Zoom Q3HD audio volume when using an external MIC

Discussion in 'Amateur Video Production' started by liu, Apr 14, 2011.

  1. liu

    liu Guest

    We purchased this camera for training video. The audio quality with
    its built-in is good as advertised. When we tried to use an external
    mic, the volume was really low at ~ -40db. What is your experience on
    this? I wonder if we got a lemon.

    THANKS!
    liu, Apr 14, 2011
    #1
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  2. liu

    Paul Guest

    liu wrote:
    > We purchased this camera for training video. The audio quality with
    > its built-in is good as advertised. When we tried to use an external
    > mic, the volume was really low at ~ -40db. What is your experience on
    > this? I wonder if we got a lemon.
    >
    > THANKS!


    http://www.zoom.co.jp/english/products/q3hd/

    "Input LINE IN (1/8" Stereo phone jack)"

    That's not much to go on, but that implies a line level microphone,
    which might be about 1V rms or so. It also doesn't state
    whether it provides mic bias, to power a condenser mic
    (similar to the two condensers mounted in the upper housing).

    There are some suggested voltage values here, for line level.

    http://en.wikipedia.org/wiki/Line_level

    USA professional audio +4 dBu 1.228 Vrms (approximate)
    Consumer audio −10 dBV 0.316 Vrms

    The Zoom product should make statements along those lines,
    to help consumers.

    It could mean, you're missing a microphone preamp in your kit bag.
    A preamp may be necessary, to get from microphone level to line level.

    Paul
    Paul, Apr 14, 2011
    #2
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