JK Audio Pureformer Isolation Transformer

JK Audio Pureformer Isolation Transformer

JK Audio Pureformer Isolation Transformer

B&H # JKPUR MFR # PUR
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Product Highlights

  • For Use with Line-Level Audio Equipment
  • Works with Computer Sound Cards
  • Reduces Hum & Noise
  • Removes Ground Loops & DC Paths
  • Isolates & Mitigates Electrical Grounds
  • Isolates AC & DC Coupling
  • Uses 600-Ohm Audio Transformers
  • No Power Required
  • Die-Cast Aluminum Contruction
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JK Audio Pureformer overview

  • 1Description

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, 600-Ohm audio transformers
Durable die-cast aluminum construction
UPC: 814170010192
In the Box
JK Audio Pureformer - Stereo Isolation Transformer
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    JK Audio Pureformer specs

    Frequency Response 20 Hz to 20 kHz, ±0.1 dB
    Inputs 2 x RCA
    Outputs 2 x RCA
    Input Impedance 600 Ohms
    Output Impedance 600 Ohms
    Insertion Loss 0.8 dB
    Isolation 1500 VRMS
    Dimensions (WxDxH) 3.6 x 1.3 x 1.8" (91 x 33 x 46 mm)
    Weight 5 oz (142 g)
    Packaging Info
    Package Weight 0.55 lb
    Box Dimensions (LxWxH) 5.7 x 3.4 x 2.4"

    JK Audio Pureformer reviews

    Pureformer Isolation Transformer is rated 4.8 out of 5 by 12.
    Rated 5 out of 5 by from Soundcard Trash Eliminated! 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.
    Date published: 2010-05-06
    Rated 5 out of 5 by from Top shelf performance, budget price!! 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!
    Date published: 2011-05-22
    Rated 4 out of 5 by from Sturdy box, wimpy transformers 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.
    Date published: 2012-06-06
    Rated 4 out of 5 by from Thank you Pureformer! 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!
    Date published: 2010-03-02
    Rated 5 out of 5 by from JK Audio Stereo Isolation Pureformer 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.
    Date published: 2011-01-21
    Rated 5 out of 5 by from Removes hum 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.
    Date published: 2010-12-20
    Rated 5 out of 5 by from Fantastic noise filter 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.
    Date published: 2010-05-03
    Rated 5 out of 5 by from Works great! Solves the digital noise issues between my computer's sound card and my audio interface without degrading frequency response.
    Date published: 2010-06-14
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