dbx 900 Series Signal Processing System User Manual

9 0 0
M O D U
S E R I E
®
A Harman International Company
8760 S. Sandy Pkwy.
Sandy, Utah 84070
Phone (801) 568-7660
Fax (801) 568-7662
Int’l Phone (219) 462-0938
Int’l Fax (219) 462-4596
[email protected]
http://www.dbxpro.com
L A R
S
The 900 Series is a modular signal processing system that eliminates redundant packaging, saves rack space and provides exceptional flexibility and serviceability. The F900A mainframe can accommodate up to 9 modules, and the FS900
miniframe can accommodate one or two modules mounted horizontally. Some of the many applications of the 900 series
products include: music production and sound reinforcement, TV and radio production, mobile and theatrical production
and disc mastering.
F 900 A
The F900A is the foundation for creating a customized “audio
toolbox.” It holds up to 9 dbx 900 series modules in a 3U rack
space. Standard barrier strips provide access to all input and
output connections. To ensure reliability and consistent performance under the most demanding conditions, all internal connections to modules are made via double-sided, gold, bifurcated
contacts.
FS 900
The compact, cost-effective version of the F900A, the FS900
Miniframe accommodates two 900 series modules in a 1U rack
space. XLR connectors are provided for all input and output
connections. The unit is built to the same exacting standards as
the F900A.
900 SERIES
MAINFRAME
Specifications:
Power Requirements:
DC Regulated Output:
Weight:
Shipping Weight:
Dimensions:
90-130 VAC, or (as ordered) 200-250
VAC; 50/60 Hz, 100 W
±15 V at 1.0 A; ±24 V at 0.5 A
17 lbs. (7.7 Kg)
24 lbs. (10.9 Kg)
5 1/4” (13.3 cm) H x 19” (48.3 cm) W x
13” (33 cm) D
900 SERIES
MINIFRAME
Specifications:
Power Requirements:
DC Regulated Output:
Weight:
Shipping Weight:
Dimensions:
90-130 VAC, or (as ordered) 200-250
VAC; 50/60 Hz, 100 W
±5 V at 1.0 A; ±24 V at 0.5 A
8 lbs. (3.6 Kg)
13 lbs. (5.9 Kg)
1 3/4” (4.5 cm) H x 19” (48.3 cm) W x 13”
(33 cm) D
903
®
902
DE-ESSER
LIMITER
The 903 also uses dbx’s patented
OverEasy® soft-knee threshold for a smooth
onset of compression.
Rear panel access to the the RMS detector
allows the compressor to be triggered by
signals other than the audio input. Negative
compression ratios are also available for
special effects.
Using patented dbx® sibilance detection circuitry, the 902 compares the RMS energy of
signals above and below a specified
crossover point to precisely detect undesirable sibilance.
Features:
Features:
• Two or more 903 modules may be strapped
together for stereo or multichannel operation
• Continuously variable compression ratio from 1:1
through ∞:1 to -1:1
• Infinity+™ (Negative) compression
• Expanded scale LED metering
• External detector input
• Hardwire bypass switch
• Gain reduction adjustable from 0 to -20 dB
• Two gain reduction modes (Broadband and HF
Only)
• No need to set a threshold for de-essing
• Two 902 modules may be strapped together for
stereo operation
• Hardwire bypass switch
Specifications:
Specifications:
Frequency Response:
Input:
Frequency Response:
Input:
Indicators:
Metering:
/
Equivalent to the stand-alone dbx 160XT,
the 903’s features make it possible to
achieve large amounts of compression without undesirable side effects. The 903 uses
patented, true RMS detection to provide
audibly superior compression and limiting.
The industry standard 902 de-esser’s unique
features make it possible to achieve the
desired amount of de-essing, regardless of
variations in signal level.
