User manual AKG AS8

[. . . ] AS8/AS8TC 8 Channel Automatic Matrix Mixer OPERATING INSTRUCTIONS and trouble-shooting guide INTRODUCTION The AKG AS8 Automatic Microphone Mixer is an 8 channel, single rack space audio mixer. Using the unique Adaptive Level Proportional mixing algorithm, the automatic action is inaudible and simple to set up. The AS8 offers remote control of all channel levels and the master level. In addition, a sophisticated compressor/ leveller is included for dynamic range control of the audio program material. [. . . ] There are no adjustments inside that will make a malfunctioning unit start working. AKG Acoustics service department is equipped and staffed to quickly repair your equipment. In-warranty repairs are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for out of warranty repairs. RETURNING UNITS FOR REPAIR Please contact your local AKG distributor for instructions on how to send your unit in for service. You will save yourself time and trouble if you will follow the steps below: A. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or damage to equipment that you ship. International: AKG Acoustics GmbH Lemböckgasse 21­25, A-1230 P. O. B. 158 Vienna/AUSTRIA Tel: (43 1) 86 654-0* Fax: (43 1) 86 654-516 Email: service@akg-acoustics. com US: AKG Acoustics, US 914 Airpark Center Drive Nashville, TN 37217 USA Main: (615) 620-3800 FAX: (615) 620-3875 Email: akgusa@harman. com Internet: http://www. akg-acoustics. com 10 SPECIFICATIONS Mic/Line Input Type: Impedance: Input Gain Settings: Maximum Input Level: Tone Controls: Electronically balanced and RF filtered Greater than 2. 5K, any gain setting 0dB, +30dB, +50dB EIN, 20-20KHz: ­126dBu (+50dB gain) +20dBu at 0dB gain ­10dBu at +30dB gain -30dBu at +50dB gain Shelving controls Turnover frequency 1kHz +/­ 10dB at 100 Hz; +/­ 10dB at 10 kHz 200 Ohms balanced; 100 Ohms unbalanced +26dBu, 10k load 100 Ohms, unbalanced +20dBu, 10k load 6dB/Volt from 0 to 5V, plus off Main Out Impedance: Max output level: Direct Outputs Impedance: Max output level: Remote Level Control Range: Serial Communication (RS-232): 9600 baud, 8 data bits, no parity, 1 stop bit Compressor/Leveller Threshold: Maximum Gain Reduction: Maximum System Gain Input to Main Out: System THD: System IMD: Phantom Power: Power Consumption: Weight: Dimensions: ­40dBu to 0dBu 25dB (10dB leveling, 15dB compression) 82dB Less than 0. 1%, any gain setting (+10dBu out) Less than 0. 1%, any gain setting (+10dBu out) +15V, switch selectable per channel 10 Watts max at 20VAC 3 lbs, 4 ozs 19"wide x 1. 75"high x 8"deep Specifications subject to change without notice. This product meets the CE Compliance Standards - EN55022 and EN50082-1:1998. 11 SERIAL CABLE WIRING DIAGRAMS The serial port on the AS8 is a minimal RS-232 implementation. The figure shows the wiring diagram to accommodate interconnection with either a 9 or a 25 pin serial port on a PC or other serial device. AMX PROGRAMMING NOTES If you are using an AMX system to control your LecNet equipment, you'll want to purchase the Lectrosonics PT3 Protocol Translator. With the PT3, the LecNet equipment looks just like native AMX equipment. The PT3 is the fastest and most productive way to control LecNet devices with an AMX system. 12 SERIAL PORT COMMANDS AVAILABLE All LecNet devices use a modification of the typical one-to-one connection between two RS-232 compatible devices. The transmitter section is "tri-stated", or placed in a high impedance mode, until the particular device is addressed. To facilitate the simple parallel connection of multiple devices on a single RS-232 port, an addressing scheme is employed to route commands from the host to the proper LecNet device. When a device receives its address from the host computer, it temporarily turns on its RS-232 transmitter long enough to send whatever data is requested by the host. In this way, multiple devices may drive a single transmit signal back to the host, because only the addressed device will turn on its transmitter. Because a LecNet device will interpret any single data byte whose value is greater than 127 as an address, single byte data (as opposed to addresses) sent from the host must be in the range of 0-127. If a data value needs to be sent from the host that exceeds 127, the host must format two bytes of output such that the first byte is the lower 7 bits of the 8 bit value, and the second byte is 1 if the MSB of the data byte is 1, or 0 if the MSB of the data byte is 0. All interchange of commands and data with any LecNet device should be done in hex rather than ASCII. The only exception to this is the return data on the Get Device Name command (see command description below). [. . . ] Host sends command - 8 Host receives 1 byte: 0-127 (0-7F hex), corresponding to -42. 33dBu to 0dBu Get Compressor/Leveller Threshold - Allows the host to set a value for the compressor/leveller threshold to be stored in EEPROM. This command is only available when the Threshold Read Flag is set to 1 (see "Set Compressor/Leveller Threshold Read Flag" command below). Host sends command - 9 Host sends data byte: 0-127 (0-7F hex), corresponding to -42. 33dBu to 0dBu threshold. Set Compressor/Leveller Threshold Read Flag - Allows the host to set the value of the Threshold Read Flag. [. . . ]