DOLBY NOISE REDUCTION
430SPECIFICATIONS
Dolby noise reduction is a family of signal processes that reduce the noise inherent in analog recording media, without affecting the sound being recorded. While they differ in perfor- mance and details of operation, all Dolby NR systems are complementary processes that first encode the music when it is recorded, then decode it when it is played back. They also treat soft signals separately from loud ones, and vary the NR action with frequency to avoid the side effects typical of other systems.
Dolby
Dolby SR (spectral recording), intro- duced in 1986, was designed not only to provide more noise reduction than
Signal Processing
Independent low- and
Signal Connection
Operating Controls
Operating controls for each channel of processing are mounted on Cat. No. 429 Remote Control module
Level: rotary control varies signal level in processing circuitry over a ±6 dB range without changing overall gain of unit
In/out:
HF & LF: fader controls set attenuation of unwanted
Signal Levels
Nominal input and output level +4 dBr1
Input Circuits
Electronically balanced, 20 kΩ input impedance, substantially resistive; common mode rejection better than 55 dB, 50 Hz to 10 kHz; maximum input level +27 dBr balanced, +21 dBr unbalanced
Output Circuits
Electronically balanced, approximately 20Ω output impedance; output balance better than 1 dB into a symmetrical 600Ω load; output float2 better than
Frequency Response
±1 dB 20 Hz to 20 kHz with LF and HF controls set to 0
Crosstalk
Channel to channel within a single frame: better than
Power Line Input
240 V
Size
Processor and power supply/control units: 44 ⋅ 483
mm(standard 1.75 ⋅ 19 inches rack mounting ); maximum projection behind mounting surface:
330 mm (13 inches) including connectors; remote control panels: 150 mm x 39.5 mm (5.91 ⋅ 1.56 inches ); maximum projection behind control surface: 100 mm (3.94 inches) including connec- tors; may be
Weight
Model Weights (including remotes):
17.8 kg (39.2 lb);
Accessories
430SU1:
430SU2:
430SK1:
Cat. No. 428: remote housing for up to three Cat. No. 429 remote controls.
Regulatory Notices
US: This unit is UL listed.
Europe: The 230 Volt unit complies with the requirements of Low Voltage Directive 73/23/EEC.
Warranty
One-year limited, parts and labor
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 partic- ular purpose.
LIMITATION OF LIABILITY: It is understood and agreed that Dolby Laboratories’ liability whether in con- tract,in tort,under any warranty,in neg- ligence or otherwise shall not exceed the cost of repair or replacement of the defective components and under no cir- cumstances shall Dolby Laboratories be liable for incidental,special, direct, indi- rect or consequential damages (includ- ing but not limited to damage to soft- ware or recorded audio or visual mater- ial),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.
10 dBr = 0.775 mV
2Output float is the level across a balanced load relative to an interfering signal injected at one end of the load
Specifications subject to change without notice.
Dolby and the
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