Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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When I listen to my amp with headphones the sound seems to come and go.

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I have a 250 gfx, and I have had the same problem intermittently, I have concluded that the digital fx section is to blame, as it is also responsible for the speaker modelling for the line/headphone jack, and I have also had problems with my fx section.
If you have anything in the effects loop that boosts signal volume remove it, a small boost in the loop gives the power amp in these a nice glassy sound, but seems to be (in my case at least) responsible for the failure of the fx/ emulated line out.
Also check all your leads and headphones cord, try some different headphones if you have them.

Posted on Apr 03, 2011

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Suspected Faulty PC board Dead Capacitor Or Mod Pot I would suggest returning it for an exchange the problem is your speaker will work on a regular stereo because a stereo powers the sound internally causing the magnets in the speaker to vibrate Headphone jacks are designed to pick up off a seperate circuit board with a different connection to the main board hence the no sound from the speaker.

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I can only hear one side of my headphone with the Samson S-Amp! wheni pull the headphone cable out i can hear on both ears. what kind of connection do i need to listen in stereo?


Are you using a STEREO input cable? Is the source of the audio stereo? The stereo cable will have three connections on the plug... the sleeve, the ring and the tip.

If you only have mono source or using a mono cable you will only get sound in the left headset. Pulling the plug part way out will sometimes contact both connection so you will hear both.

If your source is mon, you will need a special cable that connects the mono signal to both sides of the input plug, that is the ring AND the tip.

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I have the Simmons SD7PK. It sounds as though the speakers to my amp or through our PA system are busted. What could be causing this?


First thing is to verify your sound system is OK by running program material such as a CD at normal levels through it. If it is OK then you need to consider if your drum set is overdriving your sound system. Drums generate high pulses and can easily saturate PA systems. First thing here is to connect headphones to your drum set and listen how the set sounds via headphones. If both these tests pass muster, then your PA system may be too small to handle the drum audio. In that case, get at least a 15 inch powered monitor, preferably bi-amped to run the drums through.

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1 Answer

No sound


There can be any number of reasons for this problem - solve it diagnostically by starting with something that you know is working and work through systematically to the other end.
  1. Test a microphone on a separate amp to make sure it works okay. Check amp and speakers working. Check that all output cables from mixer to amp are working by testing separately.
  2. Plug microphone into a channel on mixer. Also plug in headphones and turn headphone volume control up.
  3. Make sure input sensitivity knob is turned up a bit (say half way) and main output faders (yellow) are up.
  4. Check that channel is turned on (little button just above the channel fader- needs to be pressed down)
  5. press pfl (pre-fade listen) button (next to button to switch channel on)- do you get any sound on main output or headphones or any indicator lights on mixer to show signal is getting that far (eitehr the individual channel metering lights or the main ones in the central section)?
  6. turn off pfl - make sure channel fader (slider) is up - normal position is ) - about 3/4 of way up. Check lights again on individual channel and main output section - any signs?
  7. Is the sub mix button for the channel pressed down - in which case you will need to bring sub mix (red) output faders up as well as main faders.
  8. If you have got signs of signal on the individual channel but not main see if the channel has been routed somewhere odd (like a subgroup of channels).
  9. Plug a working amp and speakers into one of the auxiliary outputs and use the relevant auxiliary send knob (on each channel just above the faders and pfl switches) to pan some signal to that auxiliary out - do you get anything? There is also a headphone socket for listening to the auxiliary channels (with a selector switch /knob to determine which one - make sure it is in the right position) try listening to the auxiliary output with headphones - anything? If yes the problem lies in the main output section.
  10. Check that there is not a jack plug in the insert socket (to route signal through an external effects unit) without a matching return jack being plugged in - if appropriate is relevant effects unit switched on and correctly set up - if unsure remove the insert plug to take it out of the system.
  11. Make sure any mute buttons are not switched in on main outputs.
You can download a full user manual here http://www.allen-heath.com/gl/gl2400

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I have a djm 400 and it has started producing a buzzing sound through the speakers. I can take the same speaker cables from the djm 400 and hook them up to my backup mixer and the buzzing goes away. What...


Does it buzz through cans? (headphones). Try listening on headphones (turn off any amps and speakers) on cue to each channel you use and to the master output. is it stil there? if so it's an all round earthing fault. If it's all good through the cans (sorry...I mean headphones), try it with the amp/s on again. If the buzz is back it souds like the screen on the main audio output connecters has come off inside.
It's a quick fix, but if you have never used a solder iron, take to someone who has.

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Hi I have a marshall haze15w amp and stack, the problem seems to


There are many models of Marshal amps icluding 15Watt types.

First thing to try is to see if headphones have normal volume. If they do, then the headphone jack switch that connects the speaker is LIKELY bad.

If the headphones do not have any volume, LIKELY causes are:

1. Fried output power amp

2. Volume pot is broken or has bad solder joints to the circuit board.

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My Casio CTK 4000 has a 12v power going into it, turn it on, everything powers up, but when keys are pressed there is no sound. It shows the keys being pressed, but still produces no sound. Any help...


If you have a headphone jack, try listening with the phones to see if there is sound. Many of the synths have a way to defeat the line outputs and/or onboard speakers. Sometimes the headphone jack disables the speakers...

Not knowing your configuration regarding external amp/speaker makes it difficult to give further help.

Sometimes there is a mute button and of course the volume control.

Do look at the volume control and see if it MIGHT have been damaged as it likely passes the audio directly. The results of the test with headphones though is important!

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Have amp only 2 months & clean channel is muddy. it was clean when i bought it. its somewhere in between clean & drive


Test if the sound is clean using the headphone jack.

IF IT IS CLEAN in the phones, you have probablydamaged the speakers with excessive volume causing the voice coils to rub the pole pieces due to heating. If you can reach the cone either front or back GENTLY push on the cone and listen for ANY rubbing noise.

There are also electronic component problems that can cause this IF the headphone test is also muddy sound.

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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

Peavey minx 110 no sound from main speaker but headphone jack is ok. speaker wires are attached ok.everything on the board appears to be in good shape.amp powers up and all controls work great through...


Inside the headphone jack is a built in switching mechanism. It is there to cut off the sound to the speaker when you are using headphones to practice quietly. For some reason or another it seems as if this is no longer working correctly. One of the causes of this can be bad solder joints on the circuit board where this jack is located. Another cause is a failure of the jack itself. If you are capable, Take the circuit board out and have a look. Hope this helps.

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