Question about Marshall Amplification Marshall Haze Guitar Amplifier Half Stack with MHZ15 Head and MHZ112B Cabinet

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Every time i turn on their is a loud high pitch squeel that occurs on my Marshall VS232 amp. My volume is all the way down, and the gain channel isnt on either. What is the problem?

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If this happens when guitar cable is disconnected, take unit in for repair. This should be easy to troubleshoot. Hint: demonstrate the problem in the shop. Things have a way of fixing themselves and then lots of time is wasted trying to recreate the problem.

Posted on Mar 15, 2011

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What is causing a continual high pitched squeeling sound when the amp is turned on with nothing plugged in?


The speaker resonates with itself, reabsorbing the, little as it may be, and then amplifies it, spits it out, reabsorbs it... It goes on as long as no other input is connected.

Jan 17, 2016 | AMP Music

1 Answer

I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.


The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

Mar 07, 2011 | Marshall Amplification Marshall AS100D 2x8...

1 Answer

My new mg50fx has a ton of hiss when i turn it on. anything i can do?


Make sure the master volume is turned up and the inout gain is down some.

All of the electronic devices suffer from the statistical noise within the amplifying components. Keeping the inour gain down some tends to limit the gain where the hiss is most sensitive, that is the high gain in the "front end" or preamp section.

A "ton" is not a MEANINGFUL measure of the loudness of the hiss.

A meaningful measurement would be the Db relative to the normal program material.

Test with no devices plugged into it as the preamps in guitars can create hiss too. The hiss should be barely perceptable at 5 feet from the amp.

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4 Answers

Marshall MG50 DFX amp line out/headphones not working


Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.

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1 Answer

High pitched squeal when the input jack is used.


Sounds like your master volume is turned up too much. The channel volume will make the squealing go away(caused by high gain and humbuckers). The best thing to do is dial in your favorite presets and change the channel volume to the correct level with the master volume where you usually keep it. I use my Spider Valve at master volume at about noon and the channel volume between nine o'clock and noon. Let me know if this does not solve the problem......

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MG100HDFX Amp - crunch setting seems too loud


There are 2 channels, Which means there are 2 sets of knobs ... One for clean and one for crunch. Start out with a low master volume and set up the crunch, Then the clen and switch between the 2 and make adjustments until they match volume wise ... Then turn the master up.

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