The dbx 120XP is an undocumented studio effect that generates subharmonics. Its operation is opaque. Its design yields no known advantages over alternatives. Its utility depends entirely on tolerance for uncertainty.
The dbx 165 is a studio compressor. No technical specifications exist for it. It is categorised as a studio compressor. That is all that is confirmed.
The dbx 166 is a no-compromise stereo FET compressor built for speed and instrument tracking—not vocals, not mixing, not analysis. It delivers efficient, transparent compression with subtle warmth. Its design gives immediacy and reliability. It withholds metering, sidechain, vocal suitability, and fine dynamic control.
The dbx 160X is a fixed-response analog limiter/compressor built for immediacy, not nuance. It excels when slammed on snare, kick, bass, or guitar — but fails at subtlety, especially on vocals. Its simplicity is functional, not forgiving.
The Lindell Audio 902 De-Esser is a software de-esser. It has no published technical specifications. It belongs to the software de-esser category. That is all that is known.
The Waves dbx 160 is a software compressor plug-in released in 2015. It delivers fast, aggressive compression with minimal setup. It lacks flexibility and colour but excels at tightening drums and bass. It costs $49 on sale. It belongs in the mix bus, not the mastering chain.