Data Sheet

built‑in level adjustment feature allowing for a faster
and easier installation. These speakers mount on the
indicated back boxes for the indicated applications:
Conduit
Applications
Surface
Mounted
Flush Mounted
Four‑inch square* •
SBB Back Box • •
* Requires an SER extension ring.
Wiring
The input terminals accept wires with diameters
between 18 AWG and 12 AWG (ISO 0.75 mm
2
and
4 mm
2
).
Parts included
Quant. Component
1 Speaker
1 Mounting Plate
1 Hardware pack
1 Literature pack
Technical specifications
Electrical
Power Requirements
Voltage (input): 24 VDC nominal;
16 VDC or FWR to 33 VDC or FWR
Environmental
Relative Humidity: Up to 85%, non‑condensing
Temperature (Operating): +32°F to +120°F (0° to +49°C)
Mechanical
Dimensions (diameter x D): 7.25 in. x 2.9 in. (18.4 cm x 7.5 cm)
Material: Molded plastic
Speaker Volume at 10 ft (3 m)
0.125 (1/8) W: 75 dBA
0.25 (1/4) W: 78 dBA
0.5 (1/2) W: 81 dBA
1 W: 84 dBA
2 W: 87 dBA
4 W: 90 dBA
8 W: 93 dBA
Ordering information
ET90‑N High‑Performance Speaker (nickel)
Nickel finish, 24 VDC device providing high audio
output with clear audibility, dual voltage capability
(25 VRMS or 70 VRMS), and field‑selectable taps from
1/8 W to 8 W
Order number ET90-N
ET90‑R High‑Performance Speaker (red)
Red, 24 VDC device providing high audio output with
clear audibility, dual voltage capability (25 VRMS or
70 VRMS), and field‑selectable taps from 1/8 W to 8 W
Order number ET90-R
ET90‑W High‑Performance Speaker (white)
White, 24 VDC device providing high audio output with
clear audibility, dual voltage capability (25 VRMS or
70 VRMS), and field‑selectable taps from 1/8 W to 8 W
Order number ET90-W
Accessories
SBB‑R Surface‑mount Back Box (red)
14 cm (5.5 in.) x 14.2 cm (5.6 in.) x 9.1 cm (3.6 in.)
Order number SBB-R
SBB‑W Surface‑mount Back Box (white)
14 cm (5.5 in.) x 14.2 cm (5.6 in.) x 9.1 cm (3.6 in.)
Order number SBB-W
SER‑R Square Semi‑flush Extension Ring (red)
12.7 cm (5 in.) square by 4 cm (1.5625 in.) deep
Order number SER-R
SER‑W Square Semi‑flush Extension Ring (white)
12.7 cm (5 in.) square by 4 cm (1.5625 in.) deep
Order number SER-W
SSB‑4 Ceiling Support Bridge
60.3 cm (23.75 in.) long by 16.5 cm (6.5 in.) wide
Order number SSB-4
2 | ET90 High‑performance Speakers