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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Tue Nov 08, 2011 12:54 am
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Mustang 1- fizz alert.
My MI of 10 months has now developed the dreaded fizz. I am at my wits end as it bleeds through into the signal on any of the preloaded presets, at any volume. I haven't opened fuse yet to see if changing the virtual noisegate will have any effect, but these are the factory presets which i never had issue with before.
Firmware is 1.8, is it possible to roll this back to a previous version to check if this is the problem?

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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Tue Nov 08, 2011 9:10 am
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colos wrote:
Mustang 1- fizz alert.
My MI of 10 months has now developed the dreaded fizz. I am at my wits end as it bleeds through into the signal on any of the preloaded presets, at any volume. I haven't opened fuse yet to see if changing the virtual noisegate will have any effect, but these are the factory presets which i never had issue with before.
Firmware is 1.8, is it possible to roll this back to a previous version to check if this is the problem?


This sounds different--worse--than the type of "digital aliasing" many of us have experienced with the III, IV and V. You may want to take it to a warranty center to be looked at. From what I've read, the fizz on the I and II's was taken care of long ago by a firmware update.

It would be helpful if you could post a sound-clip somewhere.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 09, 2011 1:12 am
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Hi Cormorant, the problem seems to ease a little when moved away from the laptop transformer. It looks like it could be a shielding/grounding issue somewhere in the signal chain.
Rolling back the firmwares didnt solve anything. There is still a signal bleed somewhere in the dsp, white noise which is being amplified into output. if i can isolate it to the power supply and apply filters it may help. Also looking at shielding the laptop psu.
Will investigate further today (shoe box and tin foil in hand)

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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 09, 2011 8:57 am
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Bear in mind, external noise, pc, dimmer lights, fluorescent lights and bad grounding
will make even humbuckers noisy.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 09, 2011 9:33 am
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colos wrote:
Hi Cormorant, the problem seems to ease a little when moved away from the laptop transformer. It looks like it could be a shielding/grounding issue somewhere in the signal chain.
Rolling back the firmwares didnt solve anything. There is still a signal bleed somewhere in the dsp, white noise which is being amplified into output. if i can isolate it to the power supply and apply filters it may help. Also looking at shielding the laptop psu.
Will investigate further today (shoe box and tin foil in hand)


Yes, that's external noise, not fizz. Fizz doesn't change no matter where you put the amp or where you plug it in.

Did you try plugging in the amp elsewhere in the house? Also, try turning off your laptop.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Thu Nov 10, 2011 12:35 am
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There may be sone element of interference but the main problem is as desribed in my latest post: http://www.fender.com/community/forums/viewtopic.php?f=27&t=63628.
From this It is quite clear that there is some issue with the dsp, that is not interference related. I have dug out my receipt and will be heading back to the dealer at the weekend to do a comparison with the shop flooor model, which didint sound any thing like when I took my guitar in for grounding repairs last week end.

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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Sat Nov 12, 2011 5:33 am
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I have re-arranged the studio and the artefacts have mainly gone- too much electrical/electronic noise in modern households !!!

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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Sat Nov 12, 2011 7:04 am
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OK, just wanted to report. My MIII started to fizz today, it's a very light fizz that isn't (yet?) much annoying or disturbing. But it is exactly what has been described in this post.

Just to remind the manufacturing date of the amp is July 2011 and my guitars go through a Line 6 POD X3 Live which goes in the FX loop of the amp.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Tue Nov 15, 2011 1:26 pm
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Mine also has the strange fizz sound--for me as a ES-175 clean Chord/Melody Jazz guy it really stinks because it ruins the great sound coming from the amp.

Just bought it about a month ago---the funny thing is for what I paid I still would not return it. Just wanted to say I agree with all you guys who have been ranting about it.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 16, 2011 6:18 am
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I hope someone with some engineering/electrician skills can diagnose why their amp is fizzing. I'll tear mine apart and fix it myself if I can just figure out what is going on.

It really sucks when a product is this close to being amazing - always a tragic flaw, just like a Shakespeare play.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 16, 2011 7:47 am
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Just got one yesterday... was very excited, but... it has the 'fizz' problem.

Not sure what I will do now.. I read on this thread that it looks like the fizz is more common on the III - so I may have to returm it and exchange for a II. A shame, because I love the features on the III. I guess I will try the firmware upgrade first.

I have been going around GCs around here trying out the amps, and I absolutely loved the sounds, but I tried mostly Is and IIs, and none of them were fizzy...

The fizz is a definite no-go for me, as I bought the Mustang for the 'vintage' tones, not for the heavy effect stuff.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 16, 2011 9:14 am
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Jake Blues and patrickm, what's the manufacture date of your amps? And what voltage, Jake? With enough info collected the forum might be able to figure out safe batches, assuming they exist.

aizenx: Maybe someone out of warranty could get Fender customer support to reveal the cause for self fixing purposes? :)


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Wed Nov 16, 2011 10:00 am
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After looking at the posts on this thread, I a m starting to wonder if the Mustang III has basically a design flaw:

!. the problems appers primarily on Mustang III
2. Some have it, some don't and, some appear to develop it after some time
3. It looks likes the problem is in the power section
4. Some time external conditions(power, etc...) may affect the problem

Tell me if I missed anything, but these seem to be the most common observations.

My thinking (and, for the record I am a EE specialized in analog design): a design flaw. not a DSP/firmware issues, but something marginal in the harware. Each amp is a little different due to component tolerances, explaining why some do, some don't and why even some develop it over time: if one is sitting right at the edge of trouble, a small drift in a component may cause the problem to appear.

So,that looks like a design flaw - the design is not robust enough regarding variatiosn to parts and manufacturing tolerances. I also wonder if temperature affets the proplem - does it changes when hot or cold (and this test will not void the warrenty, unless you use a torch)?

I would bet that a Fender enginner has the problem already understood, figured out and fixed. The reason Fender is unresponsive is simple: this is a logistic nightmare. These amps are mass produced, there a bench of them already sold, another bench in inventory or shipment all over the world, and parts being mass-produced by the thousands. Making even a mall change in a mass produced item is a huge issue, then dealing with inventory and returns even worse. It is very possible that the only practical solution for Fender is to fix the problem at some point, make the improvenent and not deal with the fallout (I mean the current design out there), considering this is a relatively inexpensive product.

My gut feel for now may just be to return it and get a II or even a I to play with, and wait for Fender to solve the problem, rather than mess around with a potentially flawed product.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Thu Nov 17, 2011 6:33 pm
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I'm really planning to buy one MIII, as soon as possible, but this "fizz" problem is making me change my mind.

The Fender already knows about this issue for some time (at least 6 months, so I could see by this topic), but the solution is taking too long to appear.

It's too bad.


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Post subject: Re: Mustang III - Digital Aliasing (Strange Fizz Sound)
Posted: Thu Nov 17, 2011 6:51 pm
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I bought mine two weeks ago, fizz free at beginning. One week latter I noticed the fizz behavior.
Could not reproduce it at the store, probably because it was a noisy environment. Exchand for a new one and fizz again.

Both were from NOV/2010.

Very sad, but seems to be a characteristic of this equipment. :(


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