BUFEX - Unspecified Bogen - Free user manual and instructions

Product Type	Continuously Variable Speaker Attenuator, Buffer, and Speaker Expander
Power Supply	24V DC, 50 mA (1 CU)
Input Voltage Options	100V, 70V, 25V, and page port level selectable
Maximum Speaker Load	Up to 150 self-amplified speaker inputs
Output Impedance	8 Ω (transformer-isolated)
Attenuation Range	Continuously variable (maximum 12 dB attenuation in bypass trim)
Bypass Function	Override volume control via contact closure or open collector output
Bypass Trim Control	Adjusts volume in bypass mode (up to 12 dB attenuation)
Connections	Tip and Ring audio input; transformer-isolated output; 24V DC terminals (polarity insensitive)
Mounting	Single gang electrical box
Package Contents	(1) BUFEX unit, (2) faceplate screws, (1) manual
Warranty	2 years from date of sale to original purchaser
Manufacturer	Bogen Communications, Inc.
Country of Origin	USA (based on company address)

Frequently Asked Questions - BUFEX Bogen

What is the Bogen BUFEX?

The BUFEX is a continuously variable speaker attenuator, buffer, and speaker expander designed for self-amplified speakers. It allows remote volume control and system expansion.

How many speakers can the BUFEX drive?

It can drive up to 150 self-amplified speaker inputs.

What input voltage levels are supported?

The BUFEX supports 100V, 70V, 25V, and page port level selectable inputs.

How does the bypass function work?

The bypass function overrides the volume control knob setting when activated by a contact closure or open collector output. A bypass trim control adjusts the volume in bypass mode up to 12 dB attenuation.

What is the power requirement for the BUFEX?

It requires 24V DC at 50 mA (1 CU). Polarity reversal does not affect operation.

Can the BUFEX be used with existing 70V/100V systems?

Yes, it is designed to allow speaker system expansion for existing 100V, 70V, or 25V central amplifier systems.

What output impedance does the BUFEX provide?

The output is transformer-isolated with an impedance of 8 Ω.

How is the BUFEX mounted?

It fits into a single gang electrical box and is secured with the two provided faceplate screws.

What is included in the package?

The package contains one BUFEX unit, two faceplate screws, and an installation and use manual.

What is the warranty period for the BUFEX?

Bogen warrants the BUFEX to be free from defects in material or workmanship for two years from the date of sale to the original purchaser.

USER MANUAL BUFEX Bogen

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. 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 single 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 speakers for driving up to 150 speaker inputs.

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.

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.

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

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 volume setting of the BUFEX. See previous page for power and output wiring.

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.

Block Diagram

graph LR
    A["24V DC"] --> B["POLARITY RECTIFIER"]
    B --> C["24V"]
    D["INPUT"] --> E["T/R"]
    E --> F["100V 70V 25V T/R"]
    F --> G["DIVIDER NETWORK"]
    G --> H["VOL"]
    H --> I["AMP"]
    I --> J["XFMR"]
    J --> K["OUT"]
    L["BYPASS"] --> M["Q/C GND"]
    M --> N["10V"]
    N --> O["NOT"]
    O --> P["BYPASS TRIM"]
    P --> Q["NOT"]
    Q --> R["NOT"]
    R --> S["NOT"]
    S --> T["NOT"]
    T --> U["NOT"]
    U --> V["NOT"]
    V --> W["NOT"]
    W --> X["NOT"]
    X --> Y["NOT"]
    Y --> Z["NOT"]
    Z --> AA["NOT"]
    AA --> AB["NOT"]
    AB --> AC["NOT"]
    AC --> AD["NOT"]
    AD --> AE["NOT"]
    AE --> AF["NOT"]
    AF --> AG["NOT"]
    AG --> AH["NOT"]
    AH --> AI["NOT"]
    AI --> AJ["NOT"]
    AJ --> AK["NOT"]
    AK --> AL["NOT"]
    AL --> AM["NOT"]
    AM --> AN["NOT"]
    AN --> AO["NOT"]
    AO --> AP["NOT"]
    AP --> AQ["NOT"]
    AQ --> AR["NOT"]
    AR --> AS["NOT"]
    AS --> AT["NOT"]
    AT --> AU["NOT"]
    AU --> AV["NOT"]
    AV --> AW["NOT"]
    AW --> AX["NOT"]
    AX --> AY["NOT"]

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 parts and labor charges will be at the owner's expense. All returns require a Return Authorization number.

08/10/2004