Question about JVC SP-PW100 Subwoofer

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Speaker wire to coaxial cable

Hi,

I have a JVC subwoofer that uses speaker wire. However, we just moved in to a house pre-wired for surround sound that has coaxial cable for subwoofer. Is there an adapter we can purchase to connect the speaker wire to the wallplate and the coaxial cable?

Thanks

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Yes ! all you have to do is go to radio shack and tell them you want a coaxil to RCA adapter (screw coaxial into wallplate and plug RCA end into sub and your all set!)
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Posted on Dec 28, 2008

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Yes. I assume the coax connectors are the same type as the cable input on a TV set or cable box?
The following quoted descriptions have to be reversed if you are attaching directly to a wall receptacle instead of a cable; 'female F' becomes 'male F'. Check around for a 'female F to binding post' or 'female F to banana jack (or plug)' adaptor. If you can only find the latter type, you will need male or female banana jack or plug adaptors to connect the speaker wires. Most electronic supply stores or in the US, Radio Shack will have these.    

Posted on Dec 28, 2008

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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
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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
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30 feet is already asking for major trouble.

4) Feed back oscillation: This occurs when the output of
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In your situation feedback and/ loss of original signal
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Note that this is NOT as silly nor as unlikely as it sounds,
because many computer audio cards and even some
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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
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5) Finally, don't rule out internal sub-woofer failure. Unlike
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frequency cross-over filters and special effect/ surround
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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.

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