Signal Processing Systems : Related Signal Processing Products : Gold Line - SLC2

Sound Level Control w/o Muting System

Model: SLC2

Triggering Circuit:
This circuit will respond when the SLC1/SLC2 monitors a sound which is over the user's specified level.
A switched output control relay and an audio attenuation circuit will be triggered.
Switched Output Control:
The SLC1/SLC2 provides a rear panel mounted terminal strip to which an installer can connect ancillary equipment suitable for the installation.

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The New Model SLC2 is a single rack space Sound Pressure Level meter with special triggering circuits. When monitored sound exceeds a specified level, a relay connected to a switched output is activated. The switched output can then activate connected ancillary equipment which can be used to notify the manager, light a light, ring a bell, or activate a compressor. It can even be used to activate a counter to determine how often sound exceeds the specified level. The choice of ancillary equipment is made by the installer to accommodate the particular situation.

Triggering Circuit:
This circuit will respond when the SLC1/SLC2 monitors a sound which is over the user's specified level.
A switched output control relay and an audio attenuation circuit will be triggered.
Switched Output Control:
The SLC1/SLC2 provides a rear panel mounted terminal strip to which an installer can connect ancillary equipment suitable for the installation.
This terminal strip becomes "active" when the switched output control relay is triggered.
Connected equipment can range from a simple light bulb to a heavy duty solid state relay capable of handling multiple announcement devices.
Audio Attenuation Circuit:
The SLC1 will accommodate two audio channels.
The input and output connectors for these channels are hard wired through the unit and will not interfere with the sound quality.
If connected, the audio attenuation circuit will reduce the all over sound level by 6db (20%) for a 5 second interval.
If the sound level is not reduced the circuit will be repeatedly activated to reduce the sound level for 5 second intervals.
The switched output control circuit and the audio attenuation circuit can be utilized simultaneously or independently.
The Controls
Set: (SLC1/SLC2)
The set control is provided to specify the maximum allowable sound level.
SPL Weight: (SLC1/SLC2)
Measurements can be made in SPL FLAT, A, or C.
The Response Control: (SLC1 Only)
A potentiometer is provided to determine how quickly the SLC1 will respond to a signal that exceeds the specified level.
At minimum the SLC1 is most sensitive and will respond quickly to a small amount of overage.
As the control is advanced, it will take longer to respond to the same amount of overage but will respond more quickly to a larger overage.
At maximum the SLC1 will take a while to respond to a small overage but will respond relatively quickly to a large overage.
Recovery Control: (SLC1 Only)
This control has been pre-set by the factory to cover most situations. A cap has been placed over the control.
For special applications the customer can remove the cap and re-set this control.
The recovery control determines how quickly the SLC1 responds to occasional bursts that exceed the specified level.
At minimum the SLC1 will ignore short duration bursts that exceed the specified sound level.
As the control is advanced, the SLC1 will retain the effect of shorts bursts longer resulting in a more sensitive response.
At maximum the unit will be factoring in any overages regardless of duration.
Reset Delay Control: (SLC1 Only)
The reset control sets the time interval after the relay is triggered before it will allow the relay to trigger again.
The minimum interval is approximately 10 seconds and the maximum interval approximately 120 seconds.

Tester Format - Standalone Component (Box)

Current Draw: 0.50 Amps
DC Voltage: 12 Volts
Depth: 215.90 mm
Height: 44.45 mm
Width: 482.60 mm
Product Weight: 15.42 kg
Microphone Input: 47dB - 123dB SPL
Inputs: Microphone XLR 3 pin jack. Pin (1) Ground, Pin (2) Hot, Pin (
Outputs: Switched terminals Fused 2 position terminal strip rated @ 1A, 125Vac RCA jacks
Display (SPL): 3 digit via 7 segment display
Trigger Level: 60 - 120 dB typical
Response, Recovery Times: Inter-related, varies depending on type of signal vs. control settings.
Reset Delay: 10 - 120 S
Monitored Source Level Reduction: 6dB (20%) for 5s.
Weighting: IEC A, C and Flat.
Power: 12Vdc @ 500mA via 3.5mm jack (battery eliminator supplied).
Case Material: Painted aluminum.

Gold Line SLC1 SLC2 Manual.pdf 27 kb - Instructions

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