Question about Marshall Amplification Marshall AS100D 2x8 Acoustic Combo Amp

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Unwanted noise from all Efects settings

When using any of the effects settings, there is an unwanted noise, sounds more like 'ticking' than just hum. Everything else works and I can use the amp with the effects volume turned to 0.

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1 Answer

My Cube 30 hums when I plug my guitar into it, buzzes really loud when on effect channel, clean when plugged into AUX


You have a bad ground somewhere. Try different cables and check the effect channel port if it is tight and secured.

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When used, it seems to effect guitar amplifiers and cause a strange sort of a chorus sound, like somehow the unit is bleeding into the other amps.


it maybe interference picked up through an unsheided or poorly sheided cable or through single coil type pickups rather though the amp itself. You might also try get your power for the amps and this unit through different circuits.

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My digital effects does not work at all. It makes a noise only on the distortion setting and all it does then is hiss. Any ideas


Make sure your power supply is doing its job. check output reading w/ a ohm meter and compare it to the info on the back of the supply. i am assuming your using tje recommended power supply. if this does not prove to be the cause. you may have send it out for diagnostics and most times it's just cheaper to buy new. good luck

Sep 15, 2014 | Music

1 Answer

Possibel PSU Issue?


Could be a failing power supply as you suspect. You don't indicate the age of the equipment, but that could be a factor.

Mar 09, 2014 | Behringer XENYX 2442FX Mixer

1 Answer

Our mixture MACKIE CFX 20 give a humming sound as the clip light always on, but this does not happen before, tell me how to stop this


You say the clip light is always on, as the only clip lights on this mixer are on the effects channel and the master output and you do not say which is on there are a number of possibilities. You may have the effects turned up too far as this should not be showing, just maybe blinking, turn them down on efx2 on all strips as well as on the effects processor and see if this helps. If it does you may be able to find where the hum is coming from by gradually increasing each until you find it.

If you are getting the clip on the main mix master and you are not being deafened and the humming sound is coming from the speakers not the mixer you may have a subsonic signal getting into the mixer. Disconnect all inputs and if this cures it go through until you find where it is getting in and sort that.

If the humming is coming from the mixer it is possible that the smoothing caps on the PSU are dying, you do not say if you are getting normal sound as well as the humming from the mixer.

When asking for help please try to give as much information as possible

Sep 27, 2012 | Mackie cfx20 mkII compact mixer

1 Answer

I have a mackie cfx12 mixer with mackie powered speakers.At a gig tonight i set up as usual and had strange highly amplified sounds coming thru speakers from microphone when reverb was on-the effects had...


Make sure you are using BALANCED interconnection cables to the speakers, either XLR or TRS connections. ALSO make sure all interconnected equipment such as the speakers AND the mixer are powered from the SAME receptacle at the venue... yes you have to run extension cords... the pro's do it so they don't have hum and other noise and don't damage their equipment.

Aug 14, 2011 | Innovative Concepts Corporation Odyssey...

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Im using a behringer ucg102 guitar/usb interface, im getting a very bad hum/hiss.. i've tried 3 different guitars and multiple jacks. im not running any guitar effects yet, i've removed the...


Try this using a differeent computer. Some computers generate a lot of digital noise. Also use a lot of gain from the guitar to improve the signal to noise ratio.

Jul 23, 2011 | Behringer energyXT2.5 Plus Portable...

1 Answer

When I connect the Mackie 1642-vlz3 from the "direct outs" to the line level inputs of the D3200 there is noise/hum (except for channel 1). There is no noise/hum in the XLR inputs. I have two...


Make sure ALL of the interconnected equipment is powered from the SAME receptacle to avoid ground loops due to the safety ground. DO NOT Use two wire power or use ground lifting plug adapters. Make sure you use balanced lines, either XLR or TRS cables. Do NOT use TS cables.

Jun 01, 2011 | Korg D3200 Digital Studio

1 Answer

The bottons for my effects are not working


what doesn't work? the button itself, the efects selector knob, or the display? the more info. the better
- josh

Jan 13, 2011 | Pioneer DJM800 DJ Mixer (Warehouse...

1 Answer

I have unwanted sound when i plug in my guitar


If the "sound" is hum, then your guitar MAY be picking up magnetic interference. Humbucker type pickups tend to fight this problem.

The next cause is POOR quality guitar cables. SOME people make the mistake of using speaker type cables for their guitar instead of instrument cables.

The last thing is that ground loops can be a problem if all your equipment is NOT connected to the same power source.

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