Data Sheet

Specifications subject to change without notice.
© 2005 Bogen Communications, Inc.
54-8023-15B 1201
Buffer-Expander
Volume Control
Model BUFEX
The BUFEX is a continuously variable speaker attenuator that can remotely control the volume of a network of
speakers. The BUFEX also provides output buffering for up to 150 self-amplified speaker inputs and allows
speaker system expansion of existing 100V, 70V, or 25V central amplifier systems. The BUFEX includes a bypass
function that can override the volume control knob setting when activated by a contact closure or open
collector output. This allows emergency announcements to be heard through all speakers in a system even if the
volume control knob setting is set low or off. A PCB-mounted bypass trim control adjusts the volume when in
bypass mode with a maximum of 12 dB of attenuation. The BUFEX fits into a single gang electrical box.
• Continuously variable attenuator
• Drive up to 150 self-amplified speaker inputs
• 100V, 70V, 25V, and page port level selectable input
• Bypass trim control for emergency paging (12 dB of
preset control over level of bypass announcements)
• Mounts in a single gang electrical box
• Rugged and attractive stainless steel plate with
engraved lettering
• Easy and secure terminal strip connections
• Two-Year Warranty
Features
Description
Architect
& Engineer
Specifications
The Level Controller shall be a continuously variable
speaker attenuator that can remotely control the
volume of a network of speakers, Bogen Model
BUFEX. It shall provide output buffering for up to 150
self-amplified speaker inputs and allow speaker system
expansion of existing 100V, 70V, or 25V central ampli-
fier systems.
The BUFEX shall include a bypass function for
overriding the volume control knob setting when
activated by a contact closure or open collector
output. A PCB-mounted bypass trim control shall adjust
the volume when in bypass mode with a maximum of
12 dB of attenuation.
The BUFEX power consumption shall be 1 CU (50 mA)
@ 24V DC.
The Tip (T) and Ring (R) connections shall be audio
outputs with an output impedance of 8 ohms.
The BUFEX shall have a rugged and attractive
stainless steel plate with engraved lettering.
The BUFEX shall measure 2-7/8" W x 4-5/8" H x
2-1/2" D and fit into a single gang electrical box. The
BUFEX shall weigh 3 ounces.
Technical
Specifications
Bypass Trip Current: 0.8 mA
Speaker Drive Capacity: 150 Self-Amplified Speakers
Input Compatibility: 100V, 70V, and 25V
Dimensions: 2-7/8" W x 4-5/8" H x 2-1/2" D
Product Weight: 3 oz.
Supply Voltage: 24V DC
Current Consumption: 1 CU (50 mA)
Output Impedance: 8 ohms
Volume Control Range: 0 to -50 dB
Bypass Voltage: 10V