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Controls:
COMPRESSOR
20 Hz - 20 kHz, ±0.5 dB
Balanced: 25 kΩ
Unbalanced: 18.5 kΩ
+24 dBu
Unbalanced: 22 Ω
+24 dBu into 600 Ω
<0.02% @1 kHz
106 dB
De-esser in/out Switch, HF Mode Switch, Frequency Adjust Knob, Range
Adjust Knob
Input: Red, HF Only: Red
10 Segment LED bargraph indicating Gain Reduction
20 Hz - 20 kHz, ±0.5 dB
Balanced: 25 kΩ
Unbalanced: 18.5 kΩ
+24 dBu
Unbalanced: 22 Ω
+24 dBu into 600 Ω
<0.02% @1 kHz, With any amount of compression
112 dB
1:1 through ∞:1 to -1:1
In/out Switch, Threshold Knob, Ratio Knob, Output Adjust
Knob
Input: Red, Infinity+™ Compression: Red
10 Segment LED bargraph indicating Gain Reduction
OverEasy®
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Compression Ratio:
Controls:
Indicators:
Metering:
Compression Characteristic:
904
The 904 is an expander gate using dbx’s OverEasy®
action for a smooth onset of gating. Attenuation limit,
attack and release rates and threshold are all
adjustable. This popular gate also features
Programmed Latch Mode which mutes a channel until
an above threshold signal is present. It then latches
open until reset.
The 904 is a very fast voltage controlled below threshold downward expander. It senses the level of an input
or keying signal and determines whether the level is
below threshold. If it is, the signal gets attenuated; if
not it passes at unity (0 dB) gain. The amount of signal
attenuation is a function of its own level and the 904’s
Attenuation, Limit, Ratio, and Threshold settings.
Features:
• Two modules can be strapped together for stereo operation
• Key input for frequency-tailored gating or gating of one instrument by another
• adjustable 0 to 60 dB attenuation
GATE
• Programmed latch mode
• Variable attack and release times
• Hardwire bypass switch
Specifications:
Frequency Response:
Input:
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Threshold Range:
Controls:
Indicators:
Metering:
20 Hz - 20 kHz, ±0.5 dB
Balanced: 25 kΩ
Unbalanced: 18.5 kΩ
+24 dBu
Unbalanced: 22 Ω
+24 dBu into 600 Ω
<0.02% @1 kHz
106 dB
-40 - +10 dBu, Variable
KEY Mode Switch, PLM Switch,
Gate In Switch, Attenuation Limit
Knob, Attack/Release Knob,
Threshold Knob, Ratio Knob
Input: Red, PLM: Green, Key:
Red
10 segment LED bargraph indicating Gain Reduction
929
HISS REDUCERª
The 929 provides two channels of single-ended noise
reduction for use with analog tape recorders, multiple
signal processors and noisy digital samplers and storage devices. The single Quieting control for each
channel can be rapidly adjusted for the hiss characteristics of a particular system
independent channels that may be strapped for operation
with noisy stereo sources.
Features:
• Stereo or dual mono operation
• Easily set for different program material
• Provides noise reduction in situations where Type I or Type II
encoding cannot be used
The 929’s patented circuitry gets rid of unwanted,
steady-state hiss, but preserves those high frequencies that add definition to sound.
Frequency Response:
Input:
The 929 provides significant noise reduction for
sources that have a steady noise floor. The 929 monitors the RMS energy in the hiss frequency band. If
any fluctuating energy is detected, it immediately
“opens up” as long as necessary to let the desired signal through.
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Controls:
Inputs on the 929 are balanced; outputs are unbalanced. Outputs can be changed to balanced operation
by moving two jumpers. Each module contains two
911
905
THREE BAND
PARAMETRIC EQUALIZER
The 905 provides flexible equalization in a
compact, high density format without sacrificing true, fully parametric operation of all
three filter bands.
The bands each offer control of frequency,
bandwidth (Q) and up to 15 dB of cut or
boost. Each of the filters can be independently switched from standard reciprocal
operation to “infinite notch” mode by simply
turning the cut/boost switch a click-stop past
maximum cut.
