Impedance Transformers (<1:1, >1:1)

Audiophile System RFI Kit for Tuner/Preamp/Receiver, Turntable, CD Player, Speakers - 12 filters

SKU RFI-AF
$69.95
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Audiophile System RFI Kit for Tuner/Preamp/Receiver, Turntable, CD Player, Speakers - 12 filters
Product Details
MPN: RFI-HTS-SW
Type: NEW
Country/Region of Manufacture: USA
Filter Power Rating (PEP watts): not applicable
RFI Suppression Range (MHz): 1-300 MHz

The audiophile RFi kit is specifically designed to suppress audio interference triggered by Radio Frequency Interference problems experienced in typical audiophile systems using a tuner/preamp/receiver, turn table, CD player and speaker system. The ferrite filters are selected to eliminate RFI from 1 to 300 MHz. The filters are easy to install, don’t require modification of the protected equipment and work in almost all cases.

What is included in the kit?

The Audiophile RFI kit contains a a 4 ring filters for the AC power cord and 8 snap-on filters (4-1/2" ID, and 4-3/8' ID) for the device interconnect wires as well as the speaker wires.


Palomar Engineers offers a variety of impedance transformers configured as Baluns (balanced coax to unbalanced load) or Ununs (unbalanced coax to unbalanced load) for  matching typical 50 ohm feed line impedances to antenna or other load impedances.

We specify impedance ratios as an output to input ratio where the output (or load) is given first and the input is given second (e.g. 100:50 (2:1) would mean a 100 ohm output and a 50 ohm input; a 25:50 (1:2) would mean a 25 ohm load and a 50 ohm input).  Most all products use a 50 ohm input unless otherwise specified.

We have products that are available as kits for the do-it-yourself (DIY) person or fully assembled and tested units for the “Plug & Play” crowd.

Our impedance transformers are available using two different topologies: Binocular cores or  toroid cores with multiple turns for increased effectiveness and wide band frequency transformations.  We utilize single and multiple core transformers using high order windings when needed to extend product performance.

We rate the power ratings as watts PEP (Peak Envelop Power) with standard duty cycles for various modes. To determine the PEP rating required for your needs, see: Choke & Transformer Power Ratings

This website page serves as a link page to the frequency ranges of our impedance transformers configured as either baluns or ununs.  You can click on a picture to go to the specific page about the products described in the picture.