Specifications

RM1 Rack-Mounting Kit
The Crown RM1 is a single-unit rack-mounting kit. It is designed to
be used with Commercial Audio models 135MA and 160MA mixer-
amplifiers.
IST Isolation Transformer
The Crown IST is a 600-ohm to 600-ohm isolation transformer used
for telephone connectivity. It is designed to be used with Commercial
Audio models 135MA and 160MA mixer-amplifiers.
RM2 Rack-Mounting Kit
The Crown RM2 is a dual-unit rack-mounting kit. It is designed to
be used with Commercial Audio models 135MA and 160MA mixer-
amplifiers.
S-COVER Security Cover Bulk Pack
The Crown S-COVER is a 10-pack of security covers. It is designed
to be used with Commercial Audio models 135MA and 160MA mixer-
amplifiers.
COMMERCIAL AUDIO ACCESSORIES
ACCESSORIES
XFMR-4 & XFMR-8
` FEATURES
• Transformers provide four and eight channels
of impedance matching for Constant-Voltage
operation
• Provides 70V and 100V output when used only with
Com-Tech DriveCore (CT 475, CT 875, CT 4150 and
CT 8150)
• Allows amplifiers without direct Constant-Voltage
capability to be easily integrated into distributed
systems
• “Jumper” cables are provided to easily incorporate
the XFMR unit with a Com-Tech DriveCore amplifier
Constant-Voltage Transformers
The Crown XFMR-4 and XFMR-8 are rack-mountable
transformers to provide impedance matching between
amplifier outputs and “constant voltage” loudspeakers.
This unit allows amplifiers without direct 70V or 100V
output capability to drive distributed speaker systems
designed to operate at those voltages.
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Harman Pro Group | 2012
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