How do I use Spectra Plus FFT and a RS meter to measure my sub?

Discussion in 'Archived Threads 2001-2004' started by Anthony_Gomez, Dec 5, 2001.

  1. I think I have all I need to measure my sub, but I am not sure how I am supposed to do it.

    Anyone care to give me a leason?

    Thanks=)
     
  2. BruceD

    BruceD Screenwriter

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    I've never used spectra plus, but the other free software (ETF) at
    software
    generates it's own MLS (Multiple Length Sequence) test signals that are;
    1) output from your PC soundcard's LINE-OUT (Left or Right Mono)
    2) into your amp's (or preamps) LINE-IN (Left or Right)
    3) picked up by the RS SPL meter's mic whose RCA out is connected to the PC soundcard's LINE-IN (Left or Right)
    4) the PC software then calculates and displays graph
    Connections:
    1) PC soundcard Left RCA LINE-OUT -> Amp Left RCA LINE-IN
    2) PC Soundcard Left RCA LINE-IN PC soundcard Right RCA LINE-IN
    This tests each speaker's response in the room one at a time.
    BruceD
     
  3. Dustin B

    Dustin B Producer

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    Question. Using this connection method is it possible to check the surround channels individually?

    Is it possible to use a digital out (provided your sound card has one) to check each and every channel?
     
  4. BruceD

    BruceD Screenwriter

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    Dustin,

    The setup is designed to measure each individual speaker's response in the room, one at a time. So yes, each individual surround can be checked. The software will even calculate the distance from each surround to the listening position.

    To do this simply connect each analog RCA IC going to a 5 channel amp (one at a time) to the LINE-OUT on the PC soundcard and then measure each one.

    The MLS signal generated by the software is designed to output through the analog ports of the soundcard (full-duplex soundcard), it's not designed to work through the digital out.

    BruceD
     
  5. Dustin B

    Dustin B Producer

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    Duh, now I feel stupid :b
     

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