Radio-frequency filter

The RF22 radio-frequency (RF) filter works with balanced microphone cables. Used on a microphone channel that is picking up outside RFs, the filter eliminates the intruding interference while preserving the audio quality. The device rejects frequencies above 75 kilohertz and is compatible with mic output Z (150 to 1 kilohms), mixer input Z (1 to 3 kilohms), and phantom-powered microphones. The units are priced at $52.50 apiece.

The RF22 radio-frequency (RF) filter works with balanced microphone cables. Used on a microphone channel that is picking up outside RFs, the filter eliminates the intruding interference while preserving the audio quality. The device rejects frequencies above 75 kilohertz and is compatible with mic output Z (150 to 1 kilohms), mixer input Z (1 to 3 kilohms), and phantom-powered microphones. The units are priced at $52.50 apiece.

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