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speaker interference

By rjboschen ·
after adding cable modem, wireless router, usb wireless nic's, and a usb wireless print server, i now have a constant "tapping" noise in my 5.1 surround sound speakers. a radio tech told me it's from the coax cable, but i suspect the 802.11g gear. all the components are relatively close to each other, exc one nic in an adjacent room. your thoughts pls. tks.

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by TheChas In reply to speaker interference

Start by opening the mixer panel for your sound card.

Disable (mute) the line and microphone inputs.

If you still have the noise, make sure that the speakers power cord is plugged into a different outlet strip than the router and / or modem.

You might need to locate the router as far from the speakers as practical.

Another thing to try, is to connect the USB NIC with an extension cable or hub so that it is not located near the sound card and cable.

Still have the noise, it might be time to call in a pro.
If you have a high end audio retailer near you that performs installations, their service department has likely dealt with similar situations. They would have the tools and expertise to detect and correct the problem.

RF noise problems are difficult to fix remotely.
Extra shielding, ferrite beads, even custom cables may be required to correct the problem.

Chas

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by HAL 9000 Moderator In reply to speaker interference

What you are describing was a very common thing with sound systems and is called an Earth Loop where instead of the voltage returning to the neutral link it is finding its way over the connecting cables and earthing from one of the other devices.

The only solution is to earth everything possible which isn't easy with all this double insulated stuff but if you can find some metal parts on the outside of the cases just join them all together.

Failing that remove one piece of hardware at a time until the noise stops. Once this happens leave the last piece of hardware out of the installation and begin reinstalling the other bits of hardware and if the noise doesn't return you have found the suspect piece of hardware.

You can then return it for replacement as it has a problem which could very well be a design problem and every one is the same through a poor design. This should only affect external hardware and if you can separate all of the external hardware onto different circuits the problem should disappear as well.

Col

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