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
+
-
Bypass Connection Examples
Bypass Terminals
The bypass terminals override the volume control knob, thereby allowing a full
volume page to be heard in the area
even if the front-mounted volume control knob is set to maximum attenuation.
Bypass can be triggered via a contact
closure or an open collector output.
Bypass Trim Control
The bypass trim control
sets the volume when the
unit bypasses the volume
control knob (maximum
attenuation of 12 dB).
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 fea-
ture 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
PCM-ZPM
PCM2000
In this configuration the Bypass feature
activates when the zone is being paged,
but allows volume control when the
zone is inactive and background music
is playing. See previous page for power
and output connections.
50 Spring Street, Ramsey, NJ 07446, U.S.A.
201-934-8500; Fax: 201-934-9832
www.bogen.com
Block Diagram
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. Any part of the product covered by this warranty that, with normal installation and use,
becomes defective will be repaired or replaced by Bogen, at our option, provided the product is shipped insured
and prepaid to: Bogen Factory Service Department, 50 Spring Street, Ramsey, NJ 07446, USA. The product will
be returned to you freight prepaid. This warranty does not extend to any of our products that have been subjected
to abuse, misuse, improper storage, neglect, accident, improper installation or have been modified or repaired or
altered in any manner whatsoever, or where the serial number or date code has been removed or defaced.
THE FOREGOING LIMITED WARRANTY IS BOGEN’S SOLE AND EXCLUSIVE WARRANTY AND THE PURCHASER’S SOLE AND EXCLUSIVE REMEDY. BOGEN MAKES NO OTHER WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED TO THE MAXIMUM EXTENT
ALLOWABLE BY LAW. Bogen's liability arising out of the manufacture, sale or supplying of products or their use
or disposition, whether based upon warranty, contract, tort or otherwise, shall be limited to the price of the product.
In no event shall Bogen be liable for special, incidental or consequential damages (including, but not limited to, loss
of profits, loss of data or loss of use damages) arising out of the manufacture, sale or supplying of products, even
if Bogen has been advised of the possibility of such damages or losses. Some States do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This
warranty gives you specific legal rights, and you may also have other rights which vary from State to State.
Products that are out of warranty will also be repaired by the Bogen Factory Service Department -- same address
as above or call 201-934-8500. The parts and labor involved in these repairs are warranted for 90 days when
repaired by the Bogen Factory Service Department. All shipping charges in addition to p arts and labor charges will
be at the owner's expense. All returns require a Return Authorization number.
08/10/2004
24V DC
POLARITY
RECTIFIER
24V
AMP
24V
XFMR
INPUT
T
R
BYPASS
O/C
GND
VOL
100V
70V
25V
T/R
DIVIDER
NETWORK
10V
BYPASS
TRIM
T
R
OUT
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