Federal Signal’s Model 300GCX SelecTone® Amplified Speaker is designed to produce tones, digital voice messages and live public address in harsh environments with high ambient noise levels. 

The rugged speaker cone and projector are constructed of spun aluminum. The amplification circuitry, tone module, and gain control are contained in a housing constructed of die-cast aluminum. All surfaces are sealed with powder-coat paint. Dust- and moisture-proof gaskets provide protection from the elements.

SelecTone Amplified Speakers are used individually or as part of a plant-wide emergency notification system. The Model UTM Universal Tone Module, with 32 tones, or the TM33 Custom Tone Module is plugged into a single SelecTone Amplified Speaker for stand-alone use or into a SelecTone Command Unit for plant-wide signaling. 

For plant-wide signaling, a Connector Kit is installed into each SelecTone Amplified Speaker and wired to a central controller, SelecTone Command Unit or CommCenter® Digital Message Center. Command Units and CommCenters broadcast tones, voice messages, melodies and live public address to an unlimited number of SelecTone Amplified Speakers

Applications for SelecTone include emergency warning, evacuation, start/dismissal, public address, and process control signaling.


Voltage 24VDC
24VAC 50/60Hz
120VAC 50/60Hz
240VAC 50/60Hz
Mount Surface
T-Code** T6
Operating Current* 1.10 Amps at 24VDC
1.10 Amps at 24VAC
0.30 Amps at 120VAC
0.20 Amps at 240VAC
Operating Temperature Minimum -67 °F
Operating Temperature Maximum 150 °F
Decibel Output 110 at 10 Feet
120 at 1 Meter
Standby Current 0.15 Amps at 24VDC
0.35 Amps at 24VAC
0.15 Amps at 120VAC
0.06 Amps at 240VAC
Enclosure Rating Type 4X
Height 12.400 in
Width 7.900 in
Depth 8.500 in
Net Weight 5.50 lb
Shipping Weight 6.70 lb

Ordering Information

Model Types
Model Description UPC
300GCX-024 SelecTone signal, 24VAC/DC, hazardous location, gain control 78297920035
300GCX-120 SelecTone signal, 120VAC, hazardous location, gain control 78297920037
300GCX-240 SelecTone signal, 240VAC, hazardous location, gain control 78297920038
UTM Universal tone module 782979202172
TM33-SD Tone module, custom, Series D 78297922733
AM25CK Connector card, 25vrms 78297960085
AM70CK Connector card, 70vrms 78297960086
300CK 10 Vrms, 1 Vrms
T-300CK 2.7 Vrms, 1 Vrms
E-300CK 1 Vrms, 1 Vrms
Replacement Parts
Description Part Number UPC
PCBA, 24V, 15W K2001961B-05 782979229872
PCBA, 120/240V, 15W K2001961B-04 782979229865
Transformer, XFMR, 120VAC, 1.3 Amp, 15W K120857A 782979223573
XFMR, 240VAC, 1.8A, 30W K120858A 782979219323
Amplifier assembly, 15 watt, for Series D K2005502A-04 782979227151
Speaker assembly, 15 watt, 4X, grey K8593082A 782979206088
Voice coil, Series C K8593035A 782979204848
Gasket K288A043 782979390244
Housing, SelecTone, gray K8473021A 782979235743
Cover, SelecTone, gray K8473022A 782979299905