Federal Signal AM50-70B - AudioMaster Public Address Speaker, 2W, 70 Vrms, Re-Entrant Speaker, UL Fire, Beige
Federal Signal

AM50-70B

Alternate Item Number: am50-audiomaster

UPC: 782979600800


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Overview

The Federal Signal AudioMaster AM50-70B (SKU: AM50-70B) is a 2-watt, 70 Vrms re-entrant public address speaker designed for clear voice communication in industrial, commercial, and institutional environments. This transformer-coupled speaker features a folded horn design for uniform sound dispersion, reducing dead zones and ensuring consistent intelligibility across large or noisy areas. The UL fire-rated construction meets stringent safety standards for fire protective signaling use, making it ideal for public buildings, manufacturing plants, schools, hospitals, and transportation hubs. With a compact 5.5" square form factor and neutral beige finish, the AM50-70B blends seamlessly into various architectural styles while maintaining durability. The re-entrant mounting system simplifies installation, adapting to standard four-inch square or weatherproof back boxes for flexible mounting options. Wiring terminals with strain relief ensure secure connections for inbound and outbound speaker wiring.
  • 2-watt power output with 70 Vrms voltage rating for distributed audio systems
  • Re-entrant horn design ensures uniform sound dispersion and reduces dead zones
  • UL fire-rated construction meets stringent safety standards for fire protective signaling
  • Compact 5.5" square form factor with neutral beige finish for versatile installation
  • Transformer-coupled with power taps (2W, 1W, 1/2W, 1/4W) for flexible system integration
  • Operating temperature range: -40°F to 151°F (-40°C to 66°C)
  • Includes wiring terminals with strain relief for secure connections

Specifications

-40 to 151
DEG F
140 to 10,000
HZ
25/70
Vrms
5.5 H x 5.5 W x 2.5 D
IN
87
dBa
97
dBa
Application
Indoor/Outdoor
Audio Input
25/70 Vrms
Audio Specifications
70 VRMS
Brand Name
Federal Signal
Color
Beige
dBa at 10ft
87 dBa
dBa at 1M
97 dBa
Dimensions
5.5 H x 5.5 W x 2.5 D IN
Enclosure
Type 3R With Model WB Back Box
Loudness
87 DB
Mounting
Wall
Mounting Type
Re-Entrant
Operating Frequency
140 to 10,000 HZ
Operating Temperature
-40 to 151 DEG F
Output Level
2 WTT
Series
AudioMaster
Special Features
Includes Trim Ring For 4-Inch Square Back Box
Standard
CSFM,UL Fire
Standard
UL Fire Listed/CSFM Approved
Sub Brand
AudioMaster
Type
Public Address Re-Entrant Speaker
Voltage Rating
70 Vrms
Package Dimensions (L x W x H)
5.75 IN x 5.75 IN x 5 IN
Package Dimensions (L x W x H)
14.605 cm x 14.605 cm x 12.7 cm
Package Weight (Imperial)
1.750 L
Package Weight (Metric)
0.794 kg
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Frequently Asked Questions

Can the AM50-70B speaker be used outdoors?

Yes, the AM50 speaker is suitable for indoor/outdoor use.

What is the enclosure rating for the AM50-70B?

The AM50 speaker has a Type 3R enclosure rating when used with the WB weatherproof back box.

Is the AM50-70B speaker UL Fire Listed?

Yes, the AM50 speaker is UL Fire Listed.

Is the AM50-70B speaker CSFM Approved?

Yes, the AM50 speaker is CSFM Approved.

What is the AM50-70B speaker's power rating?

The AM50 is a 2-watt public address re-entrant speaker.

What is the operating voltage for the AM50-70B?

The AM50 speaker operates on 25 or 70 Vrms.

What are the mounting options for the AM50-70B?

The AM50 speaker offers several mounting options and comes pre-assembled.

How to Install the AM50 Adjustable Power Loudspeakers

This guide provides step-by-step instructions for safely installing and configuring the AM50 adjustable power loudspeakers.

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, Terminal connectors

  1. Select the mounting location

    Choose a suitable location for the loudspeaker, ensuring it complies with local codes and is positioned correctly with respect to conduit entryways.

  2. Mount the loudspeaker

    Use the supplied #8-32 x 3" mounting screws to secure the loudspeaker to a standard 4 x 4 electrical box, ensuring it is firmly attached.

  3. Make electrical connections

    Strip 1/4" of insulation from the wiring leads and connect the appropriate wires to the terminals labeled 'S+' and 'S-'. Tighten the screws to secure the connections.

