The Contemporary Research SMG-40 Sound Masking Generator has the power to drive over 30 25V plenum and ceiling speakers, 70V transformer, 4/8 ohm speakers, and over 100 Cambridge Qt® Emitters. Many masking generators use standard pink noise while the SMG-40 filtered noise is optimized for masking speech in real-world applications.

Housed in a compact metal enclosure, the amplifier can output 40W audio over two RJ-45 ports and a 3-pin Phoenix terminal for 25V, or 4/8 Ohm speakers and 70v transformer. A stereo Music input and level control is available for BGM applications. A contact closure input can mute the amplifier when activated.

• Employs pink noise optimized for speech privacy with bass, treble and level adjustment
• Supports 3.5mm stereo Music input with independent level control
• Drives speakers at 40 W RMS
• Dual RJ-45 outputs for Cambridge Qt Emitters
• Provides 3-pin captive-screw terminal for 25V and 4/8 Ohm speakers or 8 Ohm/70V transformer
• Includes closure input to mute amplifier
• Metal enclosure with flanges for surface mounting
• Made in America

• Dimensions: 5.5” [140mm] W (6.46” [168mm] inc. flange) x 2.375” [60mm] H x 3.875” [98mm] D
• Weight: 1 lbs [454g]
• Enclosure: All aluminum with durable black powder coat paint, flanges for surface mounting

• Amplifier: 40W RMS Class D, highly energy-efficient, operates with very little heat
• Masking Filter: Pink noise optimized for speech privacy

• Power: Green LED
• Masking: Masking level, Bass level, Treble level control
• Music: Level control

• Power: 2-pin Phoenix connector, 24 VDC, 2A max
• Music: Stereo line-level 3.5 mm jack, unbalanced, 7.5K ohms impedance, summed to mono
• Audio Mute: 2-pin Phoenix connector, closure mutes amplifier output
• Audio Output: Two RJ-45 Cat5 cable output for Cambridge Qt Emitters
  • Three-pin Phoenix connector for Com (GND), 25V, and 4/8 Ohms

• 5406-001, PS24-2.5 Power Supply
• Metal Enclosure with Surface Mounting Flanges