CAUTION: Before you begin, make sure that the amplifier
is disconnected from the power source and all level con-
trols are turned completely down (counter-clockwise).
1. If you need to mount the transformer module to rack, use
a standard 19-inch (48.3-cm) equipment rack (EIA RS-
310B) . You can have the following options according to
your application:
• Rack mounting the transformer module with a CSA-
2120 amplifier (See Figure A)
• Rack mounting single unit (See Figure B)
• Wall mounting (See Figure C)
2. Connect the input of the transformer module to the output
of the CSA-2120 amplifier with the shipped 4-pin cable.
3. Determine the proper transformer module tap to use,
based on the desired constant-voltage of your system.
Note: The CST-2120 transformer module is designed to work
with the CSA-2120 amplifer in a public address system. The
rack mounting kit is not included with this product, and you
can find it in the CSA-2120 package. If you fail to find the rack
mounting kit, please consult your local dealer.
Installation
Specification
The rack-mountable JBL Commercial
®
CST-2120 transformer
module provides impedance and voltage matching from the
CSA-2120 amplifier (with 4 ohms or 8 ohms outputs) to drive
70V and 100V distributed speakers systems.
This unit allows the CSA-2120 amplifier without direct 70V or
100V output capability to drive distributed speaker systems
designed to operate at those voltages.
Introduction
• Providing two channels of impedance matching and volt-
age matching for “Constant Voltage” operation.
• Providing 70V and 100V output when used with CSA-2120
amplifiers
• Allowing CSA-2120 amplifiers to be easily integrated into
distributed systems
• Detachable Phoenix-style input and output connectors
A
B
C
System
Physical
Max Input Power: 125W/CH
Dimensions (W x H x D): 8.2” X 1.7” X 7” (209 mm x 44 mm
x 178 mm)
Max. Input Voltage: 32Vrms (AMP rated at 125W into 8 ohms)
Net Weight: 2.1 Kg (4.6 lbs)
Insertion Loss: Less than 1dB
Gross Weight: 2.4 Kg (5.3 lbs)
Frequency Response: +0/-1 dB (at 70 V tap/40 ohms
load or 100 V tap/80 ohms load, 1 watt
output, 70Hz – 15kHz)
