© 2004 Wohler Technologies Inc. ALL rights reserved
4
AMP2-VS and AMP2-VSA
User Manual P/N
821583
Rev-
A
Features
AMP2-VS and AMP2-VSA
Powered Audio Monitors
Description
Section 1:
Features, Specs, and Installation
AMP2-VS Front Panel
• SDI input and loop-through on unbalanced BNC connectors
• Four analog inputs on balanced XLR connectors (-VSA only)
• Four analog outputs (converted from SDI input) 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 SDI or analog inputs via toggle switch (-VSA only)
• One SDI signal status/error indication LED
• Headphone output
• Power indication LED
• Volume control
• Balance control
• 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 with:
-
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
The
AMP2-VS
and
AMP2-VSA
are monitors capable of audibly monitoring up to four source channels de-embedded from an
industry standard SDI bitstream 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 will monitor industry standard SDI
digital audio signals, while the
AMP2-VSA
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 speaker channels
(left and right). SDI signal status is indicated by one bi-color (red/green) LED. Features include volume and balance controls,
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 visual monitoring of phase relationships of the signals assigned to the
left and right speaker channels.
The rear panel features an
SDI
input and loop-through on BNC connectors, four
analog
outputs (converted from the
SDI
input) on
Phoenix connectors, and a stereo analog output of the channels assigned to the left and right speakers on two balanced XLR
connectors. The
AMP2-VSA
additionally features four
analog
inputs on balanced female XLR connectors and a front panel switch
for selection between
SDI
and
analog
inputs.
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 unique audio design of these monitors has two
important advantages. First, it provides optimally focused sound in an Ultra Near Field
tm
(1 to 3 feet) environment. This allows
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.
AMP2-VSA Front Panel
