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Sean Castille
Sean Castille Posted on Oct 28, 2017
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My car sub woofer is humming (I'm pretty sure) when I unplug the rca it goes away but when plugged in has the humming and barely hits all connectiona are good so I'm really baffled its a 4 ch amp that can be bridged but I have my two subs not bridged on it does that make a difference? Can anyone tell me wby it's making the humming noises?

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danyllle olson

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  • Posted on Oct 28, 2017
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Crossed wires or bad ground

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Make sure your rca are not up against any heavy metal or pinched by something. cheap rca cables have no type of insulations coating and when up against metal will cause interference. mine did the same thing when I ran it up against the seat belt bracket... pull it out from where you have it routed from but leave it all hooked up and see if it still MAKING the same noise if it goes away then try reroute or get better rca and make sure no pinched wire hope this helps .... always go with good rca cables

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Anonymous

  • 624 Answers
  • Posted on Jun 17, 2008

SOURCE: HOW TO CONNECT SUB WOOFER IN 4CH CAR AMP

sounds like you need another amp, if the amp has a speaker already connected to each channel, you have no open channel to connect a sub-woofer.
Some years ago I seen an amplifier that was designed to use 3 speakers on 2 channels. what they did was had a speaker on each channel and then they bridged the 3rd speaker across it. That amplifier was designed for this configuration, unless you have an amplifier like that you should not try it. It may result in smoke from the amp.

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Anonymous

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  • Posted on May 07, 2009

SOURCE: make the sub pop and hum and no rca wire are hooked in?

first off nice choice on the amp check ur power and ground connections make sure the main battery to bady ground is good if questionable add a new one cant hurt to have extra grounds from the batt to the body make sure the amp ground is as short as u can make it make sure its grounded to bare metal if any of these dont work u may have a prob inside ur amp 

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Related Questions:

1helpful
1answer

My Velodyne DPS-10 subwoofer hums when you plug in the RCA cable. The hum increases in volume when you touch the rear metal panel.
hi,
You have to check the RCA cable to the sub woofer. The RCA cabe have two connections inside it, one is for gain and the other is for ground sheild. If the ground sheild is broken then there will be hum from the sub woofer and it will increase if you touch the ground (rear metal pannel is connected to the ground). Replace the cable and check it again.
ok
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Jul 17, 2011 • Velodyne DPS-10 Subwoofer
0helpful
3answers

Powered subwoofer has hum
First of all confirm if the hum is an internal or external problem.
Disconnect the RCA sub woofer input from the back of the unit and turn it on. If there is no hum it could be the interconnecting cable or the output from the receiver. But in the stand alone mode if the sub woofer hums when powered on you have internal problem and will have to be looked into by a professional.
Many a time the earth or the shield of the interconnecting cable is the culprit, because the sub sits on the floor and you might shift it for cleaning the floor and the cable can stretch and snap internally.
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Apr 01, 2011 • JBL SCS145.5 System
0helpful
1answer

No sound comingout now on my HT BD2T subwoofer,just humming.
Try reconnecting; then replacing the audio cable for the sub woofer. I think it is just a standard RCA cable.

When you disconnect the RCA cable does the sub woofer still hum? If so the sub woofer may be bad. If it falls silent chances are it's just the cable.
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Mar 08, 2011 • Samsung Audio Players & Recorders
0helpful
1answer

I have no output from subwoofer
Hello Fixya customer,

Thank you for your question.

Please check that the sub woofer and RCA cable are working by removing the RCA wire from the Sub woofer output of the Onkyou and touching the center terminal of the RCA plug. You should here a hum when it is touched.

If you get the hum, then the next step is to "Clear" the Onkyo by holding down the "VCR and Stby" button until you see "Clear" on the display. Warning, this will clear any settings special that you have made to the receiver, but will get you back to the Factory settings.

Lastly, check various sound fields, and the Sub woofer volume setting, if you still do not get sound, please have a Onlyo service center verify the output.

Thank you using Fixya.
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Apr 28, 2010 • Onkyo TX-SR606 Receiver
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HUM noise at PSW3000 if i connect the Yamaha RX-V995
the conections some where are dirty you need to unplug everything clean all connections and the hum will go away
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Nov 06, 2009 • KEF Audio PSW 3000 Subwoofer
0helpful
1answer

Bare wire sub to single RCA jack receiver
Yes you can modify RCA cables to make bare wire tails.
If the unit has a sub o/p then you just connect up your sub bass unit to whatever the amp needs.

An RCA cable is 2 wire which is all you would normally need for sub bass speaker level signal.
It may be a good idea to eventually upgrade the wire size if you want really good sub bass as lower frequencies draw more current and so require more copper.

Please let me know if this any help, thanks for using FixYa.



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Sep 20, 2009 • JVC RX-554V Receiver
0helpful
1answer

I have a kdc-mp435u and when i connect the subs woofers to it,it dissent put out enough out put Signal to it and when im driving some times it give signal the woofers cussing them to hit heartier. I check...
did you plug your rca signal wires into the subwoofer ouput rca's? if so you can control the level and frequency of the sub on the face in the audio menu. if this is not the issue try new rca cables. you can run them outside the car first just to test. another issue is make sure you have proper grounding on the head unit and amp. also if your rca cables acccidently touch power they can blow a fuse or trace inside the radio causing the rca's to lose ground (you will have low audio with lots of humming noise). you can check this by jumpering a small wire from the radio frame to the outer shield of the rca jack while it is all plugged in. if the sound gets louder and cleaner you can secure this wire in place by soldering it or fixing the circuit board itself.
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Dec 09, 2008 • Kenwood KDC-MP435U CD Player
0helpful
1answer

RCA Sub-Woofer
Did you try making sure the subwoofer is turned on under the set up menu on the Sony Receiver?

Press Set Up, Press the left or right button above the scroll wheel until you get to SW. It should say SW: ON or SW: OFF. If it says SW: OFF, use the Scroll wheel to scroll right until it says SW: ON. Also, make sure you aren't in 2CH mode, try A.F.D or surround sound.
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Jul 26, 2008 • Sony STR-DE445 Receiver
0helpful
2answers

Sub woofer cuts on and off.
I am an Electronics Tech and just finished repairing a LW12 for a customer. It also has the HUM. IF I place a finger on the RCA input and another finger on the heatsink..(black metal plate at the back) then the hum goes away. I did notice that Cerwin V maunfactured this older LW12 unit with a 2 prong cord. I personally own a newer CV 10" sub, 3-prong and has never had a problem with it and it has awesome Bass. So for my customer...I am thinking I will add a 3-prong cord. and see what happens.....
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May 20, 2008 • Cerwin Vega LW12 Subwoofer
0helpful
2answers

Sub Woofer Won't Work
Connect the input from the powered subwoofer to the rca jack on the VSX-409D labelled 'sub woofer preout'.
Read full answer
Dec 24, 2007 • Pioneer VSX-D409
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My Velodyne DPS-10 subwoofer hums when you plug in the RCA cable. The hum increases in volume when you touch the rear metal panel.

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