TEF25  USB Preamplifier

A Powerful New Tool For Acoustical Analysis

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TEFPRE Front Panel View
  • Portable Dual Channel Analyzer.
  • USB / DC Powered.
  • Extremely Low Noise Floor.
  • Post Processing of TDS and MLS.
  • Accurate Phase Measurements.
  • Utilizes Existing TEF Software.

  • The TEF25 USB Preamp combines the portability of a small USB Preamp with the accuracy of the traditional TEF20 analyzer, in an affordable package. The TEF25 comes with the SoundLab SLUPG1 Software Upgrade that lets you run all previously owned TEF20 programs: TDS, MLS, RTA, PEQ, PLR and SLX. Run the older Versions or step up to new Version 6 modules! Available in Version 6 is the new Post Processing Module, SLPPS60. Also included is the TEF Training Class 3-DVD Set that contains the topics from the TEF Level I class.

    Why use a TEF25? Click here for some TEF Talk.

    Now also available are a number of product mixes offered in KIT form.
    Click here to see the complete selection of new TEF Kits.
    Click here to go to the TEF Sound Lab Software Library.
    Download TEF25 Brochure in PDF format here.
    In English.
    In Japanese.

    You will need a copy of the Adobe® Acrobat® Reader to view it.

    A Faster way to Make Measurements

    Need a faster way to check for common problems in small acoustical spaces? Need to do calibration for surround sound? EZTUNE combines features from several existing TEF programs, and then adds a layer of automation to speed up typical tasks. For those who wish to change standard settings, you are free to do so. Or, if you need to send staff into the field, let them use the default settings to quickly collect or evaluate a room or sound system.

    EZTUNE is available as a software module (EZTH2) that can be ordered with the EZTUNETH2 Kit.
    Click (here) to see the complete selection of TEF Kits.

      Some TEF EZTUNE Features

    1. Set Reference Levels. A large SPL display shows the C weighted SPL. A colored background starts out blue, changes to Green as you approach the home theater reference level of 75dB and then turns red if you go above 76dB SPL.
    2. Measure Real Time Analysis. A powerful RTA module allows you to choose resolutions from 1 octave to 1/24th of an octave. Select various decay speeds, or use the THX recommended 20 second time averaging for best accuracy with pink noise. Display NC values in octave band mode.
    3. Measure Reflections. While some of our competitors make pretty pictures and claim that they have time domain capability, EZTune utilizes TDS to resolve events down to 26 microseconds. Clicking on the Reflections button automatically finds the time of arrival for the direct energy, then shows you which peaks are significant specular reflections. Easy to read graphics show the time of arrival for each reflection along with its path length. An overlay mode makes it easy to see when acoustical treatments have successfully absorbed a reflection.
    4. Measure Frequency Response. By pressing the Frequency Response button, the system will automatically identify the location of the microphone in the room, and then calculate the frequency response, phase and comb filters caused by specific reflections.
    5. Predict Optimal EQ. By combining powerful aspects of our TEF Precision Equalization software (PEQ) with the automation in EZTune, we have developed the fastest, easiest way to measure a sound system and then to choose optimal settings for equalization. The display shows both the frequency response, and a list of center frequencies for filters, filter Q and the recommended amount of cut or boost at each frequency.
    6. McSquared Modal Calculator. Our good friends at McSquared Consulting have provided us with the use of their powerful room mode calculator, which allows the user to quickly visualize the effects of room modes based on the room dimensions.

    Typical Screen Captures
    Measuring Reflections
    Measuring Reflections
    spacer52.gif - 248 Bytes
    Predicting Optimal EQ
    Predicting Optimal EQ

    TEFPRE Rear Panel View  INPUTS:  3 Pin XLR/Phone Combo Jacks
     OUTPUTS:  3 Pin XLR
     POWER:  USB type B and 2.1mm jack

    A/D 24 Bit - 48kHz to 192kHz Selectable
    D/A 24 Bit - 48kHz to 192kHz Selectable
    DSP 75mHz 75 MIPS
    Frequency Response 6Hz to 90kHz 1dB
    Signal to Noise > 114dB Unity Gain, ref +4dBV, 1kHz
    THD + Noise < 0.1 +4dBu 1kHz
    Noise Floor -130dBV  
    Dynamic Range > 114dB  
    Gain 60dB Selectable Stages, 1dB steps
    Channels 2 Analog Input, Output
    External Power** 12vdc @ 500mA 2.1mm jack - sleeve positive
    USB 2.0 Compliant  
    Approvals - CE Mark Emissions: - EN 55022 Class A
    Immunity: - EN 55024 Class A
    FCC Class B
    XLR Active Balanced/20k Ohms Pin 2 Hot, Per AES Standards
    TRS Active Balanced/20k Ohms Tip+, Ring-, Shield (20dB Pad)
    XLR +4 dBV Max Level
    TRS +24 dBV Max Level
    XLR Active Balanced / < 100 Ohms/Leg Servo Balanced
    +24vDC   Without External Power
    +48vDC   With External Power
    On / Off   Software Selectable
    Processor Pentium 4 @ 2GHz Core Duo @ 1.5Ghz
    Operating System Win 2000, XP, Vista, Win7  
    RAM 512Mb  
    Case Extruded Aluminum Black Finish
    Panels Aluminum Black Finish
    Size / Weight 6.75"(W)x 5.25"(L)x 2.25"(H) 2 lbs.
    **In normal usage, no external power is required, other than connection to the USB port on a Computer.
    Drivers are currently for use with TEF measurement Software.

    Gold Line, TEF, TEF25 and TEFPRE are trademarks of Gold Line Connector, Inc.

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