there were some buttons (over easy, countour) that aren't are on other compressors but are just called different things.. thats the main reason i wanted the manual for that model. though i wasn't able to find a manual, i did a search on ebay for the 166a and found a couple of them for sale where the description of the 166a actually had alot of the information i was looking for
The dbx 166A Professional Dynamics Processor provides two channels of noise gating, OverEasy'® or classic Hard Knee compression and PeakStop limiting to give complete control of signal dynamics to studios, sound reinforcement companies, musicians, or anyone who needs quality processing quickly and easily.
Features include:
• Stereo or Dual Mono operation of gating, compression and peak limiting.
• OverEasy®/Hard Knee Selection - allows selection between our famous OverEasy compression curve and the classic "Hard Knee" curve popularized by the original
dbx 160, 161 and 162.
• Expander/Gate Circuit - with variable release time and +15dB maximum threshold.
• Compressor Mode switch - selects from two sets of program-dependent Attack and Release times to tailor response for individual instruments or mixed program material.
• Selectable Low Frequency Shelf (via Contour button) in the Sidechain Path - recommended when compressing mixed program material to prevent low frequency energy from punching "holes" in the sound.
• PeakStop® Limiting - provides control of maximum peak levels at the output of the 166A regardless of any other control. PeakStop comes after the compression, gating and other circuitry including the output gain, so it lets an absolute limit be put on the peak excursions before they reach the output.
• True RMS Level Detection - senses the power in the program in a musical manner, much as human hearing does, giving results superior to peak or average detection.
• Hardwire System Bypass Buttons on both channels - allow the audio to pass even if the unit is unplugged, and are also useful for comparing the processed and unprocessed signal.
• 10-Segment LED Display for GAIN REDUCTION (up to 30dB).
• Electronically Balanced XLR and 1/4" TRS Input and Output Jacks
• Separate Sidechain Inserts - enables an outboard processor or signal to control compression or gating.
• DC-Controlled Parameters - the signal does not pass thru any of the parameter controls. Instead a DC voltage controls all functions; this eliminates any possibility of potentiometer noise developing over time.
Has XLR balanced and 1/4” tip ring sleeve balanced and unbalanced connections for inputs and outputs. Also has a side-chain insert connection.