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Where is the best place to ground a amplifer in a truck without getin that humming sound

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Hi what ever location you find under 18" from the amp you must clean it down to bare metal and bolt the wire tight also rca wires are run down opposite site of vehicle then the power wires. If you still have a humming sound check the ground on the radio make sure your not getting it primarily from the antenna. If its still there you can try a noise suppressor sold at bestbuy or radio shack ect.

Posted on Feb 04, 2010

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It hums when TV ( cable ) is on.


I do see a "Signal Gnd" connection on the rear of your Sony and you can safely try a physical "chassis-to-chassis" ground connection to see if this helps. Otherwise, it could be a defective cable box as the cheaply manufactured "wall wart" power transformers are notorious for poor RF and DC filtering which in turn causes the cable box to produce a 60 cycles hum. Good luck!

Mar 21, 2015 | Sony STR-DE897 Receiver

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

1 Answer

I have Sansui G-9000, and its phono stages emit a buzzing/distorted sound even if a turntable is not connected. There is also no sound coming from the left speaker (I already tried switching the speakers,...


The Phono section has a very high level of amplification and so the audio input is very sensitive. So a possible faulty/loose grounding of the input can create a HUM which can be due to even a poor shielding of the input from stray AC factors. So you need to check for the these factors that can bring in the hum , you can confirm by isolating the phono circuit and working to the faulty stage.
Also it can be due to a faulty power supply - non filtering in DC- to the phono preamplifier.Finally faulty capacitors in power and feedback circuits can be a reason- check the negative feedback circuit which can be an op-amp with a feedback , check the capcitors here as a higher amplification can also be a reason.- check the preamp IC.

Oct 08, 2011 | Sansui Audio Players & Recorders

1 Answer

My Marshall Haze 40 Amp started making a very loud humming noise after a couple hours of playing.I let it cool down,and turned it back on and the noise came back after a few minutes


may be one of the electrolytic capacitors in the power supply has become leaky...this is a common problem among amplifiers...so you let it cool down..then after a period of time the capacitor heats up and then causes the hum...the power supply caps filter out the 60 hertz ac line noise...which is probably the frequency of the sound it is making...this is a good indication of these caps going bad....another thing you can check is to see if the amp is properly grounded(eg: the ground pin on the plug is present) and that you dont have an open cord or input

Jul 10, 2011 | Marshall Amplification Marshall Haze 40...

1 Answer

Tv works but no sound


Hello Jjwpod hi, to find where the trouble is, you need to place ear near speakers, you should hear a humming sound, adjust the volume up or down, the humming sound also goes up or down, this means your amplifier is working, no hum means trouble in amplifier.
summary:
No hum: trouble in amplifier, speaker connection.
Humming, but no audio: problem before amplification, most likely the Sound IF stage.

Sep 16, 2010 | RCA F27615 27" TV

1 Answer

I have no audio


Hello sir, Hi, No Audio on your TV can be user error or Hardware error, for the user error, make sure that the TV is not set to low volume or the setup is on MUTE, for the hardware error, Place your ear close to the speakers, then set the volume up and down several times, you should hear a soft hum that goes up or down, (make sure that the room is quiet.) The soft hum means that the power amplifier is working properly. so the problem may be on the main board where the sound is being produce before amplification, usually the sound IF section. NOW if you did not hear the soft hum, problem with the amplifier and speakers, A physical checking for open wire contact or loose connection is needed.

Aug 20, 2010 | Sharp LC46SB54U 46 in. LCD TV

1 Answer

I have an Onkyo SKW-50 subwoofer and when I turn on the power to the subwoofer, it is making a low-level humming sound. When I turn the frequency dial up or down, the sound of the hum gets louder or softer...


may be u have a power problem check if ur ground is well connected to ur amplifer and also check the input cables if there ground wires r intact and make good contact

Dec 20, 2009 | Audio Players & Recorders

1 Answer

Bad Humm out


First disconnect all inputs. If hum is still there, PROBABLY the filter capacitors have gone bad. Replacement is the cure.

IF there is no hum without any inpout cable connected, there is a ground loop and either the ground at the inout connector is broken, or your cables and guitar may have a problem.

Nov 15, 2009 | Marshall Amplification Marshall MG250DFX...

1 Answer

NAD S300 Amplifer humming


You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.

Nov 15, 2009 | NAD S300 Amplifier

1 Answer

Clarion stereo in1997 mercury marquis wiring hook up to amplifer


make sure the speaker wires in the car do not have one side grounded.the output on the clarion is a floating output and cannot be grounded.the best solution is to look at the wiring on each of the speakers,and match them out to the ones on the clarion.the most common colr code is white front left,gray front right green rear left and purple rear right.each speaker has a plus and minus.mixing them up will result in the speakers being out of phase and result in poor bass performance.i would wire the wires directly to the clarion using crimp connectors.the first thing i would do is power up the stereo out of the car to 12 volts,and using a speaker make sure you have sound coming out.the yellow wire which is the clock/memory is a must to be connected to constant 12 volts or no sound can result

May 26, 2009 | 1997 Mercury Grand Marquis

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