WTB: Jensen Isomax PC-2XR

Discussion in 'Closed (Archived) Sales' started by gaspasser, Jan 13, 2019.

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  1. rlow

    rlow A happy woofer

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    Your version is probably good actually and maybe the best one. This is what is says on the Jensen isolator page I found about your model:

    The 1:1 ratio output type transformer inside has the least passive losses of the three types, and will eliminate 60 Hz ground loop noise. However, since the output transformer does not have an internal Faraday shield like the PI-2XX and PB-2XX, higher frequency "buzz' noises will pass through, making the PO-2XX the least effective of the three for eliminating noise problems. The PO-2XX can be used at either end of a long cable run, but is best used at the start of the run. (Formerly DM2-2XX)​

    So seems like Faraday shield may not be on the PO version, but maybe the PI version is not as transparent.
     
  2. Scott Kramer

    Scott Kramer Friend

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    Honestly not sure, hope I made the correct choice. As you know, this is to utilize ya2 balanced, not a noise issue.

    Edit:
    Cool... actually like this, potentially less dicking around with the highs?
     
    Last edited: Jan 17, 2019
  3. atomicbob

    atomicbob dScope Yoda

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    Based on the picture you posted you obtained a box with Jensen JT-11-DMPC transformers. They are 1:1 turns ratio. More information may be found here:
    http://www.jensen-transformers.com/wp-content/uploads/2014/08/jt-11-dmpc.pdf
     
  4. Abhishek Chowdhary

    Abhishek Chowdhary Friend

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  5. msommers

    msommers High on Epipens

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    This is probably a stupid question but I'll ask anyways lol...

    In the audio world, why would someone want a 4:1 ratio? Like is the gain that high or low that they need that big of a change?
     
  6. rlow

    rlow A happy woofer

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    From the top of the PC-2XR product page:

    The Iso•Max PC-2XR is a two channel pro-to-consumer isolator that is used to convert a +4 dBu line-level device to -10 dBV for consumer-level signals such as connecting the balanced output from a mixing desk to the unbalanced input of a hand-held video recorder or lap-top computer.

    So to go from a hot pro balanced output to an unbalanced consumer input.
     
  7. atomicbob

    atomicbob dScope Yoda

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    It will convert balanced to unbalanced but you won't like it.

    Here are the specifications shown on Neutrik's product page:
    Audio transformer 1:1
    Impedance ratio: 200:200
    Source/load impedance in Ohm: 200/2k, (600/10k)
    Max. Input level (@ 50 Hz, 1% THD): -3 dBu

    Look carefully at that last one. 50 Hz, 1% THD at -3dBu.

    Most of you are looking to take +12 to +22 dBu outputs and send them to unbalanced headphone amp inputs. That saturation at -3 dBu guarantees rather large coloration to hot signals. Bass guaranteed to be highly distorted unless signal levels are kept at much lower level of -15 to -12 dBu with peak to avg of 10 dB.
     
  8. JK47

    JK47 Guest

    Dangerous Meme Convert 2 -->Jensen PC-2XR -->Pioneer Meme-22 -->95dB efficient speakers= attenuation knob on DMC-2 rarely going past 9-10 o'clock.

    The DMC-2's hot signal straight into my Aficionado works quite well with the 95dB speakers, giving more room to play with volume on anti-loudness war tracks. Some tracks needed to be cranked past 3 o'clock prior to the DMC-2's arrival.

    I had the PC-2XR sitting around unused from when I had a Gumbroni and Black Widow a few years back.

    EDIT: It did sound a tiny bit different in the BW and GMB setup, but not enough to accurately describe or reliably A/B between the GMB feeding the BW by way of XLR/PC-2XR vs SE.
     
    Last edited by a moderator: Jan 18, 2019
  9. gaspasser

    gaspasser Flatulence Maestro

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    Did you feel it made much of a difference in that setup?
     
  10. Baten

    Baten Friend

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    Someone in the RME thread recommended this cheap box http://www.artproaudio.com/product/dti-dual-transformer-isolator/

    Compared to the neutrik it looks all right? Very easily acquired compared to the Jensens, too...
     
  11. Abhishek Chowdhary

    Abhishek Chowdhary Friend

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    Transformer quality is heart of this product and Chinese trafos don't inspire confidence.
    Should work better than neutrik though where -3dbu is too weak input as Atomicbob highlighted
     
  12. atomicbob

    atomicbob dScope Yoda

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    +4 dBu (pro audio levels) to -10dBV (consumer audio levels) is 11.79 dB apart which works out to a ratio of 3.89:1, very close to 4:1.

    Here is a possibly useful link:
    https://www.bhphotovideo.com/explor...humored-attempt-demystifying-10-dbv-and-4-dbu

    As mentioned above, transformer quality, and size have a big influence on performance. Physics is a bitch. Tubas are much bigger than flutes. Woofers are much bigger than tweeters. If you want high signal level low frequency audio performance the transformers must be necessarily large. With quality comes a price. Cinemag, Jensen and Lundhal make the best transformers. Whirlwind is one of the companies next in the food chain. ART has usually been much lower on the food chain.
     
  13. gaspasser

    gaspasser Flatulence Maestro

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    Thanks everyone for weighing in. I have a DIY box with Jensen transformers that I got from @willsw to try out.

    Please close @shotgunshane, thanks for your services in the market.
     
  14. Scott Kramer

    Scott Kramer Friend

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