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JK Audio Pureformer - Stereo Isolation Transformer

B&H # JKPUR Mfr # PUR
In Stock
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You Pay: $65.55

The Pureformer from JK Audio is a stereo audio interface that employs transformers to provide hum and noise reduction for any two pieces of line level audio equipment. The unit removes ground loops and DC paths that can cause severe signal degradation.

The Pureformer functions by isolating the electrical grounds of both pieces of equipment, allowing only the audio signal to pass between them. This is especially crucial when one of the pieces of equipment is a computer sound card, where the electrical noise from the computer can get into the rest of the audio system.

The unit is also useful in the event that two pieces of equipment are DC coupled. If both input and output are DC coupled, the signal can easily distort, break-up, or simply disappear. The Pureformer safely isolates any combination of AC and DC coupled inputs and outputs.

Compact interface for removing hum and noise between any two pieces of audio equipment
Especially useful when hooking up on-board computer sound cards with other audio equipment
Pureformer can also help when input/output incompatibilities exist
Utilizes high-quality, low-distortion, 600Ω audio transformers
Durable die-cast aluminum construction
Frequency Response 20Hz to 20kHz, +/-0.1dB
Inputs 2 x RCA
Outputs 2 x RCA
Input Impedance 600Ω
Output Impedance 600Ω
Insertion Loss 0.8dB
Isolation 1500VRMS
Dimensions (WxDxH) 3.6 x 1.3 x 1.8" (91 x 33 x 46mm)
Weight 5 oz (142 g)
JK Audio Pureformer - Stereo Isolation Transformer
  • Two (2) Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    JK AudioPureformer Isolation Transformer
     
    4.8

    (based on 11 reviews)

    Ratings Distribution

    • 5 Stars

       

      (9)

    • 4 Stars

       

      (2)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Easy to use (11)
    • Compact (10)
    • Good audio (9)
    • Lightweight (6)
    • Versatile (5)

    Cons

      Best Uses

      • Amateur recording (5)
      • Home studio (5)
      • Outdoor events / games (4)
      • Performances (3)
        • Reviewer Profile:
        • Experienced (10)

      Reviewed by 11 customers

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      Displaying reviews 1-11

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      (4 of 4 customers found this review helpful)

       
      4.0

      Sturdy box, wimpy transformers

      By Tony the Tinkerman

      from Somerset County, NJ

      About Me Experienced

      Pros

      • Compact
      • Durable
      • Easy To Use

      Cons

      • Limited bass capability

      Best Uses

      • Home Studio

      Comments about JK Audio Pureformer Isolation Transformer:

      I got this device to reduce the annoying computer whine I experienced when I connected my desktop computer to my earth-grounded stereo setup. I had the two connected with simple unbalanced cables, but since the signal ground in the computer's sound card was the same as the main power ground, there is a lot of high frequency hash from all the digital switching going on, and it rides on the connection as a common mode signal. This noise has a very low source impedance, so it cannot be helped by further grounding. Isolation transformers seemed the only solution.

      The Pureformer did the job all right--the hash was at least 10 or 15 dB lower--but I started hearing really nasty distortion on music with even moderate levels of bass. Using a signal generator and an oscilloscope, I was able to see the problem: core saturation at low frequencies. At 20 Hz, the transformers could only handle a signal of about 140 mV before distorting. Naturally, at higher frequencies the threshold was higher, reaching 570 mV at 40 Hz and a decent 2.1 V at 100 Hz. The problem is that signals with this kind of bass are very easily encountered with normal music from consumer electronics.

      Opening up the metal box revealed two dinky little transformers. Truly adequate performance would require quite a bit more metal in the transformer cores. No wonder the manufacturer doesn't provide much in the way of specs!

      I tamed the problem by reducing levels 10 dB, but that's not an ideal solution. At some point I'm going to have to get a couple of better transformers.

      I am checking "recommended" with the caveat that you keep signal levels very low.

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      5.0

      Pureformer Works

      By J

      from Bowling Green, KY

      About Me Experienced

      Verified Buyer

      Pros

      • Clear Sound
      • Compact
      • Easy To Use

      Cons

        Best Uses

        • Amateur Recording

        Comments about JK Audio Pureformer Isolation Transformer:

        I am using this box between a mixer's tape out and a laptop's line in. Previously, the noise level was out of hand, and now it is tamed. We're still getting some noise, but I'm fairly sure it's from other components.

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        5.0

        Top shelf performance, budget price!!

        By Hi-Fi Lover

        from Florida

        About Me Experienced

        Verified Buyer

        Pros

        • Clear Sound
        • Compact
        • Durable
        • Easy To Use
        • Lightweight
        • Versatile

        Cons

          Best Uses

            Comments about JK Audio Pureformer Isolation Transformer:

            I have a high-end audio system that somehow developed a ground loop. I initially tried a cheaper device from another retailer and manufacturer that also eliminated the ground loop, but I noticed a marked reduction in sound quality. With over $10k invested in my components, this was not acceptable. I researched this item and noticed its negligible insertion loss and performance over the audio spectrum. I will eventually try to solve the ground loop issue at its root, but with the Pureformer's outstanding performance I don't need to rush! If you spend more for another device it's simply because you want to, not because you have to!

