The DSP159 is a sound projector ceiling speaker, which can be switched between the voltage terminal and the ohms terminal. The 70v/100v transmission is realized in a high-voltage, low-current mode, which makes longer distance transmission and parallel connection of multiple loudspeakers possible.
The built-in 6.5” speaker driver is designed of wide frequency response 100-20,000Hz, and rated power is 30W. It is made of high quality engineering plastic, which ensures long-term durability, and will never be out of shape or fading; Construction of dual-crossover, its flush mount type makes the easy and secure installation; High definition voice quality, good performance of bass, clear and sonorous sound.
It is an ideal choice for industrial and commercial applications in hotel, school, office and factory where backgroundmusic and paging is needed. 
Built-in 100v/70v transformer
In-ceiling type loudspeaker
6.5” paper cone driver unit
Rated power output at 30W
High sensitivity(96±2dB)
With voltage and ohms terminal
ABS baffle and metal grill with fireproof cover
Secure flush mount installation
High definition voice/music quality