Federal Signal

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Public Address

AM50 AudioMaster® Public Address 2 Watt Re-Entrant Speaker

  • Transformer coupled
  • 25 or 70Vrms
  • 2 watt
  • Several mounting options
  • Re-entrant horn design
  • Pre-assembled
  • Type 3R with WB box
  • UL Fire Listed
  • UL 1480 and CSFM Approved

The Federal Signal Model AM50 is a compact, 2 watt, transformer coupled speaker for use in public address or paging applications. The unique design of this four-inch square speaker centers around the short, folded, re-entrant horn that is interposed between the diaphragm and the surrounding space. The beige, thermoplastic, flame-retardant housing provides greater efficiency and frequency response while blending easily into commercial and industrial spaces.

Power handling for the AM50 is 2 watts with transformer taps of 2, 1, 1/2, and 1/4. A moveable contact clip is used to select the power output. The AM50 comes factory preset in the 1/4 watt position. Two models of the speaker are available for use in 25Vrms and 70Vrms distributed systems. This speaker is supplied with wiring terminals and strain relief for inbound and outbound speaker wiring.

The AM50 is designed primarily for wall mounting and includes a trim ring for adapting to any standard four-inch square or weatherproof back box. This speaker is Underwriters Laboratories Listed for "Fire Protective Signaling Use" and California State Fire Marshall Approved.


Part # Description Shipping Weight Net Weight  
AM50-25B Speaker, 4", transformer coupled, beige 1.75 lbs. 1.4 lbs. Add to Quote >
AM50-70B Speaker, 4", transformer coupled, beige 1.75 lbs. 1.4 lbs. Add to Quote >


Part # Description Ship Weight  
WB Box, weatherproof, gray 1.15 Add to Quote >
FBL Deep wall box for flush mount 1.8 Add to Quote >
FG Grille, flush mount 0.75 Add to Quote >

Replacement Parts

Description Part #  


Listed By Underwriter's Laboratory (ULus)
Speakers and amplifiers for fire protective signalling systems UUMW_S2635.pdf
Listed By California State Fire Marshall (CSFM)
Speakers 7320_0811_002.pdf





Optional Weatherproof Backbox (Model WB)

Optional 4" Electrical Box (Model NBL)

Optional Flush Mount Box (Model FBL)

Power Handling 2 Watt



Power Taps





Beam Width 58º
Frequency Response 140Hz - 10KHz
Decibel Output

87 at 10 Feet

97 at 1 Meter

Operating Temperature Min. -40 F
Operating Temperature Max. 151 F
Enclosure Rating Type 3R when used with Weatherproof Backbox
Height 5.5 IN
Width 5.5 IN
Depth 2.5 IN
Federal Signal distributed by Gross Automation - Brookfield, WI - Phone: (262) 252-1600 - Fax: (262) 252-1616
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