Manual-5
MM 8z CONNECTION
With the MM 8z’s ability to accommodate a wide variety
of systems, these basic guidelines will assist the user in
incorporating this mixer into their equipment setup.
Since most source components (e.g., turntables, disc
players, tape decks) used with the mixer are consumer grade,
the MM 8z features unbalanced RCA Source Input connec-
tors.
When using the PH/LN inputs, be sure the adjacent switch
is in the correct position for the connected device: pushbutton
in
for phono,
out
for line level. Ground screws attach the
turntable ground wires, which help eliminate hum or buzz.
The front and rear panel Main Mic Inputs are XLR
connectors, for use with a balanced output microphone of any
impedance. Use only one mic at a time in the front
or
rear
jack. Effects can be inserted in the Main Mic signal path thru
the ¼" unbalanced TRS MAIN MIC LOOP jack. Use a
special TRS send/return cable: tip = send, ring = return,
sleeve = ground. Refer to the wiring diagram below. The
Auxiliary Mic input is ¼" balanced TRS jack, useful for
wireless mics and other high-impedance sources.
The MAIN OUTPUTS are ¼" balanced TRS connectors,
which provide good hum rejection and allow long (greater
than 10 feet) lengths of interconnect cable without significant
losses (see
Sound System Interconnection
on page Manual-10
for proper wiring of connector/cable). The PROGRAM LOOP
has left and right ¼" unbalanced TRS connectors for sending
the Source program signal to an external effects device and
returning the signal back to the mixer. Use a special TRS
send/return cable: Tip = send, Ring = return, Sleeve = ground.
Refer to the wiring diagram below. Remember, these are
switching jacks—always complete the loop when connecting
the send to and return from an external device.
Two sets of outputs can provide convenient connections
for recording equipment. The TAPE OUTPUT unbalanced
RCA jacks provide an output for recording program material.
If you want signal processing via the Program Loop to have
an effect on the recording, let
out
the PRE/POST Record
push-button to the POST position. The TAPE OUTPUT
does
not contain any signal from the Mic or Aux In sections
. If you
need to record the mics, use the Aux Out for your recording
signal; this output is a composite of the Program, Micro-
phone, and Aux Inputs.
Send-Return Cable Wiring
OPERATING INSTRUCTIONS
SOURCE SELECTION
The MM 8z is able to mix together four Sources. Each
Source is switchable between two line Inputs, one of which
may be switched to a Phono Input. The center OFF position
of the Source Input Select switch mutes it.
The ASSIGN switch for Source 1 in the PRE position
combines PH/LN 1 or LINE 2 with PH/LN 3 or LINE 4 for
the A Mix. Likewise, the ASSIGN switch for Source 4 in the
PRE position combines PH/LN 5 or LINE 6 with PH/LN 7 or
LINE 8 for the B Mix. These Mixes are routed to each side of
the Crossfader, A & B. Either ASSIGN switch in the POST
position routes Source 1 or 4 directly to the Master Level
control, and routes Source 2 or 3 through the Crossfader
before going to the Master Level control.
SOURCE EQUALIZATION
Each selected Source’s frequency spectrum can be
contoured with the Treble, Mid, and Bass controls. These are
intended to provide EQ between varying program material.
The Treble and Bass controls offer 15 dB of boost or cut; the
Mid control offers 8 dB of boost or cut. Positioning any
control to the “12 o’clock” position turns that equalization
band off.
SOURCE FADERS
The Source faders control the level of the selected Input.
They also provide a means to set relative levels for each Input
to A and B Mixes. Set the Source faders near their maximum
levels (0 dB) instead of increasing the gain later at the Master
Level control or power amp. You achieve optimum noise
performance by having the majority of the gain at the input
stages. Taking the least amount of gain at the output ensures
that the system doesn’t have to amplify the unavoidable noise
generated by the input buffers and summing amplifiers. Unity
gain for Line Inputs is achieved with the faders positioned at
the “0 dB” marking.
HEADPHONE SYSTEM
Depending on the position of the Pan control, a mix of
stereo Cue or stereo Master is heard through the headphones.
Fully counterclockwise, the
sum
of
selected
Cue Sources is
heard. This allows previewing of the full equalized Source
signal even while the fader is down. Clockwise rotation
increases the amount of Master signal. The Level control
adjusts the headphone output.
