© 2004 Wohler Technologies Inc. ALL rights reserved
4
AMP1-VS and AMP1-VSA
User Manual P/N
821613
, Rev-
B
Features
AMP1-VS and AMP1-VSA
Powered Digital Audio Monitors
Description
Section 1:
Features , Specs, and Installation
AMP1-VSA Front Panel
The rackmountable 1U size
AMP1-VS
and
AMP1-VSA
models are audio monitors capable of audibly monitoring up to four source
channels through their stereo speaker systems while simultaneously visually monitoring all four channels of the selected source via
four high-resolution 26-segment LED bargraph level meters. Both models monitor
SDI
(
Serial Digital Interface
) audio sources
while the
AMP1-VSA
model can also monitor up to four
analog
audio sources. 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.
SDI
signal
status is indicated by a bi-color (red/green) LED. Wohler Technologies proprietary three-LED stereo phase indication feature allows
monitoring of phase relationships between the left and right speaker channels. Other features include separate 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.
The rear panels of both the
AMP1-VS
and
AMP1-VSA
feature one
SDI
input and one
SDI
output on unbalanced BNC connectors,
four
analog
outputs (de-embedded from the
SDI
source) on four Phoenix connectors, and left and right
analog
outputs (of the
channels assigned to the left and right speakers) on two balanced XLR connectors. The
AMP1-VSA
model additionally features
four analog inputs on Phoenix connectors on the rear panel and a toggle switch on the front panel to allow selection between
analog
or digital
SDI
input sources.
All
AMP1 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 two speakers) that handles
summed Low Frequency (LF) information below the 500 Hz crossover point. The
AMP1 Series
unique audio design 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.
• Two banks of four push buttons for assigning single or
summed channels to the left and right speaker
• Headphone output
• Power indication LED
• SDI input and SDI re-clocked output on unbalanced BNC
connectors
• SDI signal status indication LED
• Analog inputs on four balanced Phoenix connectors with digital/
analog source select switch on front panel (-VSA only)
• Analog outputs (converted from the SDI input) on four
Phoenix connectors
• Analog outputs of sources selected for speaker monitoring
on two balanced XLR connectors
• Quick and easy installation: simply slide in the rack and
connect audio and AC power
• Numerous control and input options
• 98 dB SPL at two feet
• Only one rack space 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 26-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, DIN, or Custom)
