Question about Parasound A 23 Amplifier

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A23 AMP THIS IS MY SECOND A23 THE FIRST STARTED TO HUM AFTER 10 MONTHS TRIED ALL USUAL THINGS CABLES SEPERATE MAIN FEED STILL HUMS SENT IT BACK, WAITED 5 MONTHS FOR REPLACMENT ARRIVED 10/08/07 SET IT UP AND YES IT HUMS ANYBODY ELSE HAD THIS PROBLEM.ONE WAS LISTED ON EBAY WITH SAME PROBLEM THANKS GUYS

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If the amp hums with just speakers connected and no inputs. The problem is internal and Parasound should take care of it under their usually prompt warr. service which is still in force. 5 months sound odd. Was your dealer getting it or was it direct? If not them connect one component at a time, add preamp next(nothing connected to it). If it hums them use a 3-2 ground lifter on the AC cord of the amp and do not connect the wire to the outlet screw. If not them connect each component. If you have cable very often this will cause hum even if you are not listening to cable sound. Use a ground isolator in line with the cable RF input.

Posted on Aug 27, 2007

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Have Simmons SD9K drum kit. Started having a hum. Tried thru head phone or Mackie board. It still hums. Pulled each cable to drums or cymbals and it still hums. Anyone know what is causing this.


The hum is likely to be the sound of the ac mains electricity, either because the power supply smoothing has become ineffective in the amplifier or one or more of the audio peripherals or because the audio connections to the input of the amplifier have created a hum loop that is picking up the radiated energy from the mains supply and feeding it into the audio input.

Multiple grounding is often the reason for a hum loop. This is where an audio peripheral is not only grounded through the supply cable but is also grounded through the screened audio lead.

If the hum persists when there is no inputs connected the problem is almost certainly power supply related, otherwise it is likely to be a peripheral that has a faulty power supply or the culprit is a hum loop.

Hi-fi officianados have a number of tricks to deal with hum loops and google could lead you to these.

Grounding is an important safety consideration so appliances that are intended to be grounded must continue to be grounded but the loop could be broken by using special audio leads. The usual lead would use the screening as a conductor and so the screen must be connected both to the peripheral and to the amplifier.
A better lead uses an extra core conductor and the screen then becomes just a screen and is grounded only at the amplifier end and is not connected to the peripheral.

I hope this helps.

Sep 10, 2016 | Simmons SD9K Electronic Drum Set

1 Answer

Bose av18


Hum is tough. It is often caused by quite a variety of things. First, address the basics:
1. Make sure that none of your signal cables run near to power cabels.
2. If possible, feed all power from the same receptacle.
3. If your plugs are not polarized, try reversing one at a time.

If none of those basic checks uncovers your demon, verify the path of the noise by disconnecting the signal from the preamp at the input to the sub. If is still hums, then look closely at the power feed to the sub, More likely, the hum will stop (along with the music.) In this case, try breaking the shield ground at the sub input (e.g. with a ground isolation adapter.)

You should also confirm that the hum is limited to the sub. Subs tend to exaggerate hum because playing signals in the 60Hz is their forte. So with the sub turned off and bypassed, listen for the hum in your main speakers. If it is there, too, then start checking your sources. Remember, even a source device other than the one selected for play could be the source ... completely disconnect each source at the preamp to track it down.

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1 Answer

Velodyne dps 10 rca hums but wired is fine


The issue a floating ground that causes the hum you are talking about. What are you connecting it to that causes the hum?

Jan 07, 2014 | Velodyne DPS-10 Subwoofer

1 Answer

Mackie DL 1608-1 channel hums w only 1 guitar


Generally the hum is one of two things. If a sensor, pickup, per-amp, or mini-amp are too close to the receiver or speaker, Feed-back may occur or a hum and buzz join the audio signal out. The usual problem is: line in port on the instrument can be defective or the male jack is not making proper contact. If a cord is tested and working, the condition is in the input on the instrument. If a terminal has a loose wire inside the instrument the problem can be intermittent ( come and go) and thus a buzz or line noise may be present.

Dec 15, 2013 | Audio Players & Recorders

1 Answer

My sansui qs 1 immediatly stopped working and alll it does is hum can not find any burnt components


Good day sir, there are several reason why the amplifier hums, but lets go to the common ones,
  1. The main power amplifier is defective. Does the volume control affect the loudness of the hum? If no, possibly replace your main amplifier IC. if its transistorized, check the two push pull amp. for shorts.
  2. If Yes, check for shorted audio cables. just maker sure you are using a good audio cable. or
  3. The pre-amp IC is defective, usually op-amps. try replacing them one at a time. these requires unsoldering and soldering.
  4. If you want to find the faulty part, you may need to trace a signal, you may need the folowing, an audio source, sine wave generator, an oscilloscope, or a portable amplifier. This method requires you to be techie. Feed the input with the audio source (disconnect first the speakers so that the hum will not bother you.) check the output of each stage, from preamp to power amp. identifying where the heck the signal dissapper. and where the start humming appears.
The third one requires a lot of work, just bring it to a service center.
Hope this helps, feel free to ask again, let me know your progress. Thanks

Jul 27, 2009 | Audio Players & Recorders

3 Answers

60 HZ hum


Rita's Vintage Audio Repair is a Bob Carver Company & can repairs & updates Subs at a reasonable cost try calling them.

May 05, 2009 | Sunfire True Sub MK II Subwoofer

1 Answer

Hum coming from speakers


Faulty wires/ connections are the usual cause of hums on speakers. Try checking if the wires are properly connected. If it still hums, try replacing the wires with a known good wire.

Nov 20, 2007 | Audio Players & Recorders

3 Answers

Logitech Z-680


You need a 2 Amp Slow Blow fuse. 250V. Available from eBay

Aug 01, 2007 | Logitech Z-680 Speakers and DVD218 System

1 Answer

Dishwasher fill with water then just hums


the hum is probably the main pump powered up but not turning. the pump is an induction motor and a usual fault is the motor capacitor. try to access it, find the value of the capacitor and replace. it is a cheap part

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