SD72 - Loudspeaker Atlas Sound - Free user manual and instructions

Product Type	Ceiling Speaker
Brand	Atlas Sound
Model	SD72
Frequency Response	55 Hz - 8 kHz
Sensitivity	97 dB (1W/1M)
Power Handling (Max)	5 W (constant voltage)
Line Voltage Options	70.7V and 25V
Tap Wattage (70.7V)	0.25W, 0.5W, 1W, 2W, 5W
Tap Wattage (25V)	0.25W, 0.5W, 1W, 2W
Common Wire	Black
Driver Size	8 inches
Mounting	Compatible with all Atlas Sound 8" baffles (except FA series)
Compatible Mounting Rings	76-8(E2), P77-8, P78-8
Compatible T-Bridges	81-8R, 81-8S
Compatible Enclosures	(EZ)95-8 Series, T95-8 Series, O408, CS95-8, BMT95-8, BMT95-8-7
Installation	Use wire nuts to attach transformer wires; cut and cap unused leads
Application	Commercial sound, paging, background music
Maintenance	Clean with dry cloth; avoid moisture
Safety	Disconnect power before wiring; follow local electrical codes
Series Variants	SD72W and SD72WV (weatherized)

Frequently Asked Questions - SD72 Atlas Sound

How do I wire the SD72 speaker?

Use two wire nuts to attach the appropriate transformer wires to the field wiring. Cut off the bare portion of unused leads and terminate with wire nuts. The common wire is black.

What are the available tap settings for the SD72?

For 70.7V systems: 0.25W (red), 0.5W (white), 1W (yellow), 2W (blue), 5W (brown). For 25V systems: 0.25W (blue), 0.5W (gray), 1W (white/green), 2W (violet). Common is black for both.

Which baffles are compatible with the SD72?

The SD72 mounts to all Atlas Sound 8" baffles except the FA series. Models SD72W and SD72WV are compatible with specific mounting rings, T-bridges, and enclosures listed in the manual.

What is the frequency response of the SD72?

The frequency response is 55 Hz to 8 kHz.

What is the sensitivity of the SD72?

The sensitivity is 97 dB at 1 watt and 1 meter.

Can I use the SD72 with a 25V line?

Yes, the SD72 has separate transformer taps for 25V systems, with wattage options of 0.25W, 0.5W, 1W, and 2W.

What is the maximum power handling of the SD72?

The maximum power handling is 5 watts in a constant voltage system (70.7V).

How do I install the SD72 in a ceiling?

The SD72 is designed for use with compatible Atlas Sound 8" baffles and enclosures. Follow the wiring instructions and secure the speaker into the mounting hardware as per the manual.

Is the SD72 suitable for outdoor use?

The standard SD72 is not specifically rated for outdoor use. However, models SD72W and SD72WV are weatherized variants designed for damp or outdoor environments.

What tools are needed for wiring the SD72?

You will need wire nuts and wire cutters/strippers. For safety, use insulated tools and disconnect power before working.

USER MANUAL SD72 Atlas Sound

1. Use two wire nuts to attach the appropriate transformer wires to the field wiring.
2. Cut off the bare portion of the un-used leads and terminate with wire nuts.

Hardware Reference:

Model SD72 Mounts to all Atlas Sound 8" baffles except FA series

Models SD72W & SD72WV are compatible with the following Atlas Sound hardware items:

Mounting Rings: 76-8(E2), P77-8, P78-8

T-Bridges: 81-8R, 81-8S

Enclosures: (EZ)95-8 Series, T95-8 Series, O408, CS95-8, BMT95-8, BMT95-8-7

TAP WATTAGE	70.7V	TAP WATTAGE	25V
0.25	Red	0.25	Blue
0.5	White	0.5	Gray
1	Yellow	1	White/wGreen
2	Blue	2	Violet
5	Brown	5	Orange
COMMON	BLACK	COMMON	BLACK

Frequency Response: 55Hz-8kHz

Sensitivity: 97dB (1W/1M)