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            (1 of 1 customers found this review helpful)

             
            5.0

            JK Audio Stereo Isolation Pureformer

            By Tronman

            from Phoenix, AZ

            About Me Experienced

            Verified Buyer

            Pros

            • Clear Sound
            • Compact
            • Easy To Use
            • Lightweight
            • Versatile

            Cons

              Best Uses

              • Amateur Recording
              • Events
              • Home Studio
              • Mobile DJ
              • Performances
              • Professional Recording

              Comments about JK Audio Pureformer Isolation Transformer:

              Works Beautiful!!! Had a Hafler P7000 350w/Ch Amp with ground loop noise issues. Tried Radio Shack equivalent which worked but had low end roll-off and was using Amp as a Sub Amp so that was no good. Put this in line ground loop GONE and Silence had returned with no degradation in Audio Freq 20hz-20Khz Nice!!! Well worth it if you need the BEST and the complete audio spectrum for your equipment.

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              (1 of 1 customers found this review helpful)

               
              5.0

              Removes hum

              By ChrisP

              from Pittsburgh, PA

              About Me Experienced

              Verified Buyer

              Pros

              • Clear Sound
              • Compact
              • Easy To Use

              Cons

                Best Uses

                  Comments about JK Audio Pureformer Isolation Transformer:

                  I use this ground loop isolator to remove the hum when connecting a laptop's headphone output to my stereo amplifier.
                  Build quality seems good, and I have noticed no loss of signal intensity and no distortion.
                  I used a $10 isolation transformer before, but that had poor-quality connectors plus distortion.

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                  5.0

                  It did what I needed it to do

                  By Durnick

                  from San Diego, CA

                  About Me Experienced

                  Verified Buyer

                  Pros

                  • Clear Sound
                  • Compact
                  • Easy To Use
                  • Lightweight

                  Cons

                    Best Uses

                      Comments about JK Audio Pureformer Isolation Transformer:

                      I had a bad hum when I connected my computer soundcard to my home stereo. This took it right out. Nice solid construction too.

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                      (1 of 1 customers found this review helpful)

                       
                      5.0

                      So easy!

                      By Televisionguy

                      from Boynton Beach, FL

                      About Me Experienced

                      Verified Buyer

                      Pros

                      • Clear Sound
                      • Compact
                      • Easy To Use
                      • Lightweight
                      • Versatile

                      Cons

                        Best Uses

                        • Amateur Recording
                        • Events
                        • Home Studio
                        • Mobile DJ
                        • Performances

                        Comments about JK Audio Pureformer Isolation Transformer:

                        It's so easy to install...take it out of the package and connect it. Does the job!

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                        (1 of 1 customers found this review helpful)

                         
                        5.0

                        Works great!

                        By homeStudio

                        from San Jose, CA

                        About Me Experienced

                        Verified Buyer

                        Pros

                        • Clear Sound
                        • Easy To Use

                        Cons

                          Best Uses

                          • Amateur Recording
                          • Home Studio

                          Comments about JK Audio Pureformer Isolation Transformer:

                          Solves the digital noise issues between my computer's sound card and my audio interface without degrading frequency response.

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                          (1 of 1 customers found this review helpful)

                           
                          5.0

                          Soundcard Trash Eliminated!

                          By THE PERFESOR

                          from Rochester ny

                          About Me Experienced

                          Verified Buyer

                          Pros

                          • Clear Sound
                          • Compact
                          • Easy To Use
                          • Lightweight
                          • Versatile

                          Cons

                          • Need 35mm jacks too

                          Best Uses

                          • Events

                          Comments about JK Audio Pureformer Isolation Transformer:

                          For those of you that use your laptop for demonstrations, in my case, specifically audio, you never know what you will get as far as noise added.
                          Even apple laptops generate trash via audio out when hooked up to external systems. Being an audio engineer I needed a reliable transformer to isolate these issues and the JK Pureformer was inexpensive and does the trick. Adding 3.5mm jacks in parallel would be even better but for the price and a couple of decent cables it does the job. Problem is, everyone one wants to borrow this. I tell them to get there own. I can now turn things up and not hear that annoying laptop trash buzzing in the house.

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                          (1 of 1 customers found this review helpful)

                           
                          5.0

                          Fantastic noise filter

                          By The Outlaw Jammin' Jay

                          from Waitsfield, VT

                          About Me Novice

                          Verified Buyer

                          Pros

                          • Clear Sound
                          • Compact
                          • Easy To Use

                          Cons

                            Best Uses

                            • Amateur Recording
                            • Events
                            • Home Studio
                            • Performances

                            Comments about JK Audio Pureformer Isolation Transformer:

                            I'm using this product between my laptop and a sound board to filter out the audio noise coming from my laptop's line out port. It is a simple install and does what it says it will.

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                            4.0

                            Thank you Pureformer!

                            By Rick

                            from Peoria Illinois

                            About Me Experienced

                            Verified Buyer

                            Pros

                            • Compact
                            • Easy To Use
                            • Lightweight
                            • Versatile

                            Cons

                              Best Uses

                              • Classroom Audio

                              Comments about JK Audio Pureformer Isolation Transformer:

                              Our Church here in Peoria Illinois, Northwoods Communty Church offers multiple spiritual training opportunities in multiple classrooms throughout our 140,000 SF Campus. One classroom has two (2) 55" Wall mount Plasmas driven by a PC running PowerPoint,DVD's and other multi Media. When the rooms are quiet, a noticible hum is generated by the audio card in the PC and expanded upon by the audio inputs of the Plasma screens. The JK Audio Pureformer Isolation Transformer removed the hum and restored the serenity to the room. Thank you B&H and thank you JK Audio!

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                              Pearstone -  2 RCA Male to 2 RCA Male Audio Cable (3')
                              • You Pay: $4.95
                               

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                              • You Pay: $6.99
                               

                              Engineer's Essentials

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                              • You Pay: $14.49
                               
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