Aiphone SP-2570N - Ceiling Speaker, 25/70V Transformer, 5W

The SP-2570N connects to a paging amplifier with either 25V or 70.7V output through its built-in transformer. It can also run at 8 ohms direct if you are wiring it to a low impedance amp instead of a constant voltage line. So one part covers both distributed 70V paging runs and a simple 8 ohm connection.

Plan around an 8 inch speaker with a 12-7/8 inch baffle and 2-3/4 inch depth. The baffle diameter is what covers the opening, and the 2-3/4 inch depth is what has to clear above the tile or drywall. In a hard lid ceiling with tight joist space, measure that 2-3/4 inches before you cut.

Five wattage taps are provided: 0.312W, 0.625W, 1.25W, 2.5W and 5W. That is a roughly 12 dB range from lowest to highest tap, so you set a quiet office or corridor low and a warehouse or lobby at 5W, and you also use the taps to keep the total tapped wattage on the line inside your amplifier's rating.

No. The SP-2570N is an indoor, ceiling flush-mount speaker with a white baffle. Loading docks, parking areas and exterior entries need a weather rated horn or outdoor speaker instead. Don't put this one in an unconditioned or wet location just because there is a ceiling over it.

For voice paging and announcements, the dual cone design is the normal choice, and the SP-2570N covers 65Hz to 17KHz, which is well past the range speech intelligibility needs. Where you would step away from a cone ceiling speaker is high ambient noise or long throw outdoors, which is horn territory, or full range background music where a coaxial driver is the usual answer.

It is a commercial rated overhead paging speaker, built for flush ceiling mounting and driven from a 25V or 70.7V amplifier line, which is the distributed system architecture schools, offices and healthcare facilities run. The constant voltage line is what lets you hang many speakers off one amplifier across a building.

Add up the tap settings, not the speaker count. On a 70.7V line each SP-2570N draws whatever tap you set it to, from 0.312W up to 5W, and the sum has to stay under your amplifier's rated output with headroom. Twenty speakers tapped at 1.25W is 25W of load; the same twenty at 5W is 100W. Tapping down is how you get more speakers onto the same amp.

Order Aiphone SP-2570N. That single model number covers the 8 inch dual cone speaker, the 12-7/8 inch white baffle and the 25/70V transformer with the 5W top tap, all as one assembly. There are no finish or size choices to specify.