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Sub woofer has a hum

I have a Pioneer sub woofer in my home surround sound system. It has a hum when it is plugged in that really annoys me, so I unplug it when not in use. Is there a way to stop this humming sound?

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  • Anonymous Mar 14, 2014

    Every now and then...when I power up my system, the sub-woofer will not come on (no sound and no lit light on the front), the only way I can remedy this if to physically unplug the subs power cord and leave unplugged for about 15 minutes,then plug it back in, it will work fine after that...until the next time it happens. There is no rhyme or reason, it just keeps happening at different times. Very annoying, call the company to no avail, help !!!!

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I have found that with other appliances running, or a busy circuit, I have the same problem. Try to turn everything else in the house off and check again....A/C are often culprits. You can buy a line isolator for the plug, although they are just more money to spend. If this doesn't work, well, it could be a crappy home theaater receiver. It happens

Posted on Aug 08, 2008

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Posted on Jan 02, 2017

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1 Answer

I wish to replace a subwoofer on a surround sound system


In most surround sound systems the sub woofer is powered separately and uses a standard RCA coax connection to the receiver/amplifier.

Replacing is simply plugging in the new and reconnecting the coax cable.

Usually the audio signal is Dolby Digital 5.1 the (.1) is the LFE Sub-woofer. The connection is between the Subwoofer RCA connector on the amplifier and connects to the (LFE-Line) in on the subwoofer speaker.

Hope this helps?

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Aug 09, 2016 | Audio Players & Recorders

1 Answer

Pioneer cx4000 home stereo no rear speakers/subwoofers very low sound. only surround sound works normally


Either the sub woofer speaker or the sub woofer amplifier section circuit has the fault. Contact any service technician to make diagnosis the faulty section. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Circuit diagrams of many popular brand devices are given. Search the site by type in the "brand name" of your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Jul 04, 2016 | Pioneer Audio Players & Recorders

1 Answer

Wire diagram pioneer http-100 sub woofer


If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

May 27, 2016 | Pioneer Center Channel Speaker Htp100-cr...

1 Answer

I just got my system today. All the speakers are working, except the sub-woofer. Any ideas what could be wrong (if not DoA)?


Did you connect power to the sub-woofer? Most subs have their own amplifier. Just check if there is also an on / off switch on the sub.

Apr 18, 2015 | Frisby 5.1 Surround Sound Home Theater...

1 Answer

Psw111 hook up to vsx-522 subwoofer


Just use one of those jacks. Then turn the frequency select dial all the way up. This will work just as well.

Apr 21, 2013 | Yamaha 5.1-Ch. Surround Sound Home Theater...

2 Answers

I have a Fisher RS-909 Surrond Sound amplifier. It has no "sub out" jack. I had the sub-woofer working in the past by wiring it as shown in the manual. The problem is that the system was in...


Alright i had a chance to look over things, this is how you are going to hook up the sub. first we'll be connecting the surround sound unit to the sub woofer.
surround sound unit sub woofer
left front: positive (+) <-----to------------->(+) left speaker level in
negative ( - )<- - -to- - - - - - ->( - ) left speaker level in

right front: positive (+) <-----to------------->(+) right speaker level in
negative ( - )<- - -to- - - - - - >( - ) right speaker level in

now that the surround sound unit is connected to the sub woofer you will need to connect the front surround sound speakers to the sub woofer.
sub woofer front surround sound speaker
left speaker level out (+)<-----to--------> (+) left front speaker
left speaker level out( - ) <- - - to- - - - ->( - ) left front speaker

right speaker level out (+)<-----to--------> (+) right front speaker
right speaker level out( - ) <- - - to- - - ->( - ) right front speaker

Alright now that the wires are all over the place and plugged in
turn everything on and see how it sounds. let me know if everything is working as it should. if you need help with anything else or if something does not seem right please feel free to contact me via e-mail or phone
Mark Woodring

Feb 13, 2011 | Audio Players & Recorders

1 Answer

JVC TH-M45


no, u cant use the speakers with other normal DVD player because it wont have amplification for the speakers... u can use the sub to other dvd player because its inbuilt 120 watt woofer. ur dvd player is 5-disc player as wel as 120 X 2 and 80 X 3 watts amplifier (AV receiver ).... so just the JVC better sound thru the sub and speakers... ENJOY

kanny_amancha@yahoo.com
www.kanny-sounds.blogspot.com

Jan 24, 2009 | Pioneer 1000 Watt 5.1 Surround Sound...

