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Type I Noise Reduction 911

Type I Noise Reduction 911; dbx Inc.; Waltham MA (ID = 2103064) Misc Type I Noise Reduction 911; dbx Inc.; Waltham MA (ID = 2103066) Misc
Type I Noise Reduction 911; dbx Inc.; Waltham MA (ID = 2103068) Misc
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Type I Noise Reduction 911; dbx Inc.; Waltham MA (ID = 2103064) Misc
dbx Inc.; Waltham MA: Type I Noise Reduction 911 [Misc] ID = 2103064 458x1400
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For model Type I Noise Reduction 911, dbx Inc.; Waltham (MA)
Country:  United States of America (USA)
Manufacturer / Brand:  dbx Inc.; Waltham (MA)
Year: 1990 ?? Category: Miscellaneous (Other, Various) - see notes
Main principle Audio-Amplification
Wave bands - without
Power type and voltage Powered by external power supply or a main unit.
Loudspeaker - For headphones or amp.
Power out
from Model: Type I Noise Reduction 911 - dbx Inc.; Waltham MA
Material Various materials
Shape Rack
Dimensions (WHD) 38 x 133 x 262 mm / 1.5 x 5.2 x 10.3 inch

The 911 incorporates one channel of encode and one channel of decode circuitry in the dbx® Type I format. The Type I system doubles (up to a maximum of 115 dB) the dynamic range of the storage or transmission medium. This is achieved through compressing the signal by a 2:1 ratio during record then expanding the signal 1:2 with a precisely complementary deemphasis during playback. The companding is linear over a 100 dB range. It requires no pilot tones or special calibration. 

Type I provides best results when used with transmission or storage media exhibiting flat frequency response (±1 dB 20 Hz - 20 kHz) - typically open reel recorders running at 15 or 30 ips, or digital media. The signal's dynamic range is cut in half, with the hottest levels considerably reduced and the softest passages boosted. On decoding, the signal is precisely expanded back, and the original dynamic range of the program is retrieved without hiss, saturation distortion, or degradation of frequency response. 

Industry standard Type I noise reduction.
Greater than 40dB improvement in dynamic range for typical systems.
Front panel adjustable to match facility levels from -12 to +16dBu.
Hardwire bypass switch.

Used in a DBX 900 rack adapter. The rack adapter can hold up to 9 modules, and provides DC power to each module.

Net weight (2.2 lb = 1 kg) 0.3 kg / 0 lb 10.6 oz (0.661 lb)

Model page created by Bartosz Szwed. See "Data change" for further contributors.

All listed radios etc. from dbx Inc.; Waltham (MA)
Here you find 23 models, 19 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.