Simplex 4902-9721 — round off-white 4902 Series fire alarm speaker for ceiling or wall mount, with no lettering.
The 4902 Series reproduces tone and voice for evacuation and for background music, using a moisture-repellent 4 in. cone chosen for smooth response with minimal distortion. A multi-tapped transformer lets one speaker be set for either system voltage and any of four power taps, so output can be matched to the room after installation.
- Round housing, 7 1/2 in. diameter × 1/2 in. deep, extending 2 3/4 in. into the box
- Input 25 VRMS or 70.7 VRMS with 1/4 W, 1/2 W, 1 W and 2 W taps
- 79, 82, 85 and 88 dBA at 10 ft per UL 1480 reverberant chamber testing
- Fire alarm frequency response 400 Hz to 4000 Hz
- In and out wiring terminals accept 18 AWG to 12 AWG
- Rated 32°F to 100°F and UL listed to Standard 1480
The 4902-9722 is the same round speaker in red, while the rectangular 4902-9716 and 4902-9717 carry FIRE lettering and a different output row at 25 VRMS. Tile bridge 2905-9946 is the accessory named for this model.
