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Applications
Application 4 - Using the MPL 1640 as a recording mixer
You can also use the MPL 1640 as a recording mixer when making simple recordings (for example, when recording a
rehearsal or practice session direct to open-reel two-track, cassette, or DAT recorder). Microphones and line level
signals are connected to various channel inputs. Signal processors are connected to Aux sends and returns and to
channel inserts as required. A submix from Aux send 1 is connected to the input of a headphone amplifier driving cue
headphones so that performers can receive a headphone mix independent of the main control room mix. Finally, the
Main Mix outputs are connected to the inputs of a two-track or DAT recorder, with the outputs of the two-track or DAT
recorder connected to channels 15 and 16. These two channels are routed to Bus 3/4 (by pressing in their Bus
switches), and the Bus 3/4 outputs are connected to a power amplifier driving the control room speakers. The Main Mix
inserts are connected to a dynamics processor (compressor/limiter) in order to automatically limit the mixed signal going
to tape, while the Bus 3/4 inserts are connected to a graphic equalizer in order to “tune” the control room so as to provide
accurate frequency response. In this setup, the Main L/R faders control the signal level going to tape, while the Bus 3/4
level knob controls the playback volume (you’ll want to set the tape recorder to monitor input signal while recording).
One significant advantage of using this kind of setup is that it allows you to continuously monitor the signal arriving at the
two-track tape recorder, as opposed to simply monitoring the signals arriving at the MPL 1640 inputs.
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
CH 1CH 2
CH 3CH 4
CH 5
CH 1
CH 2CH 3
CH 4CH 5
CH 6
CH 7CH 8CH 9CH 10CH 11CH 12CH 13CH 14CH 15CH 16
ON
OFF
1
2
3
CH 6
1
2
3
CH 7
1
2
3
CH 8
1
2
3
CH 9
1
2
3
CH 10
CH 11
CH 12CH 13CH 14
CH 15
CH 16
115
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!
ON
OFF
~115V /230V
50/60Hz 42W
MAIN MIX OUT
(BALANCED 600Ω
+ 4dB)
P
O
W
E
R
PHANTOM
SERIAL
NUMBER
AVIS:
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR.
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE.
XLR
1 GND
2 +
3 -
MPL 1640
16 CHANNEL
AUDIO MIXER
TIP RING SLEEVE
TIP +
RING -
SLEEVE GND
ASSEMBLED IN R.O.K.
SAMSON TECHNOLOGIES CORP., NEW YORK, U.S.A.
SAMSON
L
CHANNEL INSERT
(TIP RETURN - RING SEND)
AUX 1AUX 2
3L - 4RMAIN MIX
R
L
AUX 3
AUX 3
AUX 2
AUX 1
AUX RETURN (UNBAL.2KΩ
+ 4dB)
R
RR
L
LL
(BALANCED - 50dB TO + 4dB)
MIC INPUT
R
3L - 4R(UNBAL.2KΩ +4dB)
BUSS INSERT
AUX OUT
(UNBAL.2KΩ +4dB)
LINE INPUT
(BALANCED 10 KΩ - 40dB
TO + 4dB)
SIGNAL PROCESSOR
SIGNAL PROCESSOR
MIDI TONE GENERATOR
SERVO - 240
SAMSON
STEREO AMPLIFIER
DAT
COMPRESSOR / LIMITER
Q5 HEADPHONE AMPLIFIER
Q5
20Hz 25Hz 31.5Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz200Hz 250Hz315Hz 400Hz
500Hz
630Hz 800Hz 1Khz 1.25Khz1.6Khz 2Khz 2.5Khz3.15Khz 4Khz 5Khz6.3Khz 8Khz 10Khz12.5Khz 16Khz20Khz
20Khz
16Khz
12.5Khz10Khz8Khz6.3Khz5Khz4Khz3.15Khz2.5Khz2Khz1.6Khz1.25Khz1Khz800Hz630Hz500Hz400Hz315Hz250Hz200Hz
160Hz
125Hz100Hz80Hz63Hz50Hz40Hz31.5Hz25Hz20Hz
+15db
0
-15db
0
+15db
-15db
-15db
+15db
0
+15db
-15db
0
SAMSON
1/3 OCTAVE DUAL 31 BAND GRAPHIC EQUALIZER
E62
POWER
BYPASS
BYPASS
PEAK
PEAK
GRAPHIC EQUALIZER