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DBX 900 Rack with 8-903's 1-902's 1-924's (Other Cards Available)
The 903 Module
OverEasy® Compressor

missing image: DBX903.jpg
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 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

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
dbx 903 Specifications

Frequency Response: 20 Hz - 20 kHz, ±0.5 dB
Input: Balanced: 25 k
Unbalanced: 18.5 k
Maximum Input Level: +24 dBu
Output: Unbalanced: 22
Maximum Output Level: +24 dBu into 600
THD: <0.02% @1 kHz, With any amount of compression
Dynamic Range: 112 dB
Compression Ratio: 1:1 through :1 to -1:1
Controls: In/out Switch, Threshold Knob, Ratio Knob, Output Adjust Knob
Indicators: Input: Red, Infinity+ Compression: Red
Metering: 10 Segment LED bargraph indicating Gain Reduction
Compression Characteristic: OverEasy®


The 904 Module
Noise Gate

missing image: DBX904.jpg
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
  • Programmed latch mode
  • Variable attack and release times
  • Hardwire bypass switch
dbx 904 Specifications

Frequency Response: 20 Hz - 20 kHz, ±0.5 dB
Input: Balanced: 25 k
Unbalanced: 18.5 k
Maximum Input Level: +24 dBu
Output: Unbalanced: 22
Maximum Output Level: +24 dBu into 600
THD: <0.02% @1 kHz
Dynamic Range: 106 dB
Threshold Range: -40 - +10 dBu, Variable
Controls: KEY Mode Switch, PLM Switch, Gate In Switch, Attenuation Limit Knob, Attack/Release Knob, Threshold Knob, Ratio Knob
Indicators: Input: Red, PLM: Green, Key: Red
Metering: 10 segment LED bargraph indicating Gain Reduction


The 905 Module
3-Band Parametric/Notch Equalizer

missing image: DBX905.jpg
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.

Color 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
dbx 905 Specifications

Frequency Response: 20 Hz - 20 kHz, ±0.5 dB
Input: Balanced: 25 k
Unbalanced: 18.5 k
Maximum Input Level: +24 dBu
Output: Unbalanced: 22
Maximum Output Level: +24 dBu into 600
THD: <0.03% @1 kHz, with any boost or cut
Dynamic Range: 112 dB
Controls: Parametric EQ In/Out Switch, Symmetrical Shelving Switch (high and low); For Each Band: Frequency Center Adjustment Knob, Boost/Cut Knob, Q Adjustment Knob
Indicators: Clip Light: Red, In/Out: Red, Gain:Red



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