McIntosh MSD4, Руководство пользователя

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14
System Level Calibration
The MSD4 includes a built-in test signal generator to per-
form System Level Calibration. A properly calibrated sur-
round sound system should have all channel levels adjusted
initially for similar volume in the listening area. This en-
sures that multi channel sound tracks will be reproduced
with optimum realism. Individual channel levels from an
actual sound track usually change widely on a continuous
basis. Proper System Calibration sets all channels to the
correct starting reference level.
NOTE: When the MSD4 is used in a system with the C39 or
MX130, it is recommended that level calibration be done
at the A/V Control Center. Refer to the Control Center
Owner’s Manual for details.
The built-in calibration should be used primarily
when the MSD4 is used in a stand alone system. When in
the System Calibration mode, it is most convenient to
make level adjustments from the listening area with the
optional HR34/HR39/HR130 Remote Control. The
MSD4 VOLUME control can also be used to adjust
levels. A sound level pressure meter may be used to
obtain a more accurate calibration. Refer to Figures 4
and 5 for the followings steps.
System Level Calibration
Automatic System Calibration
1. Set the rear panel SYSTEM CALIBRATION switch to
AUTO.
2. Adjust the MSD4 volume control until the display reads
70. This is an initial reference setting to ensure that the
test signals will be adequately loud to perform the level
calibration.
3. Press the SYS CAL push-button once to start System
Calibration. You will hear the test signal from the left
front speaker for 2 seconds. The test signal will then
cycle through all six channels continuously in 2 second
intervals, clockwise starting with Left Front, Center,
Right Front, Right Surround, Left Surround and
Subwoofer. The MSD4 DELAY/VOLUME display will
read “0” for each channel before any adjustments are
performed.
NOTE: The front panel CHANNEL STATUS LED’s will light to
indicate which channel is reproducing the test signal.
4. While seated in the listening area, note the volume lev-
els of the test signal from each of the channels as the
test signal switches. If you determine that the test signal
volume is louder or softer in any of the channels, the
levels should be adjusted so you hear essentially the
same test signal volume from all of the channels. The
left front channel volume level can serve as a reference.
5. Make channel level calibration adjustments with the op-
tional HR34/HR39/HR130 Remote Control Surround
Up and Down push-buttons from the listening area. You
can also use the MSD4 volume control. If an adjust-
ment is made on a channel, there is an additional 2 sec-
ond time interval on that channel before the system
switches the test signal to the next channel. As a level is
changed, the DELAY/VOLUME display instantly
changes to indicate the calibration level change in dB.
If the level is increased, the display shows plus num-
are sent equally to each of the five remaining channels. If
the SUBWOOF switch is OFF and there are no large full
range speakers in the system, you will not hear the extreme
low frequencies. When no subwoofer is connected and
LARGE (Full Range) Loudspeakers are connected the
Front Left and Right Channels, the LFE (Low Frequency
Effects) are directed to them.
EXAMPLE: If you are using McIntosh speakers, HT-1 or SL-6,
HT-2 or SL-1, HT-3, HT-4, use the following settings.
Set FRONT to SMALL.
Set CENTER to SMALL.
Set SURR to SMALL
Set SUBWOOF to ON.
Reset of Microprocessors
In the event that the controls of the MSD4 stop functioning,
there is a user reset function built in. While the MSD4 is on
depress and hold in the STANDBY/ON/RESET push button
for five seconds, this will reset the MSD4’s microproces-
sors.
NOTE: The above condition is usually caused by either
interruptions in AC power and/or major changes in
voltage.
Figure 4
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