AES Section Meeting Reports

Wisconsin - July 23, 2016

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The main challenge was how to install a high quality system where you are not allowed to modify the room in anyway (due to the State Capitol Executive Residence Board protecting the historical building).

There are I/O frames strategically located in each block of black walnut desks that physically locate IP and OP connections near their sources and destinations. Each I/O frame can house up to 8 I/O cards; blank card plates prevent RF interference. All audio IPs go through dual gigabyte ethernet connectors to the core via ¾" conduit, and on to the Q LAN. All the lights and logic pass through a JL Cooper E box, a network device that has contact closure IPs and Ops. There is no "maybe" button.

There is a Crestron control processor but the completely integrated Q-SYS platform provides all the audio routing, processing, control and monitoring. It supports add-on requests like AEC and AV-to-USB Bridging. Q-SYS User Control Interface provides a means for the enduser to control parts of Q-SYS design through a network device and the Q-SYS touch screen.

Custom design allows the perception of the sound source to be more accurate. They requested that Q-SYS develop a custom 60 x 63 delay matrix for the Italian-marble-walled room. They used the Audio Toolbox to measure the 3,600 different delay times. I/P 1 to O/P 1 is 0 ms but 1 to 2 is delayed by 5 ms, some reaching 50 ms.

The mix: a high pass filter on each one, shelving filters, parametric EQ, and they have the ability to EQ each of the 51 mics independently. Not a Mix-Minus, but rather a Mix-Dim. Mic 1 to O/P 1 is ducked by 3 dB.

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AES - Audio Engineering Society