For shelving applications, the 905’s high
and low bands can be switched from
peak/dip to shelving operation at the front
panel
Features:
• A/B comparisons available by switch bypass
• Peak/dip and switchable notch mode on each
band
• Peak/shelf switching on high and low bands
• Overload sensing indicates clipping at any point
in the circuit
• Infinite notch switch on each band
Specifications:
Frequency Response:
Input:
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Controls:
Indicators:
20 Hz - 20 kHz, ±0.5 dB
Balanced: 25 kΩ
Unbalanced: 18.5 kΩ
+24 dBu
Unbalanced: 22 Ω
+24 dBu into 600 Ω
<0.03% @1 kHz, with any boost or cut
112 dB
Parametric EQ In/Out Switch, Symmetrical Shelving Switch (high and
low); For Each Band: Frequency Center Adjustment Knob, Boost/Cut
Knob, Q Adjustment Knob
Clip Light: Red, In/Out: Red, Gain:Red
®
®
Specifications:
20 Hz - 20 kHz, ±1 dB
Balanced: 30 kΩ
Unbalanced: 18.5 kΩ
+24 dBu
Balanced: 44 Ω
Unbalanced: 22 Ω
Balanced: +24 dBu into 600 Ω
Unbalanced: +23 dBu into 600 Ω
<0.03%
109 dB
Hiss Reducer In/Out Switch, Stereo Couple Switch
TYPE I NOISE
REDUCTION
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.
Features:
• Industry standard Type I noise reduction
• Greater than 40 dB improvement in dynamic range for typical systems
• Front panel adjustable to match facility levels from -12 to +16 dBu
• Hardwire bypass switch
Specifications:
Frequency Response:
Input:
Maximum Input Level:
Output:
Maximum Output Level:
THD:
Dynamic Range:
Controls:
30 Hz - 20 kHz, ±1 dB; 20 Hz, -1 dB
Balanced: 75 kΩ
Unbalanced: 50 kΩ
+23 dBu
Balanced: 44 Ω
Unbalanced: 22 Ω
Balanced: +24 dBu into 600 Ω
Unbalanced: +23 dBu into 600 Ω
<0.1% 100 Hz - 20 kHz; <0.5% below 100 Hz
116 dB
NR In/Out Switch, Record Switch, Play Switch
941A
942A
TYPE II NOISE REDUCTION
The 941A encoder and the 942A
decode modules provide more than
40 dB of additional dynamic range for
typical limited bandwidth media such
as cart machines, telephone/PPT
lines, videotape audio tracks and low
bandwidth digital systems.
Features:
Patented RMS detection circuitry
makes the system virtually immune to
phase shift related tracking problems.
The 941A incorporates two channels
of Type II encoding, while the 942A
incorporates two channels of Type II
decoding. A typical application of multiple 942As is in the on air studio
where outputs of multiple decks are
decoded.
Specifications:
Calibration trims are accessible at the
front panel to allow readjustment to
custom studio levels.
THD:
• Separate encode and decode modules for
production and on air rooms
• Provides greater than 40 dB improvement
in dynamic range for typical systems
• Front panel adjustable to match facility
• Hardwire bypass on all inputs and outputs
Frequency Response:
Input:
Maximum Input Level:
Output:
Maximum Output Level:
Dynamic Range:
Controls:
F 900 A
900 SERIES MAINFRAME
BACK PANEL
FS 900
900 SERIES MINIFRAME
BACK PANEL
40 Hz - 20 kHz, ±0.5 dB;
30 Hz, -2 dB
Balanced: 75 k Ω
Unbalanced: 50 k Ω
+23 dBu
Balanced: 44 Ω
Unbalanced: 22 Ω
Balanced: +24 dBu into
600 Ω
Unbalanced: +23 dBu into
600 Ω
<0.1% 100 Hz - 20 kHz;
<0.5% below 100 Hz
116 dB
Decode In/Out Switch
®
A Harman International Company
®
8760 S. Sandy Pkwy.
Sandy, Utah 84070
Phone (801) 568-7660
Fax (801) 568-7662
Int’l Phone (219) 462-0938
Int’l Fax (219) 462-4596
[email protected]
http://www.dbxpro.com
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