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I am getting a very low audio output signal, and it is distorted.

When I turn it on there is a slight humming noise,I have cleaned the pot's,and there is no scratchy sound when I turn them.Talk through the microphone, and you can barely hear it at full volume.

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Do a continuity test the full length of the wire. ZIf the wire is good...the mic is bad.

Posted on Apr 22, 2015

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1 Answer

How do I adjust the mixer to remove humming noise?


I used to be a hi-fi enthusiast many years ago.
A low frequency hum can be caused by inadvertently creating a "hum loop". This is when audio separates are earthed or grounded where they are plugged into the power outlets and then connected together using screened audio leads where the screening is connected to both plugs.
The situation can become worse when one of the separates is a type that isn't grounded.

Ineffective or insufficient power supply smoothing and/or shielding leaving an AC ripple on the DC also creates a hum or in the case of poor design or bad shielding can radiate AC magnetism into the high gain input stages of amplification.

Whatever the cause of the hum it can be aggravated by poor matching of separates with regard to input/output sensitivities and impedances. If the pre-amp stage gains have to be high to compensate for a low input signal the signal-to-noise ratio will always be poor through every stage. Small signals requiring large amounts of amplification requires low impedance circuitry and appropriate sensitivity.

Food for thought...

Mar 04, 2015 | Samson Xm410 Powered Mixer

2 Answers

Transceiver signal interference


The FT-840 uses a die-cast RF power amp with thermally switched fan to ensure full power output (up to 100 watts). The digitally synthesized local signals ensure clean, low-noise transmitter output on all HF amateur band. There might be no AC line interference. it has strong Rf output. any AC line intersect does not affect its radio performance. Check and adjust RF power so to maintain proper output. some times more RF power generated at the output may cause interference. adjust Rf power..Even some unfiltered Noise getting the other end of the end may calso cause interference. Check for any Ripple voltages present at the output. Contact authorised service station for further Rectification. thank you shanth

Dec 23, 2007 | Computers & Internet

1 Answer

There is an audible hiss/distorted noise when the volume nob is turned. is this a sign of a failing potentiometer?


its accumulation of dust particles in the POT. Clean it by pouring alcohol into the POT and keep turning it around(with power off) and it will clear

Jul 08, 2011 | Polk Audio Psw10 10" Monitor Series...

1 Answer

If the master output lights go above green (into yellow) the sound becomes slightly distorted even at low speaker levels. i have cleaned the output jacks but it is still distorted


Does the distortion ALSO appear when you listen with headphones? If not, the problem may be downstream. The driver for the mute control line to the mute transistors may have a problem. Make sure the mute is off.

Nov 02, 2010 | Behringer DJx700 5-Channel Pro DJ Mixer...

1 Answer

I have NS-2 Noise Suppressor Pedal, this works fine but in some moment make a radio noise (hum) and the output signal comes down (like turns the volume to 0) ... I don't know what it is, I'm going to...


The probable problem is poor connections at the input and/or audio output jacks.

Usually the power supply will fail either on or off which is sometimes cause by a bad input power jack.

In any case, the problem is likely internal and will require repair.

Aug 06, 2010 | BOSS AUDIO SYSTEMS Boss Ns2 Noise...

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

2 Answers

Amplifiers has a hum


The hum therefore is a generated before it reaches the volume control. Check that all the connects are good, a bad earth will cause a hum. If the hum is in both channels it will be something that is common to both. Electrolytic Capacitors are there to take out hum, so suspect them first!

Jun 06, 2009 | JVC Audio Players & Recorders

1 Answer

Distortion


One word, No.

Distortion comes from the audio signal being clipped by one of your elements in the system.

What I would do first is measure the output of the radio with an oscilloscope to see if the signal is good. If it is then I would determine if the source of the distortion is the amplifiers or the speakers.

If it is the radio have that fixed or changed, If it it not, it might be a case of the radio overdriving the Amps causing them to clip the signal peaks. check for the max signal input of the amps and make sure the system is adjusted for that.

Let me know how this turns out.

Thank you,

Shuttle83

Aug 07, 2008 | Jensen Car Audio & Video

3 Answers

1974 FENDER TWIN REVERB HAS NRE TUBES NEW FILTER CAPS AND WAS REPAIRED BY RETIRED AUTHORIZED FENDER TECH. PROBLEM AMP HAS VETY LOW OUTPUT UNTIL YOU CRANK IT TO 8-10 THEN IT SOUNDS HORRIBLE DISTORTED AND...


This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.

Dan

Jul 22, 2008 | Audio Players & Recorders

1 Answer

Distorted audio


I think the volume increasing or decreasing of you woffer box has been got damaged please change your button as quickly as possible...
Thank you..

Jan 02, 2008 | M-Audio DX4 Active Studio Monitors (Pair)...

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