TelephoneStuff.com SM4T 扬声器

Surface Mount 4-Watt Ceiling Speaker is a 4-watt, multi-tap surface-mount speaker with a rotary switch, designed to typically install in less than a minute. It can be installed in any drop ceiling with ceiling tiles.Features:- Installs in less than a minute using a simple, three-step process- Can be installed in any drop ceiling with standard ceiling tiles- Rotary switch eliminates transformer tap wires- Compatible with both 70V and 25V systems- High intelligibility and efficiency- Direct and reflected sound paths create wide dispersion angle- Lightweight and durable plastic shell with an off-white, paintable finish- No tool installation- Color-coded mounting studs identify polarity to make the electrical connection easier (no external wires)- exterior volume control for easy balancing that is easily accessible, but doesn’t attract tampering- Contemporary design blends\/matches any decor- O-ring seal holds speaker tight to ceiling surface, eliminating whistling and ensures smoother sound without peaks- Textured studs easily pierce ceiling tile and secure wire nut connections- Wide-bottom, easy-to-handle mounting wing nuts provide secure speaker mounting- All necessary mounting hardware included- Selectable Power Taps: 4, 2, 1, 1\/2, 1\/4 (rotary switch selectable)- Frequency Response: 125 Hz-15 kHz- Sensitivity (min.): 90 dBspl- Controls: Volume control and Tap selector switch- Diameter: 9-1\/2\"- Height: 3\" (from tile surface)- Complies with NFPA National Code 160b and UL-2043