• Portable 30 channel digital 1/3 Octave Analyzer.

  • DSP30/30B/30BP microphone measurement range is 27dB to 125dB.

  • Captures full 85dB window with scales from ¼ to 5dB.

  • Filters exceed ANSI specs.

  • Comes with RS232 computer interface.

  • A Demo Program is available. Download it here.

  • Click here to read a review by Jim Gundlach, noted audio consultant.
  • The DSP30 analyzes The NBA Finals at the Meadowlands! ( full story)
  • STI Measurement Technology Covered By
    U.S. Patent 6,792,404

    The following standard features are supplied..

    • DSP30: Model MK8A - 600 ohm omni-directional electret condenser instrument microphone.
    • DSP30B: - With Intelligibility Package - Model TEF04 instrument microphone, Serial port, OPTSTIcis tm CD, Rugged carrying case.
    • DSP30BP: - With Intelligibility/Privacy Package - Model TEF04 instrument microphone, Serial port, OPTSTIcis tm CD, Rugged carrying case.
    • An 85dB window not limited by the display.
    • Automatic Sum & Average function to normalize readings and stabilize pink noise.
    • 60 active memories.
    • IEC Flat, A, C or User designated curves.
    • A Sum mode to sum and average response curves.
    • A Subtract mode to subtract one memory from another.
    • Keypad selectable filters: ANSI triple tuned or sharper for notching applications.
    • Scales from ¼dB to 5dB.
    • Multiple plot function.
    • Export file function.
    • Optional expansion features can be added anytime.

    • Also available in Computer Interface Only (DSPCIW) models.
    • All DSP series units can be interfaced with a computer using the RS232 port and available software.


    Measurement Range:
  • Microphone input: DSP30/30B/30BP: 27dB to 125dB SPL
  • Line input: -88dBu to +14dBu (.031mV to 3.88V rms)
  • Measurement window: 85dB
  • Inputs:
    • Microphone: Balanced, XLR 3 pin receptacle
    • Line: Unbalanced ¼" phone jack. 15k ohm impedance.
  • None (standard)
  • Printer port: DB25F (optional)
  • RS232 port: DB25M (optional), Standard on DSP30B/BP
  • Center Frequencies:
  • ISO 1/3 octave between 25Hz - 20kHz.
  • Center Frequency Accuracy:
    • typically ±1%.
    Relative Flatness Channel to Channel:
  • 1/4dB.
  • Displays:
    • Audio Spectrum, 30 channel, 10 LEDs per channel, all channels scalable in ¼, ½, 1, 2, 3, 4, or 5dB SPL.
    • SPL & Reference readings are 3 digit via 7 segment LED readout.
  • ANSI standard (triple tuned) & sharper than standard for notching applications.
  • Weighting:
  • IEC A, C, Flat or USER defined.
  • Decay Rate:
  • Fast = 34.7dB/s, Medium = 8.7dB/s, Slow = 4.3dB/s
  • Function Control:
  • 16 button keypad.
  • Power Requirements:
  • Batteries: Eight "AA" alkaline or nicad..External: 12Vdc @ 500mA via 2.1mm jack
  • Approvals: - CE Mark
  • Emissions: - EN 55022 B - FCC Class B
  • Immunity: - EN 55024 B
  • Size (W x H x D); Weight:
    • 10" x 10 ¼" x 2 ½"; 2 lbs.
    Case Material:
  • High Impact ABS.


    How to install the Demo Program
    Demo Program Win_Demo.Zip 192K zipped.

    pdf Download documents in Adobe® PDF format.
    You will need a copy of the Adobe® Acrobat® Reader to view it.

    DSP30 Manual 914K unzipped.
    DSP30 Article by Jim Gundlach. 17.3K unzipped.

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    How To Install the Demo Program

    Download file Win_Demo.Zip to a directory of your choice.
    UnZip the file to a blank, formatted, floppy diskette.
    With the floppy disc in the A: or B: drive:

    For WIN3.xx - In program manager, select FILE, RUN
    Type A: or B:Install
    Click OK.

    For WIN95/98 - Click START, RUN
    Type A: or B:Install.exe, Click OK.