Bogen BUFEX Operation Manual

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

© 2004 Bogen Communications, Inc.

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-ampli­fied 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

Typical Connections

Buffered branch with BUFEX
volume control (24V supply for
this branch not shown)

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 speak-

ers for driving up to 150

speaker inputs.

100V J1

70V J2
25V J3

T&R J4

INPUT

SIGNAL

TYPE

Input Terminals

The input terminals can receive
dry audio (Tip and Ring), as

well as 100V, 70V, and 25V

speaker signals depending on
the input voltage type jumper
setting.

Existing branch that needs buffer­ing or audio to area requiring
local volume control (24V supply
for this branch not shown).

24V DC Terminals

The BUFEX power consumption is

1CU (50 mA) @ 24V DC.Terminals

are marked "+" and "-", but will func­tion properly even if polarity connec­tions are reversed.

24V

Power

Supply

-

+

-

+

R

T

R

T

T

R

+

-

T

R

+

-