Federal Signal's Model 300GC SelecTone Speaker Amplifier is designed to produce crisp, clear 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 internal 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. Model 300GC is UL Listed for indoor and outdoor use and has been designed, tested and approved for use in Type 3R applications.

Internal gain control allows output adjustment from 0dBa to a maximum of 110dBa at 10 feet. SelecTone Speaker Amplifiers 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 (both sold separately) is plugged into a single SelecTone Speaker Amplifier for stand-alone use or into a SelecTone Command Unit for plant-wide signaling.

For plant-wide signaling, a Connector Kit (sold separately) is installed into each SelecTone Speaker Amplifier and wired to a central controller. SelecTone Command Units and CommCenter Digital Message Centers broadcast tones, voice messages, melodies and live public address to an unlimited number of SelecTone Speaker Amplifiers.

Typical applications for SelecTone include emergency warning, plant evacuation, start and dismissal, public address, and process control signaling.


Voltage 24VDC
24VAC 50/60Hz
120VAC 50/60Hz
240VAC 50/60Hz
Mount Surface
Operating Current* 1.0 Amps at 24VDC
1.0 Amps at 24VAC
0.25 Amps at 120VAC
0.15 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 3R
Enclosure Rating IP54
Height 12.400 in
Width 7.900 in
Depth 8.500 in

Ordering Information

Model Types
Model Description UPC
300GC-024 SelecTone signal, 24VAC/DC, gain control 78297920011
300GC-120 SelecTone signal, 120VAC, gain control 78297920021
300GC-240 SelecTone signal, 240VAC, gain control 78297920031
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