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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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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.

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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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My computer sound system


Most likely the sub has the crossover in it, most likely the 2 input cables from whatever device you want to play through the system will plug into the sub then the 2 speaker cables will come out of the sub and go to the speakers, just be sure to have everything connected into and out of the sub and make sure the power cords for the speakers and sub are plugged in, I am assuming this is a self powered system wich means the amplifiers are built into the speakers and sub.

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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...

1 Answer

Inifinity Entra Sub not working


The hum can be from the power supply not properly filtering, and or the output stage also has a short.

There is the chance that the speaker driver coil is now burned, or the power supply is now dead. If ther output stage is shorted and was putting DC on to the speaker cone, this will burn it very easily.

You should sent the unit out and have it serviced, unless you are properly trained, have the service and engineering manuals, and the test equipment to follow up on a proper repair and calibration.

Jerry G.

Apr 27, 2008 | Infinity PS-10 Subwoofer

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