© 2010 Wohler Technologies, Inc. All rights reserved.
9
AMPx-SDA User Guide
Front Panel Controls
•
Speakers
:
The internal speaker system is comprised of two mid-
range tweeter speakers (left and right) and woofer speakers. The
AMP1-SDA has two woofers wired in series and the AMP2-SDA
has one larger woofer. The two side channel speakers reproduce, in
stereo, only the mid and high frequencies. Please note that the
woofer speaker (center) is not a dedicated center nor LFE speaker.
•
Power Indication LED
: This LED glows green to indicate the
AMPx-SDA is connected to mains power and an operation voltage
is present.
•
Audio Level Meter LED Bar Graphs
: Audio levels for the selected
source (right and left) are visually displayed via these two high-
resolution, tricolor LED bargraph meters. Dynamic range for these
meters is 65 dB and they are able to simultaneously display signal
levels using both PPM and VU standards. Alternate display modes
are user selectable via a DIP switch accessible through the top cover
of the unit. Contact the factory for additional information
concerning meter scales and ballistics.
•
Volume
: This controls the loudness of the audio reproduced by the
internal speakers or connected headphone. Clock-wise rotation of
this control increases the loudness of the monitored audio.
•
Headphones
: Select the headphone audio sources as you would for
the internal speakers. When you plug in headphones, the internal or
external speakers will mute. This jack accepts a standard 1/4”
phone type stereo plug.
•
Analog/Digital Source Select
:
This two position toggle switch allows
the operator to choose between two primary input sources;
Analog
or
Digital
. When this toggle switch is set to
Analog
, the unit will monitor
the signals as input on the two rear panel
Analog In
XLR connectors.
When this toggle switch is set to
Digital
, the unit will monitor one of two
types of digital signal sources as chosen by the
Digital Source Select
switch.
•
Bar Graph Brightness
: This control is recessed into the front panel
and can be accessed using a small screwdriver. Turning it clockwise
will increase the relative brightness of the bargraph display LED
segments. Adjusting this one control will simultaneously affect the
brightness of both bargraph displays on the front panel.
•
Phase Indication LEDs
: These three LEDs offer instant verification
of phase (polarity) conditions in the pair of channels selected for
monitoring in
the left/right channel speakers. There are three LEDs; the