Final Mix Software Mastering EQ III [WiN-MAC]

• Product: Mastering EQ III
• Developer: Final Mix Software
• Version: 3.0.0
• Format: VST, VST3, AAX, AU
• Requirements: Windows 10 or later, macOS 10.15 or later
• Source: finalmixsoftware.com/eq9

Mastering EQ III is an 8-band equalizer plugin from Final Mix Software built for mastering-chain and master-bus use, with continuously variable frequency selection across every band plus separate switchable low-pass and high-pass filters. Each band carries an x1 or x3 range switch for choosing between subtle and wide boost/cut, independent per-band bypass, and input/output gain with high-resolution metering. It runs as VST2, VST3, AU, and AAX on macOS 10.15+ and Windows 10/11, positioned as a transparent, non-modeled EQ rather than a named analog circuit reissue.

Key Takeaway

The core value is eight continuously variable bands with a per-band x1/x3 range switch, giving fine control at both subtle and aggressive settings on one knob. Unlike Final Mix’s own EQ-73 and Westlake models, it isn’t built around a named analog circuit — a mixer chasing that specific vintage character won’t find it here.

One Knob, Two Gain Ranges

Frequency selection on all eight bands moves continuously rather than snapping to fixed center points, so a null point between two problem frequencies is reachable directly instead of landing between two preset steps. Boost and cut on each band switch between an x1 and an x3 range, putting a fine, subtle adjustment and a wide, dramatic one on the same control rather than requiring a second higher-range band elsewhere in the chain.

That range switch changes what a single knob rotation is worth — the same physical turn that nudges a band half a dB in x1 mode can swing several dB in x3, so recalling a setting by ear after switching range modes takes a fresh listen rather than assuming the knob position still means what it did before the switch.

Selectable Filters, Not Continuous Ones

Separate switchable low-pass and high-pass filters sit alongside the eight parametric bands, rolling off the extreme top or bottom of a master bus without spending one of the eight bands on a shelf doing the same job. That keeps all eight bands free for tonal shaping while the filters handle boundary cleanup.

“Selectable” is the operative word for these filters, distinct from the continuously variable behavior of the eight main bands — the LP/HP stage switches between points rather than sweeping to any frequency the way each of the eight bands does. A mastering chain that needs a highpass corner nudged by a few Hz to match a reference curve makes that adjustment on one of the eight bands instead, since the dedicated filter section doesn’t offer that same continuous reach.

Eight Bypass Switches, One Curve

Each of the eight bands carries its own bypass, so a single band’s contribution can drop out of the signal while the rest of the curve keeps running — useful for confirming which band is actually doing the work partway through building a mastering curve, rather than bypassing the whole plugin and losing every band’s setting at once.

With eight separate bypass switches on one plugin, the practical use is building a curve by soloing bands one at a time to hear what each is contributing, rather than flipping all eight to compare full alternate EQ curves against each other — for that kind of A/B, the whole-plugin bypass is the faster tool.

Precise I/O Metering, No Loudness Reading

Input and output gain sit on either side of the eight-band and filter stage, so overall level into the EQ curve and out of it can be trimmed independently of any single band’s boost or cut — useful for matching output level to a reference track without touching the tonal balance already dialed in.

High-resolution metering tracks that input and output level, giving a mastering engineer a level readout precise enough to catch small gain-staging drift across a session without reaching for a separate metering plugin on the same insert.

Metering here covers input and output level, not the finished loudness standards a mastering chain typically needs downstream — LUFS, true peak, or any streaming-target reading isn’t part of what this plugin measures. The output gain trim is a static level control, not an integrated measurement over time, so it doesn’t substitute for a loudness reading even as a rough proxy — a dedicated loudness meter still sits later in the chain.

FAQs