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371 SPL Computer

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Overview

A complete and affordable solution for audio level management.

The Symetrix 371 SPL Computer automatically raises and lowers sound system levels in response to changes in ambient noise conditions.
Designed for installations featuring foreground music and/or paging, it ensures that music and announcements are always clearly audible and distinct, but never too loud. Proprietary AmbiSense technology enables the 371 to continuously monitor changing ambient noise levels not just during gaps in the audio program so it can respond quickly to sudden changes. RC-3 Remote Volume Control is available for the 371.

A simple set of step-through menus displayed on the front panel LCD guides you through setup of the 371. You set the parameters of the acoustic environment and then set the way you want the unit to respond to changes in it. In operation, the 371 tracks environmental noise levels, internal signal levels and all the control settings. It makes appropriate gain changes whenever it finds measured characteristics. Menu adjustments determine how much the gain is changed, and how quickly that change occurs.

Features

Half rack space, ambient noise compensator.
Applications: Airports, Night Clubs, Retail Locations.
Continuously monitor ambient noise using a standard microphone.
Automatically adjusts volume to compensate for ambient noise conditions.
Headphone monitoring with output level control.
History displays the lowest and highest SPL readings.

Specs

371 SPL Computer Specifications:

Input/Output

Maximum Input Level: +20 dBu balanced, +20 dBu unbalanced
Program Input Impedance: >20 k ohms balanced, >10 k ohms unbalanced
Input Common Mode Rejection: >40 dB
Maximum Output Level: +26 dBu balanced (20 k ohm load), +22 dBm balanced (600 ohm load)
Output Impedance: 200 ohms balanced, 100 ohms unbalanced

Performance Data

Program Frequency Response: 20 Hz to 20 kHz, +0, ”1 dB
Program Path THD+N: <0.025% (+4 dBu in, +4 dBu out)
Output Gain Limits: +20, ”30 dB
Sense Channel Frequency Response: ”3 dB at 300 Hz and 6000 Hz
Sense Channel Gain: selectable, 0 dB to +70 dB
Additional Headphone Monitor Gain: 28 dB maximum
Program Channel Output Noise: ”95 dBu @ unity gain, typical
Master Output Level Adjustment Range: +/”10 dB internal,
+10 dB to ”50 dB remote

Connections

Line Inputs, Sense Input, Ducker Control,
Remote Gain, Line Outputs: Euroblock
Power In: 7-pin DIN
Headphone: 1/4 in. TRS, will drive mono or stereo headphones

Physical

Size (H x W x D) : 1/2 rack unit, 1.75 in. x 8.5 in. x 6.5 in. / 4.445 cm x 21.59 cm x 15.875 cm
Shipping Weight: 4.5 lbs./2.03 kg

Electrical

Power Requirements: 10 W maximum, Symetrix PS-3 or PS-3E only
PS-3 115 V, 60 Hz AC nominal
PS-3E 230 V, 50 Hz to 60 Hz AC nominal

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371 SPL Computer

A complete and affordable solution for audio level management.

Features

371 SPL Computer Specifications:

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