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The compact and light VMMDA-1 2-Channel HD/SD-SDI, AES, and Digital / Analog Audio Monitor from Wohler Technologies is a compact and lightweight unit offering full-range fidelity. Two front-firing midrange tweeter speakers and a compact high-performance woofer are arranged in its bi-amp design. The speaker systems are protected against blowout by limiters. The summed bass feature allows for audible detection of out-of-phase conditions.
Electronic rather than acoustic cancellation of bass frequencies provides positive audible detection of out-of-phase (reversed polarity) audio feeds. The unit features two 10-segment VU LED bar graph level meters. Fast and averaging phase LEDs give visual alert of out-of-phase conditions. A 3-way toggle switch selects between the analog or digital inputs.
Muting may also be activated from a switch remote (sold separately) from the rear panel. An auxiliary analog output of the selected analog or digital source is provided on the rear panel.
This VM Series monitoring unit is magnetically shielded to allow interference-free operation. Its lightweight and shallow depth chassis makes it suitable for use in portable and mobile vehicle applications.
Only one rack space high, but produces a powerful 96 dB SPL at 2'
Electronic power output limiting prevents speaker blowout
Thorough magnetic shielding allows placement next to video monitors
Headphone jack with speaker muting
Balanced analog inputs
AES input on balanced Phoenix connector and unbalanced BNC connector
Selectable termination on AES input
Balanced stereo analog output of selected source
Lightweight and shallow-depth chassis
Internal universal AC mains power supply
Two 10-segment LED bar graph audio level meters
Phase and power indication LEDs
Volume and balance controls (jumper configurable as A volume/B-volume by specifying the option SVC)
Monitors analog, AES, and SD-SDI or HD-SDI audio sources
Source selected using a front panel 3-position toggle switch (analog, AES, or SDI)
One of 8 channel pairs from SDI groups 1 to 4 selectable with front panel rotary switch (when SDI is the selected source)
LED indicates SDI lock status
Two analog inputs on Phoenix connectors
Applications: Suitable for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia systems, satellite links, cable TV facilities, and on-air radio studios
In the Box
Wohler VMMDA-1 2-Channel HD/SD-SDI, AES, and Digital / Analog Audio Monitoring Unit (1 RU)
AC Power Cord
Limited 1-Year Warranty on Parts & Labor
Table of Contents
2 Analog: mini Phoenix (balanced)
1 AES: mini Phoenix/BNC
1 SDI/HD-SDI: BNC
Analog Input Impedance
>100 kΩ balanced
2 Analog (Selected): mini Phoenix
1 SDI (re-clocked): BNC
AES/EBU Input Termination
Balanced: 110 Ω Unbalanced: 75 Ω
Digital Input: 32 to 48 kHz, auto-sensing
SDI Input: 48 kHz
Analog Input Impedance
Analog Input Impedance: >100 kΩ balanced For AES Input Impedance 75 Ω Unbalanced: 75 Ω Balanced: 110 Ω
For full output (volume full on): 0 dBv balanced (analog); 20 dBfs (digital)
Hum and Noise
Better than -70 dB below full output
Acoustic Frequency Response
60 Hz to 16 kHz (± 6 dB)
Maximum: 96 dB SPL at 2.0'(60.9 cm)
Speaker Outputs: Less than 0.3% at any level below limiting threshold
Typically <2% at any level below limiting, 100 Hz to 15 kHz