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5
MIC LINE AMPLIFIER
Controls and Connectors
Front Panel
1
POWER switch and indicator
This switch turns the power on or off. Press the switch
in to turn it on (the Power indicator lights).
To avoid loud noise from the speakers, first
turn on the power to the connected devices
that are closest to the sound source.
Example: Sound source
➞
MLA8
➞
Mixer
➞
Power
amplifier
To turn off the power to the system, reverse
the order described above.
2
[ ] buttons
This button switches the high pass filter (HPF) on or
off for each channel, cutting frequencies below 80Hz.
Press the button in to turn HPF on.
3
[26dB] buttons
Pressing this button turns on the attenuator for each
channel, attenuating the input signal level by 26dB.
4 [+48V] switches
This switch supplies phantom power to pins 2 and 3 of
the XLR-type input connectors on each channel. Turn this
switch on if you are using condenser microphones
requiring external +48V power with the INPUT
(XLR) connector.
• To avoid damage to speakers, be sure to
turn off any connected amplifier (or
powered speakers) before turning these
switches on or off.
• Be sure to leave these switches off if you do
not need phantom power. If you connect to
an unbalanced device or to an ungrounded
transformer while these switches are on, it
may result in humming noise or even
damage.
5 PEAK indicators
Light up in red when the signal level via the channel’s
GAIN control comes within 3dB of the clipping level.
6 SIGNAL indicators
Light up in green when the signal level via the
channel’s GAIN control reaches within 10dB of the
nominal (rated) level.
7 GAIN controls
Adjust the gain applied to the input signal level.
If level is low (e.g., mic input) turn the [26dB] button
off, and adjust the input levels from -60dBu to -16dBu.
If the signal level is high (e.g., line input), turn the
[26dB] button on, and adjust the input levels from
-34dBu to +10dBu.
n To get the best balance between the S/N ratio
and the dynamic range, adjust the gain so that
the Peak indicator comes on just as the signal
approaches its maximum level.
-16
+10 -34
-60
GAIN
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
SIGNAL
PEAK
OFF ON
+48V
8080
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
1
23
45678
MIC LINE AMPLIFIER
POWER
ON / OFF
26dB 26dB26dB26dB26dB26dB26dB26dB
-16
+10 -34
-60
GAIN
SIGNAL
PEAK
OFF ON
+48V
80
26dB
1
2
3
4
5
6
7
80
Security cover
This device has two holes for installing the
protective cover on each side of the front panel
(size: M3, distance between holes: 423mm). To
prevent operation errors and inadvertent changes,
you can attach a user-made cover to the front
panel. Yamaha, however, does not make a security
cover for the device.
If you attach such a cover yourself, make sure that
the securing screws do not protrude inside the front
panel by more than 15mm. To avoid the cover
touching the knob, be sure to leave a space of
about 20mm between the front panel and the cover.