Standard Spectra® Classic Speakers
The Lencore Spectra® Sound Masking LM6 and LM4 units consist of an individual self-contained noise generator, audio amplifier, and loudspeaker in a damped metal enclosure, powered by 16/18 volts AC and are capable of driving two secondary models.
Each main unit is solid state and consists of a CMOS/ MSI digital random sequence noise generator, electronic amplifier and filter for active spectrum shaping, and is equipped with a 10-step volume control plus an additional continuous volume control. Range of sound level: 56-86 dBA (measured at 1.5 feet from speaker). Additionally contained is a continuous and completely separate volume control for music/paging.
The masking system can be uniquely adjusted to suit a variety of standard and non-standard ceiling conditions by making adjustments to the amplitude and spectra shapes. This adjustment can be made in increments of +/ - ½ dB. In addition, the system has the adjustment capability to provide the most unobtrusive sound while obtaining the maximum speech privacy that meets ASTM E-1130 standards for speech privacy and sound uniformity.
The spectrum shape adjustment ranges from 1dB at 125 Hz to 20 dB at 8,000 Hz (typical)
Spectra Classic Speakers (consolidated) Data Sheet