Empirical Labs ELQ Lil FrEQ

The EQ Sections HP - The High Pass section is a sharp filter that cuts all content below one of eight pre-selected frequencies.  Empirical Labs calls this particular filter a "colored" filter since it is very steep and has a special shape that prevents thinning out frequencies just above the :cutoff" frequency.  The corner frequency is indicated by LEDs that glow softly when the section is bypassed, and brightly when the section is engaged.  As with all the EQ section in the Lil FrEQ, there is a dedicated bypass switch.

High and Low Shelving - These are very similar to your standard "Tone Control", but extremely high performance, providing exceptionally smooth boost and cut on the "bass" and "treble" frequencies.

Parametric EQ Sections - There are four sections of fully parametric EQ... possible the cleanest parametric EQ section ever produced - operating below 0.0007% THD at extremely high audio levels.

Dynamic EQ Section - The DS section combines filters with a compressor-like circuit that can help contain and control excessive high frequency content such as sibilants, especially in the absence of other lower frequency content.  There are two modes of operation, with threshold control as well as a frequency select control. There are four LEDs that indicate the amount of Gain Reduction: -1dB, -4dB, -8dB, -12dB.  The Ds section provides the highest performance, easiest to use, and most natural De-esser ever built, as well as a one of a kind, soft-knee High Frequency Limiter.