Crest Audio AM-411 AUTOMATIC MIXER User manual

SERIES
Features Description
• patented priority control circuitry
• single rack space package
• four microphone inputs
• LED clip status indicator on each channel
• 48 Volt phantom power on each input (switchable on chan-
nels 1 and 2 )
• recessed gain control for each channel
• channels 1 and 2 each have priority assign control
• channels 1 and 2 each have front panel mute button
• front panel master level meter (three-segment LED)
• line level inserts on each channel
• insert enable/bypass switch on each channel
• gain management computer logic for seamless automatic
operation
• audio and control bus linking
• rear panel master/slave linking mode switch
• master balanced output
• mic or line level master output with switch
• unbalanced aux out
• removable “euro” connectors for all audio connections
• rear panel power switch
• removable IEC power cable
The AM-411 is a professional, automatic microphone
audio mixer intended for fixed installation applications.
This single rack mount package is designed to provide
high quality audio performance and easy-to-use con-
trols. Engineered from the ground up, with the commer-
cial sound systems contractor in mind, the AM-411
includes removable screw connectors for easy installa-
tion and cost-effective servicing, as well as limited front
panel user control.
The AM-411 provides high quality audio operation, a
simple interface and an easy-to-install package. For
hands-free operation in new and existing sound sys-
tems, the AM-411 makes sound system operation easy
and reliable.
When using multiple microphones, gain control
becomes essential. As additional mics are turned on,
the levels of other active mics must be reduced to pre-
vent feedback. The AM-411 gain computer continuous-
ly senses the signal from each mic and quickly distrib-
utes the available gain among the channels in use so
that you won’t miss a single word. Using patented (US
Patent number 5,652,800) Priority Control Circuitry, the
AM-411 eliminates the irritating comb filtering that often
occurs when a person speaking into a wireless lapel
mic moves close to an active podium mic. With the addi-
tion of the AM-411’s ability to link multiple units, this unit
provides even more flexibility for a wide range of appli-
cations.
AMTM-411
Automatic Mixer

Specifications AMTM-411 Automatic Mixer
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500016*
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9/4/01
v.1.5
Architects’ & Engineers’ Specifications:
The automatic microphone mixer shall have four
electronically balanced, low noise microphone/line
inputs . Each input shall have its own gain control.
Input 1 and 2 shall each have the patented Priority
Control Circuitry with a priority assign and individ-
ual front panel mute controls. Each channel shall
have individual line level inserts with
enable/bypass switch. Forty-eight Volt phantom
power shall be available on all channels and be
switched on inputs 1 and 2. A security cover is
included, protecting the main controls on the front
panel with marking zones for each input. The mas-
ter section shall be equipped with gain manage-
ment computer logic for seamless operation. There
shall be a balanced mic or line master output with
switch. In addition, there is a master, unbalanced
auxiliary output. There is a master/ slave linking
connection and switch on the back panel for con-
nection to additional AM-411 units, and also the
AM-811 as well as the MM 623 mixer. All audio
connections shall be made with removable “euro”
type connectors. The mixer shall have a frequency
response of 75 Hz to 20 kHz +/- 1 dB. It shall have
an EIN of -128 dBu and the total harmonic distor-
tion shall be less than 0.1% at +4 dBu (22 Hz to 22
kHz BPF). The maximum line output level shall be
+21 dBu (hi-Z load), +18 dBu (600 load). The unit
shall be packaged in a rugged metal chassis 19”
wide by 1.75”high by 9.38”deep. The unit shall
operate from 120 VAC, 60 Hz domestic and from
230VAC, 50/60 Hz export.
test conditions:
reference:
INPUT SPECIFICATIONS
EIN:
preamp gain range:
input impedance:
priority (channels 1 and 2):
phantom power:
input sensitivity:
maximum input level:
common mode rejection:
OUTPUT SPECIFICATIONS
frequency response:
THD:
signal/noise:
output impedance:
nominal output level:
maximum output level:
GENERAL SPECIFICATIONS
channel clip LED:
output level indicators:
power requirements:
dimensions:
weight:
120 Vrms, 60 Hz line voltage maintained throughout testing
0 dBu = 0.775 Vrms
-128 dBu (R s = 150 Ohms), typical
10 dB - 65 dB (MIC inputs)
-13 dB - 44 dB (LINE inputs)
2K Ohms (Mic inputs)
>10K Ohms (LINE inputs)
>10K Ohms (INSERT inputs)
0 dB to 9 dB
+48 Volts
MIC inputs -61 dBu
LINE inputs -40 dBu
INSERT inputs +4 dBu
MIC inputs +12 dBu
LINE inputs +30 dBu
INSERT inputs +21 dBu
>70 dB 20 Hz - 20 kHz
75 Hz (-3 dB) to 20 kHz (-1 dB)
(at +4 dBu; reference: 1 kHz; 75 Hz HPF)
>0.1% at +4 dBu (22 Hz - 30 kHz BPF)
(R s = 150 Ohms; 30 kHz LPF)
>85 dB (all controls fully CCW)
>200 Ohms
LINE level output +4 dBu
MIC level output -26 dBu
INSERT outputs +4 dBu
LINE level output +21 dBu (hi-Z load)
+18 dBu (600 load)
MIC level output -9 dBu (hi-load)
-12 dBu (600 load)
INSERT outputs +21 dBu (hi-Z load)
red LED lights 2 dB before clipping
also lights to indicate mute on channel 1 and 2 inputs
red LED lights 2 dB before clipping
yellow LED lights at +4 dBu
green lights at -16 dBu
120 Vrms, 60 Hz domestic
230 Vrms, 50/60 Hz export
15 Watts nominal
1.75”x 19”x 9.38”(45 mm x 483 mm x 238 mm)
7.5 lbs (3.4 kg)