Bogen TPU15A Telephone Paging Amplifier (15-Watt)

Product Overview

The Bogen TPU15A is a 15-watt telephone paging amplifier built for commercial installations where paging calls must override background music automatically and audio levels need to remain consistent regardless of telephone line signal variation. Supporting 25V, 70V, and 8-ohm speaker outputs, it accommodates the distributed speaker wiring configurations typical of commercial telephone paging systems in offices, warehouses, and institutional facilities. An integral automatic level control (ALC) circuit compensates for the variable input levels inherent to telephone line paging — a critical capability that prevents paging audio from being too loud or too quiet depending on the call source. The TPU15A is rated to UL Standard 60065 for the U.S. and Canada, and installs in either wall or rack configurations.

Product Description

Telephone paging amplifiers face a specific challenge that general-purpose amplifiers do not: the signal level arriving from a telephone line varies significantly depending on the distance from the phone to the central office, the trunk type, and the specific handset. The TPU15A's automatic level control circuit continuously monitors the incoming telephone signal and adjusts amplifier gain to maintain a consistent output level, ensuring paging audio is intelligible and at an appropriate volume throughout the day regardless of which phone or line is used to initiate the page.

Background music muting is handled automatically by a signal-activated circuit — when a telephone page is initiated, the TPU15A mutes the background music input without requiring manual switches or external relays. When the page ends, background music resumes automatically. This behavior is essential in commercial spaces where background music runs continuously and paging must interrupt it clearly without staff intervention. The built-in night ringer activates via external contact closure, enabling after-hours ring notification through the paging speaker system. Individual front-panel controls for tone, page volume, background music volume, and night ringer volume give the installer precise adjustment capability using only a screwdriver. A low-cut switch reduces low-frequency noise from telephone lines, an LED overload indicator signals when the amplifier is being driven beyond its rated capacity, and a built-in circuit breaker provides overcurrent protection. The black finish is appropriate for rack-mount installations in equipment rooms and server closets, and the amplifier's wall-mount option suits installations in utility spaces where rack infrastructure is not available.

Key Features

• Automatic Level Control (ALC) — Continuously adjusts amplifier gain to compensate for varying telephone line input levels, maintaining consistent paging volume across all call sources.
• Signal-Activated Music Muting — Automatically mutes background music when a page is initiated and restores it when paging ends, with no manual switches or external relays required.
• Multiple Output Configurations — Supports 25V, 70V, and 8-ohm speaker outputs to accommodate standard commercial distributed speaker wiring systems.
• Built-In Night Ringer — Activates via external contact closure for after-hours ring notification through the paging speaker system.
• Simple Screwdriver Installation — All connections and adjustments are accessible with a standard screwdriver; no special tools required.
• Dual Input Support — Accepts 600-ohm balanced telephone line and background music inputs on separate, independently controlled channels.
• Independent Volume Controls — Separate controls for page volume, background music volume, tone, and night ringer volume for precise system tuning.
• Lo-Cut Switch — Reduces low-frequency noise from telephone lines to improve paging audio clarity.
• LED Overload Indicator — Visual alert when the amplifier is being driven beyond its rated output, allowing quick diagnosis during commissioning or operation.
• Circuit Breaker Protection — Integral circuit breaker provides overcurrent protection without requiring fuse replacement.
• Wall or Rack Mount — Flexible installation options for equipment rooms, server closets, and utility spaces.
• UL 60065 Listed — Rated to UL Standard 60065 for the U.S. and Canada for compliant commercial installations.

Typical Applications

• Commercial offices with telephone paging and background music systems
• Warehouses and distribution facilities requiring overhead paging
• Government buildings and institutional facilities with telephone paging infrastructure
• Commercial meeting spaces and multi-purpose rooms with paging integration
• Training facilities with distributed speaker systems
• Retail environments with background music and announcement capability

Technical Specifications

Frequently Asked Questions

Why is automatic level control important for a telephone paging amplifier?

Telephone line signal levels vary depending on the phone, line distance, and trunk type. Without ALC, paging volume would be inconsistent — too loud from some phones, too quiet from others. The TPU15A's integral ALC circuit compensates for these variations automatically, ensuring consistent paging volume regardless of the call source.

Does the TPU15A require external relays or switches to mute background music during a page?

No. The music muting circuit is signal-activated and built into the amplifier. When a telephone page is initiated, the TPU15A detects the incoming signal and mutes the background music input automatically. No external relays, switches, or additional wiring are required.

What speaker systems is the TPU15A compatible with?

The TPU15A supports 25V, 70V, and 8-ohm speaker outputs. The 70V output is the most common choice for commercial distributed speaker systems. The 8-ohm output can drive individual speakers directly in smaller installations.

Can the TPU15A be rack-mounted?

Yes. The TPU15A supports both wall and rack mounting, making it suitable for equipment rooms, server closets, and other infrastructure spaces where a rack is available. Consult Bogen or your dealer for rack-mount hardware specifics.

What triggers the night ringer function?

The night ringer activates via external contact closure, typically connected to a telephone system's night service relay or a building management system output. When activated, ring audio is played through the connected paging speakers.

Is the TPU15A UL listed?

Yes. The TPU15A is listed to UL Standard 60065 for both the U.S. and Canada, meeting the safety requirements for commercial audio equipment installations.

What is the purpose of the lo-cut switch?

The lo-cut switch reduces low-frequency content from the telephone line input, which can include hum and noise artifacts. Engaging it improves paging audio clarity in installations where low-frequency noise is present on the telephone line.