30
separate amplifier instead of the MA12000 built-in
Power Amplifier. Connect the Loudspeakers to the
separate Power Amplifier and remove the McIntosh
Jumpers that are located between the OUTPUTS 1
Jacks and the PWR AMP INPUT Jacks. Refer to
figure 73.
Note: The McIntosh Jumpers must be connected,
between the above mentioned jacks, when the
MA12000 Internal Power Amplifier is to be used.
The second way is to use both a separate Power
Amplifier and the MA12000 built-in Power Amplifier.
Connect one pair of Loudspeakers to the separate
Power Amplifier and the second pair to the MA12000.
Refer to the MA12000 Output Connection Diagrams
located on the separate folded sheet “
Mc2B
” and
figure 74.
Note: The MA12000 VOLUME Control will affect the sound
level of all the Loudspeakers.
Using Output 2
The MA12000 has provisions for connecting an
external Power Amplifier (to drive Loudspeakers
in another room) and an external sensor for remote
Pressing the Mute Push-button a second time or
adjusting the volume control will un-mute the
MA12000.
Headphones Jack
Connect a pair of dynamic headphones to the
Headphone Jack with a 1/4” (0.635cm) stereo phone
type plug for private listening. The default setting is
for Output Connections 1 and 2 to automatically mute.
For additional Information refer to “HEADPHONE
HXD” on this page.
Note: The Headphone Output is optimized for
impedances ranging from 100 to 600 ohms.
Power Output Meters
The MA12000 Power Output Meters indicate the
power delivered to the Loudspeakers. Refer to figure
72.
The meters respond to all the musical information
being produced by the Amplifier. They indicate to an
accuracy of at least 95% of the power output with only
a single cycle of a 2,000Hz tone burst.
Using a Separate Power Amplifier
There are two different ways to use a separate power
amplifier with a MA12000. The first way is to use the
Equalizer
Press the Front Panel EQUALIZER Push-button to
activate the MA12000 Equalizer Control Circuitry
for the currently selected Input Source. The LED
above the EQUALIZER Push-button will illuminate.
The MA12000 remembers for each selected Input
whether the Equalizer Control Circuitry is activated
or deactivated. To deactivate the Equalizer Control
Circuitry for the currently selected Input Source, press
the EQUALIZER Push-button and the LED above the
push-button will extinguish.
Note: 1. The audio signal present at the FIXED OUTPUT
Jacks is unaffected by the Equalizer Circuitry.
Trim
Press the Front Panel INPUT/TRIM Control to
activate the MA12000 Trim Functions. Rotate
the Front Panel INPUT/Trim Control to select the
desired Trim Function and then rotate the VOLUME/
Adjust Control to vary or make changes. Refer to
figure 50. The Remote Control TRIM and LEVEL
UP and LEVEL DOWN Push-buttons may also be
used. Approximately 5 seconds after Trim Function
Selection and/or adjustments have stopped, the the
Trim Mode switch off.
Mute
Press the MUTE Push-button to Mute the Audio in
Output 1 (Loudspeakers), Output 2 and Headphones.
The audio signals present at the FIXED OUTPUT
Jacks are not effected by activating the mute function.
The Front Panel Display will indicate the Source
Name and with the word MUTE in place of the actual
volume setting. Refer to figure 71.
Figure 71
COAX 1 MUTE
48kHz
Figure 72
35 350
3.5
.
35
P O W E R O U T P U T
- 50
- 30
D E C I B E L S
WAT T S
- 40
-20
-10
0
3.5
m
35
m
70
0
35 350
3.5
.
35
P O W E R O U T P U T
- 50
- 30
D E C I B E L S
WAT T S
- 40
-20
-10
0
3.5
m
35
m
70
0
Figure 73
Jumpers
Figure 74
Jumpers Removed
