4
8 x 2A Dual Stereo Audio Switcher Installation Manual
Broadcast Tools, Inc.
The
8 x 2A Dual Stereo audio switcher
is simple to install. The signal inputs, outputs are
connected via clamp style wire captive terminal strips located at the rear of the unit.
Connections to the clamp style wire captive terminal strip should be made using
22 AWG or smaller solid or stranded wire. Strip off approximately 3/16" from the
connection end of the wire, push the white lever just to the rear of the terminal strip
connections towards the inside-rear of the unit. While continuing to push the lever,
insert the bare wire end into the open orange hole at the desired connection point.
Releasing pressure on the white lever will then clamp the wire into its connection.
Connections may be made to the + and -
inputs
for balanced operation, or to the + input and
grounding the - side for unbalanced
input
operation. Connections can be made to the + and -
outputs
for balanced operation, or to the + output and ground for unbalanced
output
operation. Monaural output # 1 is balanced, while monaural output # 2 is unbalanced. In no
case should either the + or -
outputs
be connected to ground.
The input channels are numbered from 1 through 8 on the rear panel and correspond to the 8
switches on the front panel from left to right. (The left most switch on the front panel is
channel 1).
The input impedance is high, 600
Ω
termination may be done external to the
8 x 2A Dual
Stereo audio switcher
.
SETUP
Input and Output Levels
Once the input and output connections have been made, the input levels can be set.
The switcher is factory set for zero gain. Recommended input levels would be in the range of
-10 dBm to +4 dBm. The inputs and outputs can both add an additional 15 dB of gain from
the factory settings. Should input levels need to be changed, they are accessible from the rear
panel. Each stereo input is labeled and has one input adjustment. Similarly, the output
channel and input dim trimmers are accessed with the top cover removed. Adjustment of
dimming is between 0 (NO DIMMING) and - 10 db. The dim jumper must be in the dim
(D)
position for this to function. Please note that dimming is only available on output channel one
(1). If output two is to be used, one must move the DIM jumper to the position labeled (2)
two and adjust the DIM trimmer fully clockwise, as viewed from the front of the unit.
