PANASTEREO SP23 – Alignment with DOLBY CP55
16
2 – ALIGNMENT with DOLBY CP55
Equipment required: Dolby Cat.85C Pink Noise Card, Real Time Analyser (RTA)
1. SET UP REAL TIME ANALYSER
Set up a Real Time Analyser and position the
microphones in the auditorium.
2. PRE-SET SP23 OUTPUT LEVELS
Turn all four output trimmers on the SP23
anticlockwise until you feel a slight click.
3. SWITCH SP23 TO BYPASS
Switch the SP23 to bypass mode (Red Bypass
button IN).
4. SET THE CP55 SURROUND
EQUALISERS TO FLAT
On the CP55 Cat.441 card, turn the Treble
and Bass controls for both the Ls and Rs
channels to the middle of their rotation. Turn
the midrange cut control for both Ls and Rs
channels fully clockwise
5. INSTALL PINK NOISE CARD
Remove the Cat.150 Decoder card from the
CP55 sound processor and install the Cat.85C
pink noise generator into the slot provided.
6. SELECT “OPTICAL STEREO”
FORMAT
Select “Optical Stereo” on sound processor to
output pink noise to the auditorium.
7. SET PROCESSOR VOLUME TO “7”
Set the sound processor volume control to
level “7” and keep it there for all subsequent
adjustments.
8. CHECK SPL LEVELS ON ALL
CHANNELS
Check that the SPL levels for all of the
channels are correct (85dBC per channel). If
necessary, adjust the L, C and R, output level
trimmers on the Cat.242 B-chain card and/or
the Ls & Rs trimmers on the Cat.441 card for a
level of 85dBC from each channel.
9.
SELECT “DIGITAL” FORMAT
Select the sound processor to DIGITAL
format. Check that the red “DECODE-ON”
LED is illuminated on the SP23
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