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Two inexpensive tests...

Posted by Al Sekela (A) on November 2, 2009 at 14:27:57

In Reply to: RE: Good for you! posted by Hoshi on November 1, 2009 at 12:37:28:

If you want to see if reducing RF noise from/to your Linaeum tweeters improves the quality of your treble, there are two ways.

One approach is to apply a parallel R-C filter across the terminals of each tweeter. Inmate Awe-d-o-file sells these under the EconoTweaks name from the Asylum classifieds. These are cheaper than the Walker High Definition Links upon which they are modeled. The filters come with spade connectors attached and will fit over other spades on binding post or screw terminals. It is not clear from your photos what kind of terminals the Linaeum tweeters have.

The second is to place a JW Miller RF choke in series with the tweeter. These are the type 5502 or 5522, and are available from Mouser Electronics. You would have to fit your own connectors.

These tweaks would also work on the speakers as a whole if they are acting as RF antennas.

Clamp-on ferrite rings would affect the RF, but may also affect the audio band directly. This would make it difficult to conclude whether RF noise were present.

My advice for those new to the topic of RF noise reduction is to survey your house for possible sources of RF noise, using your audio system as a tester. Listen to something with closely-mic'd vocals and lots of sibilants or cymbals. Turn off and unplug non-audio appliances that may be generating RF noise, one at a time, and listen again. Improved realism indicates the candidate appliance is generating RF noise and that your audio system is sensitive to it.

Candidate appliances are anything with a switching power supply that runs a microcomputer controller. These days, almost all appliances have such things because they allow complicated control functions. Personal computers, digital and video gear, garage door openers, and high-efficiency furnaces may generate more noise because they contain digital processing or radio receiver circuits.

Counter-measures are to improve the RF rejection and damping of your audio cables, provide noise filters for the AC supply, and isolate the noisy appliances with surge-protector strips that also contain EMI/RFI filters (these will have text on them indicating the decibels of noise reduction).

• EconoTweaks Detail Magnifiers on Asylum classifieds   (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable

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