2
Input Channnels
1. Power Switch and LED
The power LED above the power switch will illuminate when the MM4D is turned on.
2. Mic & Line Inputs
All channels of the MM4D have balanced XLR microphone inputs for use with low-
impedance microphones.
In addition, channels 1 through 3 also feature ¼-inch TRS input jacks and will accept line
level, high-impedance signals from synthesizers, (unbalanced) microphones, electric pianos etc.
TRS (Tip = 0°, Ring = -180°, Sleeve = Gnd)
For convenience, channel 4 includes a dual-RCA line-level input instead of the ¼-inch jack.
Stereo signals from CD-Players or tape decks are easily used with the MM4D (stereo sources are
electronically summed into a mono signal when plugged into the dual-RCA jacks).
NOTE: Do not connect signals to both inputs on any one channel simultaneously. Use
either the unbalanced or the balanced input on any one channel, but not both. Connecting
to both inputs on one channel will cause improper operation of the input circuit.
3. Channel LEVEL Controls
Use the individual Level controls to adjust the comparative volumes of each channel.
4. Channel EFX Send Controls
The amount of Echo can be adjusted for individual channels by using the EFX control. A master
Echo Level control adjusts the total amount of effect at the final stage in the mixing bus.
5. Built-In Effects
The digital Effects, built into the MM4D, are extremely versatile. Adjusting the Repeat and
Delay settings produce excellent delay, reverb and echo effects. The Repeat control adjusts
the the amount of time the effect lasts while the Delay control adjusts the speed.
6. Channel Hi and Lo Controls
Each channel of the MM4D uses Lo and Hi shelving equalization centered at 80 Hz (Lo)
and 12 kHz (Hi).
The EQ controls have a +/- 15 dB boost/cut range providing greater versatility for shaping
the input signal’s tone. Signals remain unchanged when the controls are set to the center
(or “0”) position (a flat equalization setting).
7. MAIN Level Control
The MAIN level adjusts the overall output volume of the MM4D. Signals from channels 1
through 4 and Tape In jack are routed through to the main mixing bus.
8. Main Out / Amp In TRS Jack
When a ¼-inch TRS phone plug is inserted into the Main Out / Amp In jack, the MM4D’s
connection from the main mixing bus to the MM4D’s power amplifier is interrupted. (The
signal path going from the MM4D’s mixer to the internal amplifier is broken.)
It is possible to feed another power amplifier with the MM4D’s mix signal while the MM4D’s power
amplifier could be used for other purposes. Connect the Main Out to an auxiliary power amplifier’s
input directly. An external source can use the MM4D’s power amplifier by plugging into the Amp In.
1/4-inch Phone Plug
1/4-inch T.R.S. Phone Plug
XLR Plug
EFFECTS
Hi
LEVEL
EFX
Lo
Hi
LEVEL
EFX
Lo
Hi
LEVEL
EFX
Lo
Hi
LEVEL
EFX
Level
Repeat
Delay
TAPE
POWER
Lo
1
Mic
Line
2
Mic
Line
3
Mic
Line
4
Mic
Tape / CD
Line In
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
-15
+15
dB
-15
+15
dB
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
-15
+15
dB
-15
+15
dB
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
-15
+15
dB
-15
+15
dB
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
0
5
2
8
7
6
4
3
9
1
10
-15
+15
dB
-15
+15
dB
0
5
2
8
7
6
4
3
9
1
10
MAIN
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4 C h a n n e l P o w e r e d M i x e r