1 Answer

I HAVE JVC SURROUND SOUND SYSTEM MODEL SP-PWM 45,I HAVE LOST 8 PIN CONNETOR FROM MAIN AMP TO SUBWOOFER. WHERE CAN I PURCHASE THIS CONNECTOR THANKS


Here is a link to the system cable that I think that you are reffering to. The model number of the system you have is TH-M45

The model number you gave is for the sub-woofer only. This is the system cable that is required to connected between the sub-woofer and the main head unit with the DVD changer in it.

http://www.jvcservice.com/store/ProductDetail.asp?Part=QAM0381-001%20%20%20%20

If you can not click on the above link, just copy the entire link and paste it into the address bar of your interent browser.

Since this is the part you want and it is the cheapest place to purchase it, a rating of "FixYa!" would be appropriate and very much appreciated. After all, it is the only reward we get for offering people like yourself this free technical support.

Thanks,
Dave

Sep 12, 2008 | Pioneer 1000 Watt 5.1 Surround Sound...

2 Answers

Subwoofer probelm


I suspect you have a bad cable, a poor ground or a bad
power supply inside the speaker amplifier. The amplifier
(inside the sub-woofer) could also be defective.
===
1) Bad cable or connector:
If the (braided shield/outer tube) of the coaxial input cable is
not grounded, the cable will pickup line frequency "hum"
from surrounding power lines, house wires, lights and
appliances.

This hum is then amplified by the speaker's amplifier
causing the constant bass sound you speak of.

Because the hum frequency fundamental is 60 Hertz in
North America, 50 Hertz in Europe, you hear it coming
mostly out of the sub-woofer, because the midrange and
high speaker circuits filter it out.

Check the input connectors, cable at both ends, wiggle
the jacks at a low volume setting to see if it changes.

Make sure that you are indeed using a properly shielded
coaxial cable.

A coaxial cable consists of a thin inner conductor, surrounded
by a flexible tube made up of a braided metal shield, which
must be grounded. This prevents hum from being picked up
by the sensitive amplifier inputs.
===

2) If the power supply within the sub-woofer's internal amplifier
is defective, the the power supply hum will also get coupled
into the amplifier and speaker with same results as above.

Power supply hum is typically twice the line frequency,
i.e. 120 Hertz, but not always, depending on what
component failed: Rectifier diode, filter capacitor, or
the voltage regulator.

3) Ground loops:
When you run very long cables between the source and
destination of an audio signal, multiple ground paths (must)
exist between the two points in space, creating complete
loop circuits.

Power line hum from the environment can (will) induce
heavy AC currents around these loops, creating a voltage
gradient across these cables, and in-between the end
devices.

Once again, this AC hum is coupled into the amplifier inputs.

Ground loops become a problem with cables over 10
feet long, and an astronomical problem for stage audio
engineers. To avoid ground loops, they must break
the circuit's continuity by using isolation transformers,
optical isolators, and/or differential input amplifiers.

So how long are your cables?

Most house stereo components are only designed to
handle 6 to 10 feet of cabling max.

30 feet is already asking for major trouble.

4) Feed back oscillation: This occurs when the output of
an amplifier is fed back to the inputs with a round trip
gain greater or equal to unity. The tiniest little electrical
disturbance is then amplified and re-amplified, over and
over again, usually at one preferred frequency, causing
the typical (ear-splitting) microphone squeal or howl.

In your situation feedback and/ loss of original signal
could be the result of mis-wiring the input cables.

Note that this is NOT as silly nor as unlikely as it sounds,
because many computer audio cards and even some
home stereo systems have re-configurable inputs and
outputs.

SOFTWARE configuration decides which jack at the
back does what !!!!

On my computer, for example, the Realtek audio driver
tries to automatically figure out what cable is connected
to each jack (usually it gets it wrong)

Using the Realtek control panel applet, I can then
manually re-configure the gray jack as input,
the green jack as bass, pink jack as center.... etc.

If this situation also applies to your system, please check
the software configuration. Connecting an output cable to
an input jack will certainly cause a lot of HUM and not
much music.

5) Finally, don't rule out internal sub-woofer failure. Unlike
the passive stereo/hi-fi speakers of days gone by, modern
multi-channel theater systems with front, center, rear and
sub-woofer speakers are internally amplified, with active
frequency cross-over filters and special effect/ surround
sound capabilities.

Usually, the large sub-woofer contains most of the
electronics, amplifiers and filters.

It feeds the other speakers, and it is controlled by
an external volume control module which can be separate
or built into one of the tweeters.

These sub-woofer electronics are prone to poor design,
overheating and early failure. (Even fresh out of the box
like yours)

If you cannot get it working, take it back to the store,
and make the NICE salesmen **** with it.

Good luck
Please rate my answers
Martin.

Jul 20, 2008 | Yamaha 5.1-Ch. Surround Sound Home Theater...

2 Answers

Connecting a sub-woofer to Pioneer VSX-453 surround reciever


I got the same issue. But, I go ahead hooked it up two banana plugs on teh VCR outlet. It works fine on my Cerwin Vega Sub.

Nov 08, 2007 | Pioneer VSX-453 Receiver

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