Symetrix Releases New SPL Computer

Symetrix has completed the redesign of its widely-used line of microprocessor-based gain controllers with the release of the 371 SPL Computer.

The 371 is an updated version of the Symetrix 571, featuring refined processing algorithms and a lower cost-per-zone. Designed for installations featuring foreground or background music and/or paging, the 371 continuously monitors ambient noise conditions using an external microphone and adjusts the system gain proportionally.

With the 371, and its sister product the 372 SPL Computer, we’ve given consultants and contractors flexible, affordable ways to automatically manage audio levels,” according to Steve Kawasaki, Vice President, Business Development.

Simple step-through menus guide the installer through the 371’s setup. Menu adjustments determine the operating mode, select the response time and amount of gain adjustment, and enable an AGC algorithm for auto-leveling source material.

Settings viewed within the menu display include the current relative ambient noise level and a history of the lowest and highest SPL readings since the last calibration. System installers will appreciate the improved setup procedure, which permits the unit to be calibrated under typical environmental conditions–rather than the quietest time. A dedicated front panel output permits headphone monitoring of the sense signal, which can aid troubleshooting of the installation.

The 371 accepts mono or stereo line level audio through rear panel Euroblock connectors. Analog voltage-controlled amplifiers raise or lower the audio level in response to changes in ambient noise within the unit’s installation zone. The gain range is +20 and –30dB relative to unity gain. A separate ducker control input reduces the program level and inhibits the sense operation. The Symetrix 371 will be offered at the suggested US retail price of $549.