ThirtyOne MK2

Name: ThirtyOne MK2
Price: 23.83 USD
Author: HoRNet

by HoRNet · EQ · 31-band graphic EQ and analyzer

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ThirtyOne MK2 combines a 31-band third-octave graphic EQ with a matching spectrum analyzer modelled on an Italian analog analyzer.

Its AutoEQ can match a target curve using three algorithms, and each band can be bypassed, soloed or left out of AutoEQ, for about $23.83.

Best for: Mix Bus, Mastering, Vocals. Genres: all genres.

Keywords: built-in analyzer, full mix, inspired by, broad-strokes, bus processing, hardware emulation, mastering, mix bus, mixing, smooth, static, vocals.

What it does

ThirtyOne MK2 puts a hardware-style spectrum analyzer and a 31-band graphic EQ in one plugin, with an AutoEQ that can push the EQ towards a target curve. HoRNet modeled the analyzer on "a well-known Italian analog spectrum analyzer", including its response time.

Analyzer: 31 third-octave bands, each a column of 12 LEDs with smooth lighting and a 20 dB/octave filter like the analog unit. Each LED can stand for 1, 2, 3 or 6 dB.
Analyzer options: three integration times (0.25, 1 and 4 seconds), four scale ranges, peak hold, and a choice of Mid (L+R) or Side (L-R) analysis.
Graphic EQ: 31 third-octave bands at ±15 dB each. Every band can be bypassed, soloed or typed in as a number, and there is a main EQ bypass.
AutoEQ: three algorithms, Average, Median and Lucky, in continuous or fixed mode. An EQ Amount knob scales how hard it works, and single bands can be left out of the matching.
Target curves: a compensation curve you can edit, save and load, so AutoEQ aims at your own tonal target.
CPU and interface: the analyzer and EQ modules can each be switched off to save CPU; the GUI is scalable and hardware-accelerated, with preset save and load.

Version 2.1.2 is a free update for owners, fixing preset crashes and silent exports in FL Studio and other hosts. The demo is fully working but goes silent now and then, can't save presets and ignores automation.

Source: HoRNet product page

When to use it

ThirtyOne MK2 is the better pick when you want to balance a whole mix or master by eye on a classic third-octave display and then let the EQ follow a target curve. Compared with Pro-Q 4 or TDR Nova it is far less precise: its bands sit at fixed third-octave points, so it can't make narrow cuts or dynamic moves. Next to SPAN it is a less detailed analyzer, but it can act on what it shows. Unlike smart:EQ 4, which picks a tonal target with AI, it leaves the target curve to you, and it costs a fraction of the price.

Best for: broad tonal balancing of mixes and masters against a reference curve, and anyone who likes reading a hardware-style RTA.
Genres: all.
Look elsewhere if: you need narrow, surgical or dynamic EQ; Pro-Q 4, TDR Nova or HoRNet's own TotalEQ MK2 fit better.

Where to buy

HoRNet: $23.83 (Listed at €20.99; converted at €1 = $1.1355 (ECB rate, 29 Sep 2026))

Tutorials and reviews

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