Sony DFP-R3000 Quick Start Manual page 14

individual bands of your RTA will each be at about 70 dB SPL. The left and right
surround cabinet groups should each be set for 82 dBC.
Note: It is better to achieve this result with an adjustment of amplifier gain than by
using a Channel Level Trim, and when using a Channel Level Trim, it is better to
preserve full headroom by using attenuation (cut) instead of gain (boost). Avoid
settings of the Channel Level Trim bars to values above 0.0 dB.
Adjusting the subwoofer equalizer is especially difficult and benefits from experience
with the particular cabinet model used. Use as little EQ as possible and allow your RTA
display extra time to settle between adjustments. Aim for a smooth, rather than
extended, response. Note that the higher frequencies are rolled off by the subwoofer
low pass filter, whose frequency is shown below the graphic display and is indicated by
the vertical yellow line (use 330 Hz for this step and reduce it later).
Recognize that the SDDS (and other digital formats) subwoofer is an effects channel
that delivers low frequency sounds designed to enhance certain elements of a particular
film. The analog subwoofer is derived from the L,C,R channels and is intended to
compensate for limitations of the screen speakers being used; modern, full-range
screen loudspeakers may need little or no analog subwoofer supplementation.
13. To adjust the Subwoofer Level Trim, the SDDS Preset must be made the active
preset.
40 63 100 160 250 400
Center channel loudspeaker response
630 1K 1.6K 2.5K 4K 6.3K 10K 16K
13. To set the equalization for the
subwoofer loudspeaker, press F6 to
bring up the 2-band parametric
equalizer. Verify that sound is coming
from the subwoofer loudspeaker
cabinet.
Now use the SDDS SW Offset slider
control to achieve 10 dB of in-band gain
of the subwoofer's bands on your real
time analyzer (RTA) compared to the
previously calibrated Center speaker's
bands in the region of its flat frequency
response.
40 63 100 160 250 400 630
Digital subwoofer (LFE) channel response
10dB higher SPL
1K 1.6K 2.5K 4K 6.3K 10K 16K