Crest Audio MM 623 PROGRAM AUDIO MIXER User manual

Output
Left/Right
Aux
Min Load
Impedance
600 Ohms
600 Ohms
Nom
+4 dBu
+4 dBu
Max
+21 dBu
+19 dBm
+21 dBu
+19 dBm
Balanced
UnBalanced
Balanced
Balanced
Connector
+
-
Ground
+
-
Ground
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500019*
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9/5/01
v.1.5
SERIES
Features Description
• six balanced mic/line inputs (transformer optional )
• mic/line inputs assignable per channel to L,R and
Aux buses
• channel one mute capability, variable threshold
• two selectable RCA stereo or mono line inputs
• three electronically balanced line outputs: Master
L, R and Aux
• four-band EQ on Master L, R out
• remote Master level control
• euro style I/O connectors
• 48 VDC phantom power, selectable per channel
• remote stereo input select or remote stereo mute
The MM 623 is a versatile, high quality mixer
designed with the professional in mind. Offering six
microphone inputs, two selectable stereo inputs,
and such features as bus assignment, phantom
power, remote master, Left, Right, and Aux out-
puts, this compact unit is perfectly suited to mod-
ern diverse applications. All inputs and outputs are
electronically balanced. Equalization is performed
by an active, four-band, fixed frequency stereo EQ.
There are three five-segment LED meters moni-
toring each of the main outputs.
Each of the microphone inputs has switchable
phantom power and a 20 dB pad for line level sig-
nals. Channel one has a variable threshold for
ducking all other inputs. The unit offers remote
select of the two stereo inputs. The unit can also
be set as master or slave and all audio and control
buses are linkable. All connections are offered on
pluggable Euro connectors. The MM 623 offers a
multitude of features in one EIA rack space.
MMTM 623
Program Audio Mixer
Output Level
0 dBu = 0.775 V (rms) 0 dBu = 1 mW
Output Specifications:

Specifications MMTM 623 Program Audio Mixer Specifications MMTM 623 Program Audio Mixer
Architects’ & Engineers’ Specifications:
The mixer shall have six electronically bal-
anced microphone or line inputs. The mixer
shall also have two stereo unbalanced line
inputs. All inputs shall be routable to any or all
of three master buses, Left, Right and Aux.
Each microphone input shall include selectable
48 Volt phantom power. Channel one shall
have a variable mute threshold over all other
channels. Each input shall have a Signal/Clip
indicator that activates green at -20 dB, and
turns red at 2 dB below clipping. The mixer
shall have three electronically balanced out-
puts, Left, Right and Aux, each with its own
master output control and five LED meter array.
The mixer shall have remote master capability
for each of the master L,R buses. There shall
be remote select for the two stereo inputs, rear
panel global 100 Hz low cut filter for the mic
inputs, master/slave link mode switch, and
audio bus linking. The mixer shall have a shelv-
ing low EQ with 15 dB boost or cut starting at
70 Hz, a peak/dip low mid EQ with 15 dB boost
or cut at 250 Hz. The unit shall be housed in a
rugged metal chassis 1.75”tall by 19”wide by
8.75”deep. One-inch mounting flanges will be
provided on each side. The unit shall operate
from 120V AC, 60 Hz power. The mixer shall be
capable of driving +21 dBu into a balanced load
from the Left, Right or Aux outputs, from 20 Hz
to 20 kHz. +0 to -2 dB into 600 Ohms with less
than 0.1% distortion and with system hum and
noise at least 80 dB below rated output.
Test Conditions: 120 Vac 60 Hz maintained throughout testing.
0 dBu = 0.775 V (rms)
0 dBu = 1.00 V (rms
*Min. input level (sensitivity) is the smallest signal that will produce a nominal output with controls set at maximum gain.
**Nominal settings are defined as all controls set at center detent for nominal output. Microphone gain control is as specified.
Input Specifications:
Input Input gain- Input Level, dBu
Impedance pot setting Balanced/
Input (Ohms) Min.* Nom.** Max. Unbalanced Connector
Max gain
Microphone 2k +60 dB -76 dBu -56 dBu -39 dBu +
without pad Min gain Balanced -
+10 dB -25 dBu -4 dBu +13 dBu Ground
Max gain
Microphone 2k +40 dBu -56 dBu -36 dBu -19 dBu +
with pad Min gain Balanced -
-10 dB -5 dBu +16 dBu +33 dBu Ground
Max gain
Microphone 2k +60 dB -74 dBu -54 dBu -37 dBu +
without pad Min gain Balanced -
(optional +20 dB -34 dBu -14 dBu +3 dBu Ground
transformer)
Max gain
Microphone 2k +40 dB -54 dBu -34 dBu -17 dBu +
with pad Min gain Balanced -
(optional 0 dB -14 dBu +6 dBu +23 dBu Ground
transforme)r
Stereo Line 10k N/A -20 dBV -10 dBV +7 dBV Unbalanced RCA jacks
Noise:
Output Signal/Noise (typical) Test Conditions
Left/Right 100 dB All level controls down
84 dB Master level control nominal
Channel level controls down
80 dB All controls nominal
All channels assigned
Mic gain minimum
Aux 95 dB All level controls down
92 dB Master level control nominal
Channel level controls down
81 dB All controls nominal
All channels assigned
Mic gain minimum
MM 623 program audio mixer
Mic input range without pad: 10 d to 60 d
Mic input to output without pad: 80 d max
Mic input range with pad: -10 d to 40 d
Mic input to output with pad: 60 d max
Mic input range without pad (optional transformer): 20 d to 60 d
Mic input to 0utput without pad (optional transformer): 80 d max
Mic input range with pad (optional transformer): 0 d to 40 d
Mic input to output with pad (optional transformer): 60d max
20 Hz - 20 kHz+0 d /-1 d
<0.1% typical
20 Hz - 20 kHz; Mic to L-R out (22 Hz - 22 kHz W)
-128 d u
Mic input terminated with 150 Ohms
>70 d typical
20 Hz - 20 kHz
>70 d typical adjacent channels (1 kHz)
>60 d typical output to output (1 kHz)
+48 Volts at mic + and - inputs
10k Ohm potentiometer 30 d attenuation
100k Ohm potentiometer 60 d attenuation
>60 d attenuation
Input Channel Status:
Green: -20 d u
Red: 2 d below clipping
Output Level Meters:
-24: -20 d u
-6: -2 d u
0: +4 d u
+6: +10 d u
Clip: 2 d below clipping
Domestic: 120 Vac, 60 Hz 15 Watts nominal
Export: 230 Vac, 50/60 Hz 15 Watts nominal
1.75" x 19” x 8.75" (45 mm x 483 mm x 222 mm)
7.4 pounds (3.4 kg)
gain
frequency response
total harmonic distortion and noise
equivalent input noise (E N)
common mode rejection ratio (mic input)
crosstalk
phantom power
remote volume control
channel mute
signal/clip indicators
power requirements
dimension (H x W x D)
weight