Federal Signal’s AudioMaster® Model AM50 is a compact, two watt, transformer coupled speaker for use in emergency notification 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.
This speaker is supplied with wiring terminals and strain relief for inbound and outbound speaker wiring.
Model 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 UL Listed for “Fire Protective Signaling Use” and California State Fire Marshall approved.


Mount Wall
Optional Weatherproof Back Box (Model WB)
Optional Flush Mount Box (Model FBL)
Power Handling 2 Watt
Power Taps 2, 1, 1/2, 1/4
Frequency Response 140Hz - 10KHz
Decibel Output 87 dBa @ 10 Feet (97 dBa @ 1 Meter)
Operating Temperature Minimum -40 °F
Operating Temperature Maximum 151 °F
Enclosure Rating Type 3R when used with Weatherproof Backbox
Net Weight 1.40 lb
Shipping Weight 1.75 lb
Height 5.500 in
Width 5.500 in
Depth 2.520 in

Ordering Information

Model Types
Model Description UPC
AM50-25B Speaker, 4", 25Vrms, transformer coupled, UL, beige 782979600756
AM50-70B Speaker, 4", 70Vrms, transformer coupled, UL, beige 782979600800
AM50-25R Speaker, 4", 25Vrms, transformer coupled, UL, red 782979216698
Product # Description UPC
WB Weatherproof back box, gray 782979224709
FBL Deep wall box for flush mount, 50GC 782979223504
FG Grille, flush mount 782979223603