to do with the speakers clipping, nor would getting new speakers fix clipping. In fact, clipping is the exact opposite of what you described and the way to fix clipping is the exact opposite of what you recommended.

Clipping is when the amp is being asked to deliver more power than it's capable of. That happens when the speakers are capable of more than the amp is able to deliver. I may have phrased it badly, but at least I wasn't just making stuff up.

Shall we not have this argument any more?
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Old 05-24-2013, 12:13 AM   #11
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I think the issue is one of 3 possibilities:

1. The speakers are being overdriven.
2. The amp is clipping causing the speakers to sound like crap.
3. The signal going into the amp is causing the issue.

Isolate each one on its own until the culprit is revealed. Moisture may have got in the speakers to cause the new issue. Or maybe moisture got into the amp to cause the issue. Maybe it's a combination of both. Or maybe the source or input cable is going bad. Good luck.

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