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Post subject: Re: Aux In noisy!
Posted: Fri Aug 29, 2014 5:31 am
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Quote:
high pitch noise ... some sort of ground loop

A ground loop wouldn't cause a high-pitched noise. A ground loop would be a low-pitched hum or buzz. Something else (or additional) is going on here.

Even though you say the same PC and cable work fine when plugged into other units, have you tried using a different cable into your Mustang, and if possible using a different PC?

Or, have you tried using the same cable to connect a (known to be working perfectly) MP3 player, iPod, etc, into the Mustang's aux-in. Does that cause any noise?

Where are you routing the cable? Keep it well away from all power cables, guitar cables, digital cables (network, phone line, etc). Also keep it well away from any other cables connected to any other musical equipment, particularly any cables carrying digital signals.

Have you tried plugging the same PC and cable (that causes noise with your Mustang) into a different unit since this problem started occurring? Are the other units still silent?

If you insert a unity-gain buffer pre-amp in between the PC and Mustang, does that cure the noise?

If you connect the PC's aux-out (using the same cable) to the aux-in on a normal audio hi-fi unit, do you hear any noise through the hi-fi speakers?

Quote:
My PC is a desktop computer so the youtube video is not relevant

Well, it's relevant in the sense that isolating the ground loop is what you're trying to do, so any options you have for that with any computer, desktop or laptop, are worth considering. Have you tried simple things like changing which wall sockets the various components are all plugged into? Slightly more advanced would be to try a power conditioner, UPS, etc.

Can you get access to a laptop, even temporarily, to experiment whether you still get the noise with a laptop running on its batteries rather than mains power?


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Post subject: Re: Aux In noisy!
Posted: Fri Aug 29, 2014 5:58 am
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Joined: Wed Dec 25, 2013 12:28 am
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Scott - I appreciate you help!

Quote:
Even though you say the same PC and cable work fine when plugged into other units, have you tried using a different cable into your Mustang, and if possible using a different PC?

Or, have you tried using the same cable to connect a (known to be working perfectly) MP3 player, iPod, etc, into the Mustang's aux-in. Does that cause any noise?

Yes, as I wrote earlier, connecting my phone to the aux did not cause any noise.
I did try a different cable that gave the same noise.

Quote:
Have you tried plugging the same PC and cable (that causes noise with your Mustang) into a different unit since this problem started occurring? Are the other units still silent?

Yes, I rechecked just now - silent.

I can try connect a laptop, don't know if I will be able to try the other suggestions about the unity-gain buffer, hi-fi, or a different PC.

I guess it can be solved that way or another, I hope I'll will succeed eventually. But at the same time I think the aux input in the mustang floor can improve. The test of connecting other unit pretty much proves it, that's my uneducated electric science opinion...


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Post subject: Re: Aux In noisy!
Posted: Sun Aug 31, 2014 8:08 am
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Got it! The mustang floor comes with a power cable that has 3 pins at the end that goes to the outlet. 1 pin for ground.
When I used a cable without a ground the noise was gone.
Still haven't checked what happens if I connect the floor to a different outlet, maybe it's because the pc and the floor are on the line from the main electronic board...
Anyway, I got the idea from the power supplys of the other mfx units, which don't have ground. Decided to try that and it worked. I like the sound of silence ☺


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Post subject: Re: Aux In noisy!
Posted: Tue Sep 02, 2014 8:47 am
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Hi arch23,

We tried several testing scenarios here where we connected a standard PC to the Aux in on a Fender® Mustang™ Floor, along with an unbalanced 1/4" output to purposely try to create any possible noise. We were not able to cause any noise to occur on our end.

Perhaps you could list the exact way you are connecting your Mustang Floor to the other various equipment? This may be helpful in gathering clues as to the specific cause of the noise. So, for example, are you using the XLR outputs or 1/4"? And what exact type of input are you bringing the output(s) to? Is it a instrument or line level input? And lastly, are you using built-in audio hardware to output audio from your PC? It would likely be helpful to clarify this information. Thanks much.

Best Regards,

Alan

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Post subject: Re: Aux In noisy!
Posted: Wed Sep 10, 2014 11:16 am
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Alan,
Kudos for you efforts!

Here are some more details:
230V
connected to the MFloor - Headphons as output, guitar through cable to input, aux in from the headphone out of the pci sound card in my desktop.

As I mentions - 97% of the noise is gone now, after I changed the cable power of the mustang to one without a ground. I still here some but it's pretty neglect-able...

Thanks


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Post subject: Re: Aux In noisy!
Posted: Wed Sep 10, 2014 11:34 am
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Joined: Thu Jan 21, 2010 1:12 pm
Posts: 4396
Hi arch23,

I am happy to assist. If I understand correctly, at this point you have un-grounded your Fender® Mustang™ Floor. This is not something that we ever recommend. I would suggest instead that you try using your Mustang Floor with your laptop. And when doing so, try the laptop without the power supply/charger connected. Please let me know what the outcome is. Thanks very much.

Best Regards,

Alan

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Fender Musical Instruments Corporation
TSL@Fender.com
(800) 856-9801


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Post subject: Re: Aux In noisy!
Posted: Mon Jan 26, 2015 5:04 pm
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Joined: Wed Dec 31, 2014 12:39 pm
Posts: 287
Location: Sackville, New Brunswick
I noticed that when I plug my iPod into the AUX jack, it sounds fine when running on battery power, but I get a 60 Hz hum and noise if I have the iPod also connected to a charger unit.
It so happens that I have an old Hammond isolation transformer (similar to the one below) and plugging the charger into the isolation transformer fixed up the noise issue.
Image
That's all well and good, but it's not practical to move the Hammond xfmr around between the TV/DVD setup, the computers, etc.

What you need is an audio isolation transformer like, say, this one:
Image
$36.99 Seems kinda' pricey, but I guess they just don't have the mass market appeal that would permit cheaper prices.
I'm guessing it's got something like this diagram inside it, except for the type of mechanical connections at either end.
Image
Notice that there is no continuity between the two ends, and it is totally passive (no devices to require a battery).
Thank you, Sonifex, for the image. http://www.sonifex.co.uk/redbox/rbpl16_ld.shtml

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