Wohler VMDA-4 2-Channel Multi Format Audio Monitor

Wohler VMDA-4 2-Channel Multi Format Audio Monitor

Wohler VMDA-4 2-Channel Multi Format Audio Monitor

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Wohler VMDA-4 overview

  • 1Description

The VMDA-4 2-Channel Multi Format Audio Monitor from Wohler Technologies permits selectable monitoring of analog or AES sources, with excellent full-range fidelity far exceeding that of an ordinary monitor in a 1U rack-size. The unit monitors up to 4 stereo analog or AES audio sources. Individual lighted push buttons select and indicate which of the 4 sources is being monitored. Two or more pairs of the analog inputs may be summed (as pairs) by pressing the desired buttons simultaneously (note that AES inputs cannot be summed).

A separate lighted push button switches between the selected analog or digital source(s). Two front-firing midrange-tweeter speakers and a compact high-performance woofer are arranged in the bi-amplifier design. The summed bass feature is important for audible detection of out-of-phase conditions. Speaker amplifier limiters prevent accidental damage to speakers from high input levels.

Volume and Balance controls are standard, but can be reconfigured as A volume/B volume via an internal jumper. A front panel mute function is engaged by tapping the Analog/Digital selector button briefly. The button’s light blinks while speakers are muted. Muting may also be activated from a switch remoted from the rear panel. Electronic rather than acoustic cancellation of bass frequencies provides positive audible detection of out of-phase (reversed polarity) audio feeds. The VMDA-4 also features 10-segment LED bargraph meters that provide visual indication of input levels. Fast and averaging phase LEDs gives visual alert of out-of-phase conditions, and indicate whether the source is stereo or mono. A three-way toggle switch selects between the analog or digital inputs. Muting may also be activated from a switch remote
from the rear panel (optional extra). An auxiliary analog output of the selected analog or digital source is provided on the rear panel.

The unit is completely magnetically shielded to allow interference-free operation immediately adjacent to all CRT video monitors. Its lighter weight and shallower-depth chassis (compared to similar-type units) makes it suitable for portable and mobile vehicle applications.

Only 1RU
Powerful 96 dB SPL at 2' (0.6m)
Two 10-segment VU level meters
Phase /polarity indication
Headphone jack mutes speakers
Blowout-proof speakers
Thorough magnetic shielding allows placement next to video monitors.
Select from analog or digital sources
In the Box
Wohler VMDA-4 2-Channel Multi Format Audio Monitor
  • AC Power Cord
  • Limited 1-Year Warranty on Parts & Labor
  • Note: The warranty can be automatically extended, for audio products only, to a 24 month warranty by registering the serial number of your product online at Wohler's website within 6 months of shipment.)

    Table of Contents
    • 1Description

    Wohler VMDA-4 specs

    Input 8 x Balanced analog inputs on Mini-Phoenix
    4 x Unbalanced AES input pairs on BNC
    4 x Balanced AES input pairs on Mini-Phoenix
    Output 2 x Balanced analog outputs from selected source on Mini-Phoenix
    AES/EBU Input Termination Balanced: 110 Ω
    Unbalanced: 75 Ω
    Level Meters Vertical: 2 x 10 Segments
    Sampling Rate 32 to 48 kHz, auto-detecting
    Level Meter Scale +3 to -20 dB
    Analog Input Impedance >100 kΩ balanced
    Input Impedance AES Input Impedance
    Unbalanced: 75 Ω
    Balanced: 110 Ω
    Level Meter Dynamics VU or PPM: DIP selectable swwxdfzubzstwbasuyczduewdvyutawffeyvwx

    Factory setting is VU

    Level Meter Resolution 1 dB
    Level Meters Level Meter Type: LED bar graph
    LED LED Color: Tri-color (red, amber, green)
    Metering Range 23 dB
    Magnetic Shielding < 0.2 gauss any adjacent surface
    Aural Sound Outputs Wohler speaker system, headphones, mute speakers
    Distortion Acoustic Distortion: Typically <2.0% at any level below limiting, 100 Hz to 15 kHz
    Electrical Distortion: <0.3% at any level below limit threshold
    Frequency Response 1/6 Octave 60 Hz to 16 kHz (+ or -6 dB)
    Peak Acoustic Output at 2 feet 96 dB SPL
    Hum and Noise Better than -70 dB below full output
    Power Requirements Power to the unit is 100 to 240 VAC ± 10%, 50/60 Hz
    Power Output RMS each side (4 Ω)
    Transient: 20 W
    Continuous: 11 W
    10 W RMS left and right(4 Ω)
    Peak:14 W
    Power Consumption 70 W
    Space requirements 1 RU
    Rack Height 1 RU
    Dimensions 1.75 x 19.0 x 9.0" (44.5 x 483.0 x 246.0 mm)
    Weight 10.0 lbs (4.5 kg)
    Packaging Info
    Package Weight 9.8 lb
    Box Dimensions (LxWxH) 22.2 x 12.4 x 5.7"

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