  4. Adjust power settings

    Set the desired wattage by removing the mini jumper and placing it on the designated pins for the selected power setting (1/4, 1/2, 1, or 2 watts). Ensure the jumper is fully seated.

  5. Test the loudspeaker

    After installation, power on the system and test the loudspeaker to ensure it operates correctly. If the volume is too low, adjust the jumper to a higher wattage setting and retest.

  6. Establish a testing routine

    Create a schedule for periodic testing of the loudspeaker in accordance with NFPA 72 and local fire codes to ensure ongoing functionality.

Frequently Asked Questions about Federal Signal

What certifications and standards do Federal Signal products comply with?

Federal Signal products are certified across multiple international standards, including UL (Underwriters Laboratories) in the USA, CSA (Canadian Standards Association), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia and New Zealand). Their products meet rigorous safety and performance standards for industrial environments, with specific compliance in electrical equipment enclosures, functional safety, and environmental protection ratings.

What is Federal Signal's warranty policy?

Federal Signal offers a comprehensive limited warranty covering most products for 1-5 years from the date of delivery, with specific terms varying by product category. Mechanical sirens, beacons, speakers, and sounders typically receive 5-year parts and labor coverage, while electronic sirens and controllers generally have 2-year warranties. All warranties require return to the factory for service, and on-site services are not included. Certain components like domes, lenses, lamps, and batteries are specifically excluded from warranty coverage.

What industries and applications are Federal Signal products used for?

Federal Signal products are used across multiple critical industrial and municipal sectors for notification, communication, and safety systems. Their product lines cover essential applications including fire alarm systems, public address and telephony, outdoor warning systems, visual and audible signals, and emergency communication networks. Key industries served include manufacturing, municipal emergency services, industrial facilities, and infrastructure environments where clear, reliable communication and safety signaling are paramount.

What technical support does Federal Signal offer?

Federal Signal offers comprehensive technical support through their dedicated [email protected] email and direct phone line at +1 708.534.4756. Their support covers a wide range of notification and communication solutions, including technical assistance for products in public address, telephony, fire alarm, visual and audible signals, outdoor warning systems, and intercoms.

What are the main product lines offered by Federal Signal?

Federal Signal offers comprehensive notification and communication solutions across multiple product lines, including Visual Signals, Audible Signals, Telephony, Intercoms, Fire Alarm, Outdoor Warning Systems, Public Address, and Initiating Systems. Their product range is designed to provide clear communications and critical process notifications that enhance safety and compliance in industrial and public environments.

What are the key features of Federal Signal products?

Federal Signal products are comprehensive notification solutions designed to enhance safety and communication across industrial environments. Their key features include visual and audible signals, fire alarm systems, outdoor warning systems, public address capabilities, telephony, and intercoms. These products provide critical process notifications, ensure safety compliance, and offer advanced technologies like secure encrypted communication, cloud-based control systems, and customizable emergency response interfaces.

What environmental ratings do Federal Signal products have?

Federal Signal products offer robust environmental ratings across multiple standards, including UL 508A, CSA, NEMA, and IEC 60529. Their enclosures are rated for Type 1, 2, 3, 4, 4X, 12, and 13 environments, with IP66 protection, and can operate in temperatures ranging from -40°F to 266°F. These ratings ensure superior protection against dust, water, corrosion, and extreme conditions for indoor and outdoor industrial applications.

What accessories are available for Federal Signal products?

Federal Signal offers multiple accessories for their signaling products, including coupling kits, cable entry adapters, indicator rings, legend plates, and mounting brackets. Key accessories include E-Box endcap kits with M20 and M25 openings, U-Brackets for dual configurations, and color-coded indicator rings in black, blue, green, magenta, red, and yellow. Additional options like adapters for NPT connections and specialized mounting hardware are also available for their Global Series signaling platforms.

What communication protocols do Federal Signal products support?

Federal Signal supports multiple industrial communication protocols including PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, and Modbus RTU. These protocols enable flexible network integration across various industrial automation environments, supporting both traditional fieldbuses and modern Ethernet-based communication standards.

How are Federal Signal products typically installed?

Federal Signal products are typically installed using professional mounting configurations that include wall brackets, base stations, and specialized mounting hardware. Depending on the specific product line—such as outdoor warning systems, visual signals, or audible signals—installation involves precise mounting options like wall-mount antenna brackets, base station radio packages, and modular component assemblies. Each product configuration includes specific mounting accessories like endcaps, adapters, and terminal blocks to ensure secure and compliant installation in industrial and safety-critical environments.