The dbx 929 module is designed to reduce constant hiss in audio and video sources, such as older tapes, without sacrificing musical high frequencies. It features a fast sliding-filter design and includes two independent channels that can be strapped together for stereo applications to preserve imaging and balance. The device is intended for sources with a continuous, unchanging noise floor and is not suitable for removing hum, ticks, pops, or modulated noise.
| Filter Type | 2nd-order, minimum-phase |
|---|---|
| Frequency Response | 20 Hz-20 kHz +1 dB |
| THD | 0.03% |
| Equivalent Input Noise | -85 dBv |
| Input Impedance (Balanced) | 30 k-ohms |
| Input Impedance (Unbalanced) | 18.8 k-ohms |
| Output Impedance | 22 ohms |
| Maximum Input | +24 dBv |
| Maximum Outputs (Differential) | +24 dBv |
| Maximum Outputs (Unbalanced) | +23 dBv |
| Power Consumption | 3 W |
The main target is constant audio- and videotape and optical-soundtrack hiss.
No, the design is not intended to remove hum, ticks and pops.
You must move two jumpers on the board to change the outputs to their balanced setting.