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AS 8/AS 8 TC
Automatic Microphone Mixers
Description
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.
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.
ÂMX
®
is a registered trademark of AMX Corp.
Crestron
TM
is a trademark of Crestron Electronics, Inc. USA
*US Patent Numbers: 5,414,776 and 5,402,500
Features
• Direct and mixed outputs
• Mic/line selectable inputs
• Built in Compressor/Leveler
• Expansion ports for larger systems
• Patented Adaptive Proportional
Gain mixing algorithm*
• Low and high frequency shelving
controls on each channel (AS8TC)
• RS-232 controllable - AMX
®
and
Crestron
TM
compatible
Specifications
Mic/Line Input type: Balanced and RF filtered
Impedance: >2.5K, any gain
Input Gain Settings: 0dB, +30dB, +50dB
EIN, 20-20KHz: -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: <0.1%; +10dBu out at any gain setting
System IMD: <0.1%; +10dBu out at any gain setting
Phantom Power: +15V (selectable per channel)
Power Consumption: 10 Watts max. @ 20VAC
Weight: 3 lbs., 4 ozs.
Dimensions: 1
3
/4 x 8 x 19 inches