VMDA-4 audio monitor 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 four stereo analog or AES audio sources.
Individual lighted push buttons select and indicate which of the four 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 Wohler Technologies popular
The summed bass feature is important for audible detection of out-of-phase conditions.
Speaker amp 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.
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.
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.
lighter weight and shallower-depth chassis (compared to similar-type
units) make it ideal for use in portable and mobile vehicle