Sony DFP-R3000 Quick Start Manual page 13

10. Now select each output channel in succession (use the Function keys), confirm that
the noise sound is coming from the correct loudspeaker, and adjust the channel's
equalization and level. Start by adjusting the equipment between the System Outputs of
the DFP-D2500 and the loudspeakers to achieve about 85 dBC SPL in each screen
loudspeaker, measured individually (82 dBC for the surround channels). This equipment
may include crossovers and power amplifiers from a number of manufacturers so
specific instructions cannot be given here.
11. Adjust the graphic equalizer to achieve the "X" curve of SMPTE 202M, or other
frequency response that has been established for your theatre. Do this for each output
channel and loudspeaker, except the subwoofer.
Setting the graphic equalizer for best results requires skill and experience, but a few
general points can be made. Make small adjustments and let the RTA display settle
down after each adjustment. Cutting EQ is always better than boosting EQ. A band
with substantial boost next to a band with substantial cut indicates problems that aren't
appropriate for EQ to correct; try to end up with a smooth equalizer setting using as
little EQ as possible and no more than a few dB difference between adjacent bands. Use
even less EQ on the surround loudspeakers. The screen speakers should all have
approx. the same EQ settings (if they are the same cabinet type); if they aren't close,
there may be problems that EQ should not be used to address.
Don't boost low bands in an attempt to extend the low frequency response; that is
mainly determined by the cabinet design. Remember that you can only adjust for the
sound that comes directly from the loudspeakers to the measurement microphone; you
cannot do much about the sound that is influenced by the auditorium acoustics or
resonances and you should avoid the temptation to try to do so.
12. When all loudspeakers except the subwoofer have been EQ'd, make a wide-band
adjustment in the equipment between the DFP-D2500 and each of the loudspeakers
(such as with a power amplifier gain control) to achieve 85 dBC SPL from each screen
loudspeaker. This is a wide-band sound pressure measurement; at this point, the
8. Open the Master DFP-2.5K
Settings screen by selecting Master
DFP-D2500 under the Master option
in the main screen menu bar.
9. Ensure that the Master Volume is
set to 0.0 dB. Select the appropriate
output level for the DFP-D2500; this is
the absolute signal level that will
correspond to the -20 dBfs reference
point. In most cases you should chose –
10 dBu (145 mV).
Use your real time analyzer (RTA) to
check the SPL in the theatre and ensure
that it is in the right range when the
Master Volume is 0.0 dB.