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returns to indicate the Source Selection and Volume
Level.
HEADPHONE HXD
When headphones are connected to the MA8900 Front
Panel Jack, an additional TRIM function becomes
available. McIntosh's HXD brings the acoustical depth
and spatiality of music normally heard with loud-
speakers, to your headphones. The default setting is
HXD On. To switch HXD Off perform the following:
1. Momentarily press the INPUT Control, then rotate
it to select "HEADPHONE HXD, On". Refer to
figure 69.
HEADPHONES HXD
On
Figure 69
2. To deactivate the HXD Mode rotate the VOL-
UME Adjust Control until the Front Panel Display
indicates "HEADPHONE HXD, Off". Refer to
figure 70.
HEADPHONES HXD
Off
Figure 70
Equalizer
Press the Front Panel EQUALIZER Push-button to
activate the MA8900 Equalizer Control Circuitry for
the currently selected Input Source. The LED above
the EQUALIZER Push-button will illuminate. Re-
fer to figure 50. The MA8900 remembers for each
selected Input whether the Equalizer Control Circuitry
is activated or deactivated. To deactivate the Equal-
izer 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.
2. The EQUALIZER can also be accessed by the
TRIM Function, refer to page 25.
Trim
Press the Front Panel INPUT/TRIM Control to acti-
vate the MA8900 Trim Functions. Rotate the Front
Panel INPUT/Trim Control to select the desired Trim
Function and then rotate the VOLUME/Adjust Con-
trol 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. Approxi-
mately 5 seconds after Trim Function Selection and/or
adjustments have stopped, the MA8900 will switch off
the Trim Mode.
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 func-
tion. 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.
COAX 1
48kHz
Figure 71
Pressing the Mute Push-button a second time
or adjusting the volume control will un-mute the
MA8900.
Headphones Jack
Connect a pair of dynamic headphones to the Head-
phones Jack with a 1/4" (0.635cm) stereo phone type
How to Operate the MA8900, con't
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 imped-
ances ranging from 100 to 600 ohms.
Power Output Meters
The MA8900 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.
Power Guard
During normal operation, the Front Panel Power
Guard Indicators will momentarily illuminate during
MUTE
peaks in the audio signals. In the event the MA8900
over heats, due to improper ventilation, high ambient
temperature and/or impedance mismatch, the inter-
nal protection circuits will activate. The Front Panel
Power Guard Indicators will continuously illuminate
and the audio will be muted. When the MA8900 has
returned to a safe operating temperature, normal op-
eration will resume.
Figure 72
27
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