The DSP504 is a surface mounted ceiling speaker with a 70v/100v transformer built in. 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 4.5'' speaker driver is designed of wide frequency response(300-14,000Hz), the multiple terminals 1.5W, 3W & 6W can be applied to different occasions vary in area sizes and background noises; It is made of high quality engineering plastic, with long-term durability, and will never be out of shape or fading;No roof cutout direct mounting on ceiling by 4 screws ;waterproof, long life, with clear and sonorous sound.
This surface mount ceiling speaker is an ideal choice for industrial and commercial applications in hotel, school, office and factory where background music and paging is needed.

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DSP503 4.5 Inch 1.5W-10W Steel Ceiling SpeakerMarch 10, 2017The DSP503 is a ceiling speaker with a 70v/100v transformer built in. The 70v/100v transmission is realized in a high-voltage, low-current mode, which makes longer distance transmission and parallel c...viewwe will contact you within 24 hours.
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