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Jensen Transformers PO-2RP

ISO-MAX Stereo Audio Line Output Isolator 1 to 1 Ratio (Formerly DM2-2RP)

Made in the USA
Jensen Transformers PO-2RP ISO-MAX Stereo Line Output Isolator 1 to 1 Ratio

Jensen Transformers PO-2RP ISO-MAX Stereo Audio Line Output Isolator 1 to 1 Ratio

The Jensen Transformers
PO-2RP Dual Line Output Isolator provides an elegant way to avoid ground loop problems while driving balanced or unbalanced inputs from either balanced or unbalanced outputs.  Gold-contact DIP switches provide maximum grounding configuration flexibility, solving equipment problems.

Built with 80 percent nickel transformers, the PO-2RP offers excellent performance when used with the relatively high output impedances that are common in consumer electronic gear. This ISO-MAX has no input or output cable length restrictions.

The configuration shown here is RCA to 1/4-inch TRS Phone, but can also be configured with any combination of  XLR, RCA, 1/4-inch Phone Jack or BNC connectors.  You may also choose the "None" option if you prefer to use the barrier strip alone.

Here are the audiophile-quality specifications:

  • Distortion 0.004% typ. at 20 Hz and +4 dBu output level
  • Wide bandwidth: -3 dB at 0.10 Hz and 15 MHz
  • Handles levels up to +22 dBu at 20 Hz and +26 dBu at 30 Hz
  • Excellent time domain performance: DLP 0.3E typ. 20 Hz to 20 kHz
  • Integral ground option switches solve other equipment problems

If you're not sure which model to choose, please check out our Jensen Transformers Application Guide.

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 PO-2RP 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.

Ground Loops?

(or why the best planned systems sometimes sound bad)

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 audio system.

When devices in the same system are powered by separate power sources, that can cause a difference in ground potential between the two pieces of equipment. 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, but the result of this difference in ground potential is commonly referred to as a ground loop.

Mixing balanced equipment with unbalanced equipment by using passive adapters or cables often exasperates ground loop problems.

The Solution

The Jensen Transformers PO-2RP is elegant in its simplicity. Simply insert the PO-2RP anywhere in the signal path and immediately, the effects of the ground loop become a non-issue. Problem solved. There are not too many things that one can install in an audio system that can provide so much improvement with so little effort.

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 PO-2RP into your signal path, and you may want to consider upgrading your existing cable(s) as well. The PO-2RP does not include any cables, but if you need them, we have some excellent audio interconnect cables available. Please click here to see them!

Jensen Transformers' Description

Jensen Transformers PO-2RP

Stereo Line Output Isolator, 1 to 1 Output Ratio

The Model PO-2RP provides over 100dB of common mode isolation at 60Hz. Transformer isolation allows any type of output driver to be connected to either balanced or unbalanced inputs without causing loading or instability problems.


  • Ruler flat frequency response preserves "Audiophile Quality" signals
  • High-Grade Nickel-Iron-Molybdenum alloy cores for extremely low distortion
  • High quality gold plated connectors for long term reliability
  • Available with a choice of XLR, RCA, 1/4" Phone Jack or BNC connectors
    [Configurations other than XLR/XLR, RCA/XLR and RCA/Phone are special order]
  • Unpluggable screw terminal strip for easy "Home" to "Road" changeovers
  • Convenient 7.0" W x 3.5" D x 1.6" H. dimensions allow rack tray or rail mounting
  • Gold Contact DIP Switches allow for flexibility in grounding configuration


Jensen Transformers PO-2RP, open

Here is a peek inside the device.

Jensen Transformers PO-2RP application example - PA

In this application example, a PO-2RP is connected at the output of a mixer, instantly eliminating hum and buzz caused by ground loops.

Jensen Transformers PO-2RP application example - Consoles

Here the PO-2RP is inserted into the signal chain between two consoles, breaking the ground loop and eliminating noise while easily handling huge bass transients without distortion.

Jensen Transformers PO-2RP User Manual - click to download PDF

Here is the datasheet in PDF format.

In-Stock Configurations and Pricing
Product Description SKU MSRP Your Price Quantity
ISO-MAX Stereo Line Output Isolator, 1 to 1 Ratio
RCA inputs / 1/4-inch TRS Phone outputs (as shown on this page)
PO-2RP $439.99 $399.99
ISO-MAX Stereo Line Output Isolator, 1 to 1 Ratio
RCA inputs / XLR outputs
PO-2RX $439.99 $399.99
ISO-MAX Stereo Line Output Isolator, 1 to 1 Ratio
XLR inputs / RCA outputs
PO-2XR $439.99 $399.99
ISO-MAX Stereo Line Output Isolator, 1 to 1 Ratio
XLR inputs / XLR outputs
PO-2XX $439.99 $399.99
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Special-Order Configurations and Pricing
Product Description Base SKU MSRP Your Price
ISO-MAX Stereo Line Output Isolator 1 to 1 Ratio PO- $379.99 $319.99
Option Description Select Options
Select Input Connectors
Select Output Connectors
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