Wohler AMP1-DA/106 User manual

the video division of
2-CHANNEL AUDIO MONITOR
AMP1-DA/106
Order Part Number
AMP1-DA/106: 8101-0020
Description
The AMP1-DA/106 provides self-powered, full-fidelity
stereo audio monitoring of 2 channels from analog
and AES/EBU Digital sources and ultra-high
resolution LEDs with 106 segments in the smallest
rack space possible.
This unit contains four high performance transducers
driven by three power amplifiers: one amplifier/driver
combination handles midrange and high frequency
information in stereo, while the second handles
summed low frequency information below the 500 Hz
crossover point.
The unique design provides optimally focused sound
for operators in an ultra near field (1 to 3 ft.) working
environment and offers performance comparable to
that of many separate monitor pairs, yet does so
without the installation hassles, awkward speaker
placements and “added-on” look. This provides for a
higher SPL for the operator while reducing overall
ambient sound and adjacent bay crosstalk.
The level meters are now available with a choice of
BBC, DIN, Nordic and VU scales and PPM Only.
Extended HF response reveals potential problems
with audio whine or hiss and electronic rather than
acoustic cancellation of bass frequencies provides
positive audible detection of out-of-phase (reversed
polarity) audio feeds. A headphone jack is provided on
the front panel, usage automatically mutes the
speakers.
Output limiter circuits are incorporated to protect the
speakers, and extensive magnetic shielding allows
placement immediately adjacent to video monitors
with no color impurities.
Our unique tri-color LED design means we can offer
an almost unlimited variety of options such as phase
correlation, peak hold, loudness, sum and difference,
and alternate scales and color mappings. The
standard display mode is set as a single segment
PPM “dot” above a VU bar; each segment’s color is
fixed according to its position on the scale. Level
calibration may be set via dip switches to select one of
four different calibration levels.
The AMP1-DA/106 is ideally suited for use in VTR
bays, mobile production vehicles, teleconferencing
installations, multimedia systems, satellite link and
cable TV facilities, and on-air radio studios.
Features
Full fidelity audio monitoring in only 1RU
Two unbalanced AES/EBU digital inputs (selectable)
Two balanced analog inputs (1 stereo)
Balanced analog output of selected digital source

2-CHANNEL AUDIO MONITOR
AMP1-DA/106
Two ultra high resolution 106 Segment tri-color LED
bar graphs
Simultaneous VU (bar) and PPM (dot) bar graph
display ballistics
Custom variations of standard scales and/or color
masks available on request
Wide dynamic range
One dB midscale resolution
Powerful 98dB SPL at 2 feet (0.6m)
Premium quality drivers and power amplifiers
Extended frequency response and low distortion
Audible indication of phase/polarity problems
Headphone jack, mutes speakers
Blowout proof speakers
Quick and simple installation
Benefits
Thorough magnetic shielding allows placement next
to video monitors.
Custom variations of standard scales and/or color
masks are available on request for your convenience.
Audible indication of phase/polarity provides instant
information about signal problems.
Focused sound reduces adjacent bay crosstalk.
Extended frequency response and low distortion
provide high-quality reproduction
Two 106-segment, tri-color LED bar graphs provide
ultra high resolution.
Rear Panel
Physical Specifications
Dimensions (H x W x D) 1.75 x 19 x 12 inches (44.5x 483 x 298 mm)
Shipping weight 14 lbs. (6.4 kg)
Space requirements 1RU in a standard 19” rack
Supplied accessories AC external power unit/cord
Power connector Attached external power unit plugs into standard U.S. outlet. Alternate power
cables are available.
Power requirements Power to the unit is 24V DC, 3.0 A. The external power supply then connects to
mains power (100 to 240 VAC ± 10%, 50/60Hz.
Power consumption Approximately 30 W
AC mains input: 100-240VAC, 50-60 Hz

2-CHANNEL AUDIO MONITOR
AMP1-DA/106
Technical Specifications
Inputs 2 Analog (XLR, Male)
2 AES/EBU (BNC, Female)
Outputs 2 balanced analog output of selected input (XLR, male)
Additional rear panel controls Termination DIP switch
Gain/calibration DIP switch
Input level for maximum output
(volume full on) 0 dBv balanced
Input overload +26 dBv balanced
Peak acoustic output (2 feet) 98 dB SPL
Response, 6th octave 80 Hz - 16 kHz ± 7 dB
(-10 dB @ 50 Hz, 22 kHZ)
Power output
RMS each side (4 )
RMS bass (4 )
10 W transient / 5 W continuous
20 W transient / 10 W continuous
Distortion, electrical: Less than 0.15% at any level below limit threshold
Distortion, acoustic 8% or less at worst case frequencies above 180 Hz including cabinet resonance;
typically less than 2%
Hum and noise Better than -68 dB below full output
Magnetic shielding < 1 Gauss any adjacent surface
Power consumption (average max) 35 W
D to A gain calibration,
(dB = dBFS) +8 = -20, +4 = -20, +6 = -9, 0 = -18 (DIP selectable)
AES sampling rate 32 to 48 KHz, auto-select
D to A converter 24-bit low jitter
Converted analog out (S/N) >90 dB
Converted analog out (THD) < 0.008%
AES termination Removable (DIP select)
Level meter type 106-segment, tri-color LED bar graph
Bar graph quantity 2 each, horizontal
LED color Red • amber • green
Metering range 72 dB
Reference level select 0, +4, +6, or +8 dBv
Display mode select VU only • VU/PPM • PPM only
Peak hold select Manual, 3-sec, 10-sec, or off
PPM ballistics select Type I • Type II • DIN 4506 • SSRT
Scale select AES • Extended VU • Alternate AES • VU • BBC • NORDIC • DIN

2-CHANNEL AUDIO MONITOR
AMP1-DA/106
Contact
Wohler Technologies, Inc. Wohler Europe Wohler Asia
31055 Huntwood Avenue [phone] Lucky Commercial Center
Hayward, CA 94544 USA [phone] (fax) 103 Des Voeux Road West
+1 888 5 WOHLER (Toll Free) [e-mail] Sheung Wan, Hong Kong
[phone] www.wohler.com [phone]
[phone] (fax) [phone] (fax)
Part Number 830023, Revision A
Block Diagram