Model 50GCB SelecTone® Amplified Speaker is designed to produce crisp, clear tones, digital voice messages and live public address. Designed to mount in ceilings, the 50GCB features a seven-inch white grille over a 4" speaker amplifier.
SelecTone Amplified Speakers are used individually or as part of a plant-wide emergency notification system. Model UTM Universal Tone Module with 32 tones, or TM33-SD 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, a SelecTone Command Unit or a CommCenter® Digital Message Center. SelecTone Command Units and CommCenter Digital Message Centers can broadcast tones, voice messages, melodies and live public address to an unlimited number of SelecTone Amplified Speakers.
Model 50GCB is designed for areas without high ambient noise levels, such as offices, hallways and receptions areas. The baffle allows the four-inch speaker to be installed easily in any suspended ceiling plenum with a Model R4NB back box.The white grille of the 50GCB is attractive in most decors.
Emergency signaling or paging are common applications for SelecTone.



Voltage 24VDC
24VAC 50/60Hz
120VAC 50/60Hz
Certificate Number Ceiling
Operating Current 0.09 Amps at 24VDC
0.29 Amps at 24VAC
0.04 Amps at 120VAC
Operating Temperature Minimum -31 °F
Operating Temperature Maximum 151 °F
Standby Current 0.025 Amps at 24VDC
0.095 Amps at 24VAC
0.027 Amps at 120VAC
Decibel Output 88 at 10 Feet
98 at 1 Meter
Enclosure Rating Type 1
Ingress Protection (IP) IP41
Depth 2.530 in
Diameter 7.230 in
Net Weight 1.60 lb
Shipping Weight 2.30 lb


Product Literature
Product Manuals

Ordering Information

Model Types
Model Description UPC
50GCB-024 SelecTone speaker/amplifier, 24VAC/DC, round, ceiling mount, white 782979394709
50GCB-120 SelecTone speaker/amplifier, 120VAC, round, ceiling mount, white 782979394716
UTM Universal tone module 782979202172
TM33-SD Tone module, custom, Series D 782979227335
AM25CK Connector card, 25vrms 782979600855
AM70CK Connector card, 70vrms 782979600862
300CK Connector kit 782979391203
T-300CK 2.7 Vrms, 1 Vrms
E-300CK 1 Vrms, 1 Vrms
Product # Description UPC
R4NB Back box, ceiling speaker, 4 inch 782979200567
R4NB-1 Speaker backbox, 4 inch 782979235750