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Jensen Transformers CI-RJ2R-SET
Stereo CAT-5 Audio Baluns

ISO-MAX® with Built-In Ground Isolator - Hum and Buzz Eliminator

Made in the USA
Jensen Transformers CI-RJ2R-T ISO-MAX Stereo Audio Cat-5 Transmitter Balun

Jensen Transformers CI-RJ2R-T ISO-MAX Stereo Audio Cat-5 Transmitter Balun (one included with each set)

Jensen Transformers CI‑RJ2R‑SET Stereo CAT-5 Audio Baluns provide an elegant way to extend analog stereo audio signals up to 350 feet using twisted-pair cabling such as Cat-5 or Cat-6.

The CI-RJ2R balun set uses the same transformer as the award-winning Jensen Transformers model CI-2RR, so you also get class-leading ground loop isolation, in addition to an audiophile-grade balun/extender.

Check out the graphs at the right to see direct performance comparisons to other popular stereo audio baluns - the differences are both dramatic and revealing!  And of course it is the only such balun that bears the prestigious Jensen Transformers ISO-MAX® designation.

The CI-RJ2R-T (transmitter) and  CI-RJ2R-R (receiver) are housed in sturdy metal enclosures, each measuring 4.32" W x 2.6" D x 1.45" H., including the flanges. The flanges have mounting holes, which are handy for permanent installations.

Please do not confuse the CI-RJ2R-SET with similar (but inferior) products. Jensen Transformers' ISO-MAX Audiophile-Quality Baluns/Isolators provide the ultimate signal interface solutions.  They solve the fundamental problems associated with ground loops, without degrading signal quality.

With inferior products coming from all over the world, we think it is a genuine treasure to find a company like Jensen Transformers, actually designing and manufacturing some of the finest products in the world, right here in the USA, and we are proud to be able to offer their products.  The CI-RJ2R-SET is made in the USA, is backed by the manufacturer's comprehensive one-year warranty, and has a remarkable 20-year warranty on the transformer device itself.

Please check out our Jensen Transformers Application Guide for information on the other members of the ISO-MAX family.

Ground Loops?

(or why the best planned systems sometimes sound bad)

This part pertains to the isolator functionality that is built-in to the CI-RJ2R stereo audio balun set.

It is a subject that is seldom discussed in manufacturers publications, or even in magazines of the trade, but ground loops can happen even in the most carefully planned A/V system.  When ground loops happen, the result is unwanted hum and buzz.

Ground loops are often the result of the fact that in a complex A/V system, some components may be powered by a different electrical branch circuit than the rest of the A/V system. The result is that the neutral or groundside of the two circuits can be at a slightly different potential.  It can be because one of the circuits is loaded more heavily than the other, or because one run is longer than the other, or any number of other reasons that are beyond the scope of this article.

Ideally, ground loops would be prevented at the design level, but if you are working with an existing room, it is not always possible or practical.

Ground loops can occur in mobile installations as well, because all of the amplifiers in the system have their own internal power supplies, and voltage drop percentages in a 12-volt system can be even more challenging than in a home system.

Don't Forget the Cables!

Good cables are very important in the fight against hum and noise. You will need at least one short patch cable in order to insert the CI-RJ2R-SET into your signal path, and you may want to consider upgrading your existing cable(s) as well.  To avoid excessive high frequency losses, no more than 3 feet of cable should be used on its output.  The CI-RJ2R does not include any cables, but if you need them, we have some excellent audio interconnect cables available.  Please click here to see them!  We also have some outstanding twisted-pair cables, if you want the very best we have found, they are here.

Jensen Transformers' Description


Stereo CAT-5 Audio Baluns



  • True audiophile signal quality for the finest home theater systems
  • Flat response from 5 Hz to 20 kHz and low phase distortion for improved transients and imaging
  • Handles high signal levels, even at sub-woofer frequencies, with ultra-low THD
  • High noise rejection eliminates hum and buzz
  • Uses up to 350 feet of CAT-5 cable and supports shielded cables
  • Entirely passive - requires no power supply
Jensen Transformers CI-RJ2R-R-RHere is the included CI-RJ2R-R receiver balun

Here is the included CI-RJ2R-R receiver balun.

Jensen Transformers CI-RJ2R-R  ISO-MAX Stereo Cat-5 Audio Baluns, performance graphs

The audiophile-grade performance differences can be easily see in these graphs, comparing the CI-RJ2R baluns to their nearest competitors!  PDF format.

Purchase Information
Product Description SKU MSRP Your Price Quantity
ISO-MAX Stereo Cat-5 Audio Balun Set CI-RJ2R-SET $240.00 $209.99
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