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ART DTI

Discussion in 'Sound, Music, and Intercom' started by 2mojo2, Jan 20, 2009.

  1. 2mojo2

    2mojo2 Active Member

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    I am looking for isolation transformers to connect long balanced lines to short unbalanced lines. I came across the ART DTI which looks like a nice two-channel package for about sixty bucks.
    Does anyone have experience with these?
     
  2. avkid

    avkid Not a New User Fight Leukemia

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    ART has a tendency to use the cheapest parts possible.

    It will probably work, but don't expect it to last forever.
     
    2mojo2 and (deleted member) like this.
  3. FMEng

    FMEng Well-Known Member Fight Leukemia

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    Transformers are great problem solvers, but there are a bunch of crappy ones on the market. Ebtech comes to mind as one of the suspect ones. A cheap transformer will not handle high audio levels without saturating the core, especially at low frequencies. The result is distortion. If the manufacturer does not spec the maximum level (in dBu) and the distortion at that level (<1%) , assume it's poor. Balanced line level can easily reach peaks of +18 dBu to +24 dBu.

    Looking at ART's product on their web site, to their credit, they do include the max level/distortion specs, and they look decent. They claim <0.05% at 24 dBu, at 100 Hz. It's nice to see that, and I would say go for it for $60.

    Applied Research & Technology: ARTcessories™

    THE renowned audio transformer company is Jensen Transformers. I totally trust their products and use many of them, and they always sound great when they are applied properly. They are not inexpensive, however.

    JENSEN TRANSFORMERS, INC. - ISO-MAX® Audio Isolator Products

    Generally speaking, put the transformer next to the input, not the output. Most transformers are not great at driving the capacitance of a long piece of cable, unless they are specifically designed to do so.
     
  4. rwhealey

    rwhealey Active Member

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    We use a Jensen transformer to do exactly the job you've described. I've got it on the send for a VHS recorder in our light booth.

    Unfortunately, we really needed two (one for the audio out of the video system), so we still have a buzz problem.

    The VHS audio is nice and clear.
     

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