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The SplineEQ Black Friday deal from Photosounder is 34% off, which brings this linear phase EQ plugin to $19, with the offer ending Nov 22, 2026.
Instead of picking filter types, you draw the curve. Every point you place shapes part of a Bézier spline, and the filter follows it.
SplineEQ is an equalizer plugin built to be simple and flexible. The maker says a spline curve can take on any shape you can imagine.
There are no bell, shelf or cut modes to choose from. When the real filter profile differs from your ideal curve, it shows up as a dashed line, and you can change that by adjusting the filter's resolution.
The maker says linear phase gives better sound quality than the more common minimum phase EQs. It changes the intensity of frequencies without touching the phase of the sound.
It also avoids aliasing artefacts. The maker adds that this makes good-sounding results easier to reach.
Double-click the visualisation area to create or disable a band. You can adjust bands there, with the knobs, or with the automatable sliders in your host.
SplineEQ's gain display uses a logarithmic scale across the range from -60 dB up to +60 dB, then switches to a linear scale for anything lower than that. You can silence whole stretches of the spectrum, or boost faint harmonics by a factor of a thousand. The display can zoom in to ±3 dB.
The analyser shows frequency intensity before and after filtering, and the maker says it is tuned to match how we perceive loudness across the spectrum.
Linear phase EQs need more processing power than other types. The maker says SplineEQ is as fast as or faster than other linear-phase equalizers, often with less latency.
You can raise the filter resolution to roughly 22 Hz, or trade resolution for lower CPU load or lower latency. Presets can be saved and opened, except in the free version. The format works across platforms and hosts and opens in a text editor.
SplineEQ supports all sampling rates on Windows and macOS, 384 kHz included.
Yes. The SplineEQ Black Friday deal is 34% off, which brings the plugin to $19. The offer ends Nov 22, 2026. SplineEQ is a linear phase EQ from Photosounder that uses Bézier spline curves for filter design.
SplineEQ gives you up to 60 bands, or as few as 1. The free version is limited to 4. Double-click the visualisation area to create or disable a band, then adjust it there, with the knobs, or with the host's automatable parameter sliders.
The range runs from -infinite dB to +60 dB, so you can silence whole parts of the spectrum or boost faint harmonics a thousandfold. A built-in limiter has an adjustable threshold, and the display can zoom in to ±3 dB.
SplineEQ supports all sampling rates on Windows and macOS, including 384 kHz. Filter resolution goes up to roughly 22 Hz, and you can adjust processing latency to get lower CPU usage or lower latency, depending on what your session needs.
Prices and end dates are checked at publishing time and can change, so confirm them at the store before you buy.