Accurate THX Volume calibration requires the use of a calibrated sound level meter
positioned in the listening area at seated ear height. The meter is necessary to set
the acoustic sound levels from each loudspeaker to 75dB as specified by the Home
THX Audio standards.
MANUAL CHANNEL CYCLING FOR CINEMA 2
HOME THX AUDIO SURROUND LEVEL CALIBRATION
1. Set the C39 LISTEN Selector switch to the LV (Laser Video Disc Player) position.
2. Set the MODE Switch to CINEMA 2.
3. Adjust the C39 Volume control until the front panel Volume Level Indicator reads
"44". This is the recommended Home THX Audio starting reference volume setting.
This volume setting produces the required audio output when connected to a Home THX
Audio licensed Mcintosh MC7106 power amplifier driving Mcintosh HT Series loudspeakers.
4. Set the rear panel SURROUND CALIBRATE switch to MANUAL.
5. Place the sound level meter in the primary listening area. Set the meter for flat response
or C weighting, slow mode if available, and to an appropriate range for reading a sound pressure
level of 75dB.
6. Press the SYS CAL, (SUR CAL) Surround calibration pushbutton. This activates the built-in
noise generator and feeds it first to the LEFT FRONT channel to start the level calibration
process. Each further press of the SYS CAL, (SUR CAL) pushbutton feeds the noise generator
signal to the other five channels in the following order: CENTER, RIGHT FRONT, RIGHT SUR-
ROUND, LEFT SURROUND and finally the SUBWOOFER.
Adjust the levels of each of the six individual channels with the front panel UP ( ) or DOWN
( ) SURR LEVEL, (SUR CAL) pushbuttons until the sound level meter reads as close as possi-
ble to 75dB in the listening area.
Any changes made in channel calibration levels will be read as a TRIM number on the
front panel % VOLUME indicator. Trim numbers will indicate + (Plus) or - (Minus) from 0
to 19. You may repeat the calibration process as many times as desired until you are satisfied
with the results.
(For future reference, list the final calibration trim numbers in the space provided in this
manual. If the C39 AC power cord is disconnected from the AC power line, or AC power is
interrupted, the backup power supply will turn off and calibration memory will be lost. The
calibration process must then be repeated.)
After the last channel, the Subwoofer, has been calibrated, press the SYS CAL, (SUR
CAL) pushbutton again to exit the calibration mode.
You can also edit or cancel the manual calibration mode at any time by adjusting
the front panel VOLUME control or pushing one of the remote controller VOLUME
pushbuttons.
The dimensions and shape of the listening room can affect bass frequencies that are
reproduced by a subwoofer. You may have to experiment with different locations for the sub-
woofer until you find one that works best in your room.
If the front panel VOLUME control is adjusted, or the remote controller VOLUME
buttons are pushed at any time during the calibration procedure, the calibration func-
tion will be canceled.
27
MclNTOSH
HOME THEATER
SURROUND
SOUND
VOLUME LEVEL
CALIBRATION
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