Crest Audio AM-811 AUTOMATIC MIXER User manual

SERIES
Features Description
• Switchable low cut filter (-3 dB at 100 Hz)
• Switchable phantom power (+48 Volts)
• Switchable manual or automatic operation
• Switchable mutebus (all attached channels can be muted
externally)
• Transformer balanced mic and line inputs
• Adjustable priority (channels 1 & 2)
• Defeatable signal processor loop on all channels
• External muting capability
• Direct outputs
• Activity logic output (TTL status)
General Features:
•Three sweepable notch filters
•Downward expander
•Transformer balanced outputs
•Easily linked to create 16, 24, 32…. channel mixer
•Remote volume capability
•Plexiglass security panel
The Crest AM-811 is a high quality automatic mixer with
eight transformer balanced mic/line inputs. Each chan-
nel provides a gain control, 48 Volt phantom power (mic
inputs), low cut filter, activity/clipping LED, an aux send
control, and a choice between manual or automatic
operation. Each channel also provides a defeatable
insert point, five Volt TTL status output, and can be
muted individually or multiple channels can be muted
simultaneously via an assignable mutebus. In addition,
channels one and two provide an adjustable priority
control.
The master section provides a gain trim control,
three1/9 octave sweepable notch filters, a downward
expander, transformer balanced outputs (main and aux)
and remote volume connections. The AM-811 has
been designed to easily link multiple units together to
form a single mixer with many more inputs (16, 24,
32…). The AM-811 is supplied with a see-through plex-
iglass security panel to prevent changes to the
installer’s settings.
AMTM-811
Automatic Mixer

Specifications AMTM-811 Automatic Mixer
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500017*
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9/4/01
v.1.5
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)
Architects’ & Engineers’ Specifications:
The automatic microphone mixer shall have four elec-
tronically 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 individual front
panel mute controls. Each channel shall have individ-
ual 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 secu-
rity cover is included, protecting the main controls on
the front panel with marking zones for each input. The
master 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 aux-
iliary output. There is a master/ slave linking connec-
tion and switch on the back panel for connection 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 distortion 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 230V
AC, 50/60 Hz export.