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General| Frequency Response | 20 Hz to 20 kHz |
|---|---|
| Inputs | 2 |
| Outputs | 2 |
| Channels | 2 |
| Power Requirements | 120V, 60Hz |
| Weight | 5 lbs |
| Input Connectors | 1/4" Phone |
| Output Connectors | 1/4" Phone |
| Functions | Compression |
| Signal to Noise Ratio | Greater than 90 dB |
| Dimensions | 1.75 x 19 x 6 inches |
Detailed descriptions of the dbx Model 128's front panel switches and controls.
Identification and function of the dbx Model 128's rear panel connections and controls.
Steps for playing a dbx-encoded phonograph disc.
Steps for creating a dbx-encoded tape recording.
Steps for playing back a dbx-encoded tape.
Instructions for using the expander function.
Instructions for using the compressor function.
Steps for recording with peak limiting and dbx II tape noise reduction.
Explanation of dynamic range and its significance in audio.
How the dbx II tape noise reduction system works.
Explanation of the dbx expansion and compression features.
Guidance on when to use expansion, compression, peak limiting, and unlimiting.
Combining tape noise reduction with expansion for enhanced audio.
Combining tape noise reduction with compression for specific effects.
Guidelines for mounting, level/impedance, and grounding the unit.
How to connect graphic equalizers and equalized speaker systems.
Instructions for connecting the dbx 128 to preamplifiers or receivers.
Instructions for connecting the dbx 128 to a tape recorder.
Detailed steps for recording a dbx-encoded tape.
Detailed steps for playing back dbx-encoded tapes.
Detailed steps for playing dbx-encoded discs.
Methods for dubbing encoded discs and tapes in various formats.
Recommendations for setting recording levels with dbx.
Importance of tape selection, bias, equalization, and alignment for dbx.
How subsonics and interference affect dbx processing and mitigation.
Using the expander function independently of tape noise reduction.
Playing back tapes with dbx II noise reduction and expansion.
Using two dbx 128 units for quadraphonic sound processing.
Recording with both tape noise reduction and expansion simultaneously.
Performing peak limiting while decoding dbx II-encoded programs.
Explanation of the dbx system's compressor/expander concept.
Comparison between professional dbx and dbx II systems.
Overall frequency response of dbx II processing across the audible spectrum.
Analysis of asperity noise and tape modulation noise.
Explanation of how the 128 detects signal levels for processing.
Role of bandpass filters and pre-emphasis/de-emphasis in noise reduction.
Diagrams illustrating signal flow, filters, and frequency responses.
Definition and operation of the compressor and peak limiter functions.
Definition and operation of the expander and peak unlimiter functions.
Technical explanation of how the compression/expansion circuits function.
Technical specifications for the dbx II tape noise reduction system.
Technical specifications for the dynamic range enhancement section.
