Section 1: Features, Specs, And Installation - Wohler AMP2-VSD User Manual

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B
The AMP2-VSD and AMP2-VSDA are monitors capable of audibly monitoring up to four source channels through a stereo
speaker system while simultaneously visually monitoring all four channels of the selected source via four high-resolution 53-segment
LED bargraph level meters. Both models process digital AES and SDI audio signals, while the AMP2-VSDA is also capable of
processing up to four analog audio signals. Two banks of four buttons on the front panel are used to independently assign from one
to four (summed) channels to each of the two (left and right) speaker channels. AES signal status is indicated by two bi-color (red/
green) LEDs. SDI signal status is indicated by one bi-color (red/green) LED. Features include a ganged stereo volume control and
balance pot, power indication LED, and headphone output. Output limiter circuits are incorporated to protect the speakers, and
extensive magnetic shielding allows placement immediately adjacent to video monitors with no color impurities. Wohler Technologies
proprietary three-LED stereo phase indication feature allows monitoring of phase relationships of the selected stereo inputs.
Rear panels for these monitors feature an SDI input and loop-through on BNC connectors, two AES inputs on unbalanced BNC
connectors, two alternate AES inputs on balanced XLR connectors, two AES outputs (converted from the SDI input) on BNC
connectors, and a stereo analog output of the channels assigned to the left and right speakers on two balanced XLR connectors. The
AMP2-VSDA additionally features four analog inputs on balanced female XLR connectors.
All AMP2 Series units contain three audiophile-quality drivers and three power amplifiers; two amplifiers (and two speakers) that
reproduce midrange and high frequency information in stereo, and a third amp/driver combination (and speaker) that handles
summed Low Frequency (LF) information below the 500 Hz crossover point. The AMP2 Series unique audio design has two
important advantages. First, it provides optimally focused sound in an Ultra Near Field
higher SPL for the operator while reducing overall ambient sound and adjacent bay crosstalk. Second, electronic rather than
acoustic cancellation of bass frequencies provides positive audible detection of reversed polarity ("out of phase") audio feeds.
• 104 dB SPL at two feet
• Only two rack spaces high
• Excellent high frequency response for positive detection of
background whine and noise
• Audible and visual indication of phase/polarity problems
• Thorough magnetic shielding for placement next to video monitors
• Four 53-segment high-resolution tri-color bargraph level meters:
-Selectable Input Referrence Level (0, +4, +6, or +8 dBu)
-Selectable Display Mode (VU Only, VU/PPM, or PPM Only)
-Selectable Peak Hold (Manual, 3-Second, 10-Second, or Off)
-Selectable PPM Ballistics (Type I, Type II, DIN 45406, or
SSRT)
-Selectable alternate Bargraph Scales (Extended VU, VU, BBC,
NORDIC, or DIN)
-Selectable Phase Correlation feature
• SDI input and loop-through on unbalanced BNC connectors
4
AMP2-VSD and AMP2-VSDA
Powered Audio Monitors
AMP2-VSD Front Panel
AMP2-VSDA Front Panel
Description
Features
© 2004 Wohler Technologies Inc. ALL rights reserved

Section 1: Features, Specs, and Installation

tm (1 to 3 feet) environment. This allows
• Two AES/EBU inputs on unbalanced BNC connectors
• Two alternate AES/EBU inputs on balanced XLR connectors
• Four analog inputs on balanced XLR connectors (AMP2-VSDA
only)
• Two AES outputs (converted from SDI input) on BNC
• Four analog outputs (from selected digital source) on Phoenix
• Stereo analog output of the channels monitored by the left and
right speakers on two balanced XLR connectors
• Two banks of four push buttons for assigning single or
summed channels to the left and right speaker
• Select AES or SDI input source via a front panel toggle switch
• Select analog or selected digital source via front panel switch
• One SDI signal status/error indication LED
• Two AES signal status/error indication LEDs
• Headphone output
• Power indication LED