9
IV. CHECKOUT AND ADJUSTMENT PROCEDURE
A SPL meter and the DTS technician’s kit (not included with the DTS system) are required to complete the
checkout and adjustment procedure. The DTS technician’s kit consists of
:
* 6-track
SETUP
Disc, DS1
Used to adjust DTS-6D levels, check automatic default switching, and verify operation of the drives.
* “Buzz and Bill Show” Disc
Used to test the DTS system.
Must be dated Feb. 1, 1999 and have SMPTE RP200 standard.
* Demo Film
Used with the “Buzz and Bill Show” disc.
* Empirical Test Disc
Used to test the theater’s sound system.
Must be dated June 7, 1997
.
* DTS trimpot tweeker
* DTS T-shirt
4.1
Setting SPL (Sound Pressure Level)
The theater sound processor’s B-chain must be checked and adjusted before the DTS system is installed.
Any
changes to the B-chain will effect the output levels on the DTS system
.
Introduction
The output levels are factory preset at 250mV rms. This nominal level will insure that speakers will not be
overdriven during the setup procedure. If the DTS-6D processor you are about to install has come from another
installation, be sure to turn down the level trimpots (counter-clockwise) before proceeding to guard against
accidental overdriving of speakers. During the setup procedure, the output levels should be adjusted for correct
SPL levels
in the theater
.
Subwoofer
The DTS subwoofer output level ranges from 20Hz to 80Hz, up to 27dB above reference (85dB).
You must
observe your subwoofer’s specifications to avoid damage to the speaker.
If a subwoofer is driven below its
cutoff frequency, its driver(s) may become unloaded. When unloaded, the voice coil can travel outside of the
magnet’s gap, thus overheating or causing mechanical damage to the speaker. A high pass filter should be
installed on those speakers with high cutoff frequencies. Contact your speaker manufacturer for more
information.
•
DTS Subwoofer in the Surrounds?
The DTS subwoofer signal is derived by filtering out the surround signals from 80Hz and below. That signal is
put on its own “subwoofer” output on DTS player. You may verify this while EQ-ing a theater. Insert the
DTS Setup disc into the player and play the subwoofer pink noise off the disc. Turn off the subwoofer speaker
and look at the pattern on the RTA. You’ll see a dramatic roll-off at 80Hz. It is normal to hear DTS
subwoofer pink noise, above 80Hz, in the surrounds.
Setting DTS-6D Levels (see Figure 4)
Turn power on and load the
SETUP DISC
-- use RevC or DS1 to set levels
.
After a delay of about 40 seconds,
the
SYSTEM
light will blink. Then the
DIGITAL
light and the
CD-ROM
light will illuminate and the cinema
processor will change to digital format. Tone should be heard in the theater.
Open the screen curtains. Go into the theater to make SPL readings in the rear third and just off-center of the
room
. Do not simply point the sound pressure level meter out of the port hole window.
This will not give
you accurate SPL readings. See the next page for SPL settings.
Summary of Contents for DTS-6D
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