Question about Definitive ProSub 1000 10" 300-Watt Powered Subwoofer - Matte Black

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I hear a whistle sound on my DefTech ProSub 1000 as soon as I plug in the power. Audio cable doesn't even have to be plugged in, just power.   It worked fine for two years before this problem.

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I have an older model Harman Kardon AVR and have started hearing humming from the speakers that are attached to it. Is my receiver going bad or is there something else I need to do to fix this problem?

you may have a bad Earth power 110 V AC cable connection which makes such hum / buzz even nothing connected..
Check the connections between components and make sure they are secure before proceeding to the next Step. Sometimes, loose connections can cause a hum.
  • Separate the audio cables from the power cables; electromagnetic interference from the power cables can cause stereo hum. Use cable ties to secure the audio cables away from the power cables.
  • Plug in a surge protector to the outlet, and then plug all the components into that surge protector
  • Connect a ground plug to the surge protector and then plug the ground plug into the main outlet. A ground plug is available at any hardware store, and turns a three prong connection into a two prong. Ground plugs help eliminate 60 cycle hum.
  • 5 Connect the ground wire from your turntable to the ground wire connection on the receiver. If this doesn't work, looking on the back there should be a grounding point,

    Unplug your receiver.. Split a wire and attach one of the splits to the receiver where you will see the text, "ground" or something similar. Attach the other end to something metal such as a pipe that goes into the ground. Secure with electrical tape. Plug in.
    connect the ground wire to a screw on the electrical outlet.

    Read more: How to Fix a Hum on a Stereo Receiver '

    Take care and please remember to rate "AS THUMBS UP" Thanks
  • Jun 20, 2011 | Harman Kardon AVR 85

    1 Answer

    Radio just makes whistle sound doesnt matter if mic hooked up or not same with antenna,worked great when bought lasted 2 days had fixed 2 days again had fixed again worked 1 day as soon as you turn on...

    What type of power source is it hooked to? straight to car battery or some other power source? Sometimes cart alternator noise is picked up by radios. Try hooking the power source up differently

    Mar 19, 2011 | Connex Radio Communications

    1 Answer

    Have an older (6 + Yrs) VX-10A model, that's worked fine up until now. I recently moved, hooked up the same stereo and surround sound speakers, which worked fine, but the subwoofer made a loud hum as...

    Disconnect the input and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

    Mar 03, 2011 | Velodyne VX-10 Subwoofer

    2 Answers

    I have a marantz 2325 receiver. When I turn up moderate volume it starts making a whistle sound. When I take loudness switch off I can turn it up a little more then it makes whistle sound..Any suggestions?...
    The symptom you describe could be a failing filter capacitor. It appears to be a common problem with this unit. The above link is a source of replacement parts, and or assistance in getting it repaired. Increasing the volume increases the voltage in the amplifier output circuits, which increases the stress on the filter capacitors. If one is breaking down it could cause a harmonic oscillation that would be a whistle. Hope that helps.

    Nov 25, 2017 | Marantz Audio Players & Recorders

    1 Answer

    I have a pro-sound 1000 which keeps blowing plug fuses Can you let me know what fuse should be in the plug as this maybe the problem

    The fuse in the power plug is there to protect the cable. The fuse in the plug should be the same as the cable. For instance a 5amp cable should have a 5amp fuse. If the fuse blows all the time the cable could be faulty or there could be an overload in the power supply (perhaps the transformer has failed) that is causing the supply to draw more amps than the cable and fuse can cope with.
    WARNING fitting a fuse higher than the cable rating could cause the cable to overheat and catch fire!

    Mar 07, 2010 | Audio Players & Recorders

    1 Answer

    Subwoofer with screech and static

    This sounds like the output stage of the subwoofer amp has failed -- needs service...


    Aug 22, 2009 | Definitive ProSub 1000 Subwoofer Speaker

    1 Answer

    No sound from monitor speakers. Worked fine for 5 years. Can hear sounds when using headphones plugged into CPU. Hope you can help even if only to tell me I need a new monitor. Sincerely Dizzyme.

    First of all, check if your audio cable are still plugged into the monitor and pc output (light green) audio jack. If not just plugged it back in... Still still got no sound... Then turned off the monitor and pc. Unplugged all the cables from the monitor and pc, wait for 10 second till all the surged built up are cleared out. Then you can plugged all the cables back Monitor should have 3 cables, a audio cable, a VGA or DVI cables, and a power cord... OK! now you got all the cables plugged back in...
    Turned on the monitor and PC....and a few should hear window started. Still... had a problems....just get a external speakers. Have nice day!

    Oct 08, 2008 | Hansol H550 15" LCD Monitor

    1 Answer


    Is your monitor SUPPOSED to have sound? Apart from the power cable and the monitor cable, if it is a monitor with speakers, there should also be an audio cable. So 3 total. If it has a mic too, 4 cables. The audio cable is normally green and the mic cable pink.

    Most monitors don't have sound though, and the ones that do, sound crappy. So unless you just plan to hear Windows dings, get some cheap speakers.

    Sep 20, 2008 | Acer AL1916W 19" LCD Monitor

    2 Answers

    DC doesn´t has image

    try a different av cable or jiggle the connectro on the dreamcast av port

    Apr 10, 2008 | Sega Dreamcast Console

    1 Answer

    Television won't power up

    It sounds like the high voltage circuit got damp and arced. This arc caused the horizontal output transistor to short.
    You might try replacing the output transistor if you're experienced in this type of repair. If not then you need to take it to a repair shop.
    The "whistle " you're hearing is the power supply indicating that it has a short on its load. When the power supply has an over load (short) its frequency drops down when your ear can hear it oscillating. This type of power supply is a switching power supply normally operating a several thousand hz(cycles) which is out of range of human hearing.


    Mar 15, 2008 | Televison & Video

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