Front-Panel Controls and Indicators
Individual for each channel
Threshold:
Sets level at which signals receive most boost;
adjustable from 60 to 40 dB below the nominal
operating level; five-LED meter array indicates
when processor is most active; input clip LED
Equalization:
Three-band filter section
Low-to-Mid crossover frequency adjustable from
75 Hz to 1 kHz, center detent at 300 Hz
Mid-to-High crossover frequency adjustable from
500 Hz to 8 kHz, center detent at 2 kHz
Boost controls for each band; greater than 20 dB
with crossover controls set to their detent positions
Three-position EQ switch selects one
of the following modes: In—processing active; main
path and side chain added within the unit; Side
Chain—side chain signal only, to ease adjustment
of the EQ controls or allow external manipulation;
Out—all processing bypassed (including Source NR)
Source NR:
Sliding band noise reduction section
reduces noise present in the input signal;
adjustable 0–12 dB
Filters:
Selectable; prevent unwanted signals from
entering the low-level processing stage
Highpass: 100, 200 Hz
Lowpass: 4, 8 kHz
Output:
Sets overall channel gain; adjustable from –14 to
+6 dB (with processing out). Clip LED will light to
indicate clipping in the output stage.
Stereo Link:
Switch combines dynamic processor control
signals to prevent image-shifting with stereo
signals; EQ Crossover and Boost controls remain
independent even when processors are linked
Operating Levels
Switch on rear of unit selects between High
(+4 dBu) and Low (–6 dBu) line-level operation
Inputs
XLR type connectors, balanced, floating;
impedance: 10 kΩ. Maximum Level: High:
+24 dBu; Low: +14 dBu
Outputs
XLR type connectors, balanced, floating;
impedance: 20Ω. Maximum Level: +26 dBu
balanced, +21 dBu unbalanced (irrespective of the
position of the High/Low switch); either leg of the
output may be grounded for unbalanced operation
with no loss of level
Power Requirements
User-selected voltage nominally 100,
120, 220, 240 VAC 36 W approximate
Dimensions and Weight
1-U rackmount: 44 × 483 × 248 mm
(1.75 × 19 × 9.76 inches); further 65 mm
(2.5 inches) depth required for the
XLR connectors
Net: 5.3 kg (11.6 lb) approximate
Environmental Conditions
0° to 40°C (32° to 104°F)
Warranty
One-year limited, parts and labor; see disclaimer.
Specifications subject to change without notice.
Dolby 740 Spectral Processor
Disclaimer of Warranties
Equipment manufactured by Dolby Laboratories is warranted against
defects in materials and workmanship for a period of one year from the
date of purchase. There are no other express or implied warranties and
no warranty of merchantability or fitness for a particular purpose, or of
noninfringement of third-party rights (including, but not limited to,
copyright and patent rights).
Limitation of Liability
It is understood and agreed that Dolby Laboratories’ liability whether
in contract, in tort, under any warranty, in negligence, or otherwise
shall not exceed the cost of repair or replacement of the defective
components or accused infringing devices, and under no circumstances
shall Dolby Laboratories be liable for incidental, special, direct, indirect,
or consequential damages (including, but not limited to, damage to
software or recorded audio or visual material), cost of defense, or loss of
use, revenue, or profit even if Dolby Laboratories or its agents have been
advised, orally or in writing, of the possibility of such damages.
Dolby and the double-D symbol are trademarks of Dolby Laboratories.
© 2004 Dolby Laboratories, Inc. All rights reserved. S04/13656/15267
Part No. 91313 Issue 6
Dolby Laboratories, Inc. 100 Potrero Avenue, San Francisco, CA 94103-4813 Telephone 415-558-0200 Fax 415-863-1373
Wootton Bassett, Wiltshire SN4 8QJ, England Telephone (44) 1793-842100 Fax (44) 1793-842101 www.dolby.com