AKG Acoustics Music Mixer AS 8 User Manual

AS 8/AS 8TC  
Automatic Microphone Mixers  
Description  
Features  
While preserving the basic benefits of NOM attenuation and  
minimum recirculated sound, the AS 8 adds extremely simple  
setup, a seamless automatic mixing algorithm and low cost.  
State of the art analog audio circuitry is digitally controlled  
with a patented algorithm to provide exceptional  
performance and value.  
• Direct and mixed outputs  
• Mic/line selectable inputs  
• Built in Compressor/Leveler  
• Expansion ports for larger systems  
• Patented Adaptive Proportional  
Gain mixing algorithm*  
The Patented Adaptive Proportional Gain* algorithm is a  
unique process that allocates the gain applied to each  
channel after comparing the individual channel level with an  
overall reference level. The reference level is a mix of all  
active channels, so it automatically adapts to varying  
background noise levels in the room. The channel with the  
most signal receives the most gain. In addition to the  
adaptive gain allocation, the algorithm also provides an  
"intelligence" that prevents background noise and non-  
speech sounds from interfering with the auto mixing function.  
The algorithm also keeps track of which channel has been  
the most active (loudest for the longest time period) and  
skews a priority toward that channel. The automatic skewing  
is damped to keep it from responding to brief signal  
transients. A very smooth compressor/leveler is included to  
add an important finishing touch, making the AS 8 a  
complete automatic level control system. The  
compressor/leveler can protect amplifiers from overload and  
maintains a consistent audio level with varying voice levels at  
the microphones.  
The AS 8 was designed to operate with any type of  
microphone or line level source. DIP switches on the rear  
panel adjust the preamp gain range for the input level. Front  
panel controls provide a fine adjustment for an exact match  
into whatever component follows the AS 8 in the signal  
chain.  
Simple, accurate level adjustment is assured by a single  
front panel knob for each channel, which simultaneously  
adjusts the input gain and the level of participation in the  
gain allocation. Individual channel levels can be accurately  
adjusted by ear, using nothing other than a talker's voice as a  
sound source.  
The AS 8 is easily configured for transparent operation in  
any sound reinforcement, teleconferencing or recording  
application. Multiple units can be "daisy chained" for more  
than 8 channels. Connections for remote control pots or  
switches are provided for individual channels and for the  
overall mixed output.  
An RS-232 port allows most of the functions of the AS 8 to  
be controlled either by a computer or a dedicated control  
system such as AMX or Crestron. The current version of the  
software can also be downloaded from the Web site.  
The AS 8 TC features low and high frequency shelving  
controls on each inputchannel.  
• Low and high frequency shelving  
controls on each channel (AS8TC)  
®
• RS-232 controllable - AMX and  
TM  
Crestron compatible  
Specifications  
Mic/Line Input type:  
Impedance:  
Balanced and RF filtered  
>2.5K, any gain  
Input Gain Settings:  
EIN, 20-20KHz:  
0dB, +30dB, +50dB  
-126dB (+50dB gain)  
Maximum Input Level: +20dBu at 0dB gain  
-10dBu at +30dB gain  
-30dBu at +50dB gain  
Remote Level Control Range:  
6dB/Volt; 0 to 5V + off  
Compressor/Leveller: Threshold: -40dBu to 0dBu  
Maximum Gain Reduction:  
25dB  
Tone Controls (AS8TC): Shelving type  
Turnover freq: 1 kHz  
+/-10 dB at 100 Hz  
+/-10 dB at 1kHz  
Maximum System Gain:75dB (input to main out)  
System THD:  
System IMD:  
<0.1%; +10dBu out at any gain setting  
<0.1%; +10dBu out at any gain setting  
+15V (selectable per channel)  
Phantom Power:  
Power Consumption: 10 Watts max. @ 20VAC  
Weight:  
3 lbs., 4 ozs.  
13/4 x 8 x 19 inches  
Dimensions:  
ÂMX® is a registered trademark of AMX Corp.  
CrestronTM is a trademark of Crestron Electronics, Inc. USA  
*US Patent Numbers: 5,414,776 and 5,402,500  
 

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