The PAC+ Programmable Audio Controller is a rack mounted unit that programs the level of the masking noise, paging and music according to the day and the time of day.

Signal levels are ramped down and up over a period of time.

A device of this type is essential to the acceptance of a speech privacy system by the occupants of the space by helping to keep the masking noise unobtrusive during periods of low office population and effective during normal working hours.

Benefits of time/level controlled masking:

• Adapts to speech privacy requirements, reducing masking noise level at nights and weekends when office population is low. The masking noise may also be reduced during lunch.
• Off-hours security is improved when masking noise is reduced as unusual noises become more obvious.

Benefits of timed music level control:

• Reduces music levels during off-hours, providing a more adaptive environment and improves security.
• Provides a control mechanism to conform to urban noise codes for outdoor background music.

PAC+ Features:

• Timed level control of up to 6 channels of any program material.
• Up to 4 timed level cycles per channel per day.
• Individual day control of all days, normally used for weekends.
• Fully Field Programmable from the front panel.
• Attenuation programmable from 0 to 24dB in 1.5dB steps.
• Level changes are made in 3/8dB steps for super-smooth transitions.
• Channels may be locked together to assure tracking or programmed separately for different time programs.
• Automatic programming lock prevents program tampering; no security covers are needed.
• Built-in pink noise generators optional. 1 to 6 channels of noncoherent pink noise. Two channel masking systems are typical.
• Slo-start is standard in all models. Automatically inches-up the masking noise at midnight over 10 days without costly return trips. This reduces the psychological impact of adding masking noise to the occupied space.
• Clock and field programmed time and level entries are totally non-volatile with over 10 years of operation in the absence of power. Clock and RAM assembly is plug-in replaceable.
• Automatic daylight saving time and leap year adjustment. Now compatible with new extended 2007 daylight saving time.
• At power-up the PAC+ soft starts, eliminating instantaneous high level noise when AC returns after a power failure.
• Full input and output transformer isolation for high common mode hum rejection: 5k ohm bridging inputs, 600 ohm outputs.
• Stable proven design.
  All solid state, no relays.
• UL and CSA listed power supply attached to reduce rack clutter.