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"Hiss" from my new Focusrite VM Pro

Discussion in 'Pro Audio Equipment' started by JoeW, Jan 6, 2005.

  1. JoeW

    JoeW Guest

    I've been having trouble getting a clean signal on this new equipment. Here's the chain...

    CAD M9 tube mic > Focusrite VM Pro > Edirol UM-25 > computer Hard drive located in the next room. Pretty simple, yes?

    The cabling from the Cad mic into the VM pro is a balanced XLR, and from VM Pro to Edirol is balanced XLR also.

    Doing straight voice/narration I would expect a nice clean sound (using no compression or other processing offered by the pre.)

    Instead, what I've been getting is a very noticable background "hiss" - sounds almost like tape hiss. This is in a small 7X10' sound-proofed room...no external noise coming in to explain this "hiss" sound. The computer is in the next room.

    I am monitoring this on line level output to headphones, directly out from the A/D interface.

    If I bypass the pre and take the mic directly to the Edirol A/D via balanced XLR, "voila", I get a very clean, nice signal with none of the hiss. The hiss goes away...no noise.

    The sales guy where I bought the equipment suggested that there was some impedence mismatch in using an XLR from the mic to the pre and then from the pre to the A/D, and suggested I try using the balanced TRS patch cable instead.

    I'm skeptical...wouldn't a balanced TRS give the exact same signal as a balanced XLR?? Just different plugs...right?

    I am begining to think the Voicemaster Pro is defective. Just to be sure, I've ordered a TRS balanced cable that I will try, just to eliminate that possibility.

    Does any of this make sense?

    All ideas appreciated!!

  2. StevenGurg

    StevenGurg Guest

    Dear Joe, a little over a year ago, I had the same experience with a Focusrite Voicemaster Pro I received from ZZounds. I tried what I could, and after speaking with Zzounds they recommended that I return it, which I did. It turns out the unit was defective. I bought a UA6176 instead and was greatly pleased.

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