User Manual

ManualsBrandsBogen ManualsAudioBuffer Expander

BUFEX

Attenuator, Buffer, and Speaker Expander

for Self-Amplified Speakers

Features

• Can drive up to 150 self-amplified speaker inputs

• 100V, 70V, 25V, and page port level selectable inputs

• Bypass trim control for emergency paging

• Continuously variable attenuator

54-2123-01B

Specifications subject to change without notice.

0511

Description

The BUFEX is a continuously variable speaker attenuator that allows the volume of a network of

speakers to be remotely controlled.The BUFEX provides output buffering for up to 150 self-ampli-

fied speakers. It allows speaker system expansion for existing 100V, 70V, or 25V central amplifier

systems.

The unit includes a bypass function for overriding the volume control knob setting when

activated by a contact closure or open collector output. A bypass trim control adjusts the

volume when in bypass mode with a maximum of 12 dB of attenuation.The BUFEX fits into a sin-

gle gang electrical box.

Installation

1. Make all the necessary electrical connections and jumper selection before installing unit.

2. Mount the unit to the electrical box using the 2 faceplate screws provided.

Package Contents

(1) Installation and Use Manual

(1) BUFEX Unit

(2) Faceplate Screws

Summary of content (4 pages)

PAGE 1
BUFEX Attenuator, Buffer, and Speaker Expander for Self-Amplified Speakers Features • Can drive up to 150 self-amplified speaker inputs • 100V, 70V, 25V, and page port level selectable inputs • Bypass trim control for emergency paging • Continuously variable attenuator Description The BUFEX is a continuously variable speaker attenuator that allows the volume of a network of speakers to be remotely controlled.The BUFEX provides output buffering for up to 150 self-amplified speakers.
PAGE 2
Typical Connections Buffered branch with BUFEX volume control (24V supply for this branch not shown) - + + R R T T Output Terminals The Tip (T) and Ring (R) connections are transformer-isolated audio outputs with an output impedance of 8Ω. Connect these to the audio inputs of the amplified speakers for driving up to 150 speaker inputs.
PAGE 3
Bypass Connection Examples In the example below the AUX contacts of the UTI1 are programmed to close when the UTI1’s Override (Emergency) input becomes active.The AUX contacts trigger the Bypass feature of the BUFEX allowing a full volume page to be heard regardless of the voume setting of the BUFEX. See previous page for power and output wiring. UTI1 Bypass Trim Control The bypass trim control sets the volume when the unit bypasses the volume control knob (maximum attenuation of 12 dB).
PAGE 4
Block Diagram 24V DC POLARITY RECTIFIER 24V 24V VOL INPUT 100V T 70V T R 25V R T/R AMP DIVIDER NETWORK XFMR OUT 10V BYPASS BYPASS TRIM O/C GND Limited Warranty The BUFEX is warranted to be free from defects in material or workmanship for two (2) years from the date of sale to the original purchaser.