SplineEQ FREE - Photosounder

Product Description

Please Note: This is the FREE VERSION of the SplineEQ.

This free version only has up to 4 bands as opposed to up to 60 bands. Also, the free version cannot open or save presets.


  • Linear phase equalizer. Offers a better sound quality than the more common minimum phase equalizers by not affecting the phase of sound, only the intensity of frequencies, which makes it easier to achieve good sounding results. Also has the advantage of not incurring aliasing artifacts.
  • Spline-based filter design. Filters are simply created by designing a spline curve that can be made to adopt any imaginable shape. No filter types to choose from, all points simply define part of the shape of the filter's spline curve. The actual filter's frequency profile is displayed as a dashed curve when it differs from the ideal spline curve (this can be changed by changing the filter's resolution).
  • Up to 4 bands or as low as 1. You can create or disable bands by double-clicking on the visualization area of the interface and adjusting them either in that area or using the knobs or even the automatable parameter sliders in the host's interface.
  • Simple curve modification functions. You can modify the curve as a whole using the transpose function to shift the curve up and down by up to 10 octaves, affect the overall gain to shift all gain settings up or down evenly or even change the gain scale to apply a ratio to all gains, thus enabling you to either flatten, exaggerate or reverse the shape of a curve.
  • Frequency analyzer. More intuitive than your usual logarithmic curve frequency display, this frequency analyzer shows you the intensity of frequencies before and after the filtering with colors. It's also fine-tuned so that intensities at different frequencies are represented in a way that matches closely to our perception. It moves in a fluid manner in sync with the source sound and has a frequency resolution of about 10 Hz.
  • Smooth and fluid graphics. The whole interface responds fluidly to change, even the frequency visualization has a great frame rate and all the graphics are perfectly anti-aliased.
  • -Infinite dB to +60 dB gain range. This allows you to completely silence entire ranges of the spectrum or to really bring back some fainter harmonics by boosting their amplitude thousandfold. Gains are represented logarithmically between -60 dB and +60 dB and linearly below -60 dB. Given the uniquely immense gain range, there's also a built-in limiter whose knob lights up when over the adjustable threshold. You can also zoom in to as low as ±3 dB.
  • Smooth transitions. Changing parameters, either by adjusting the knobs, the graph, or by parameter automation is always done smoothly and creates no audio artifacts.
  • Adjustable resolution, latency, and CPU usage. The resolution of the filter can be lowered or increased (up to roughly 22 Hz) and the processing latency can be changed to obtain a lower CPU usage or a lower latency.
  • Good performance. Linear phase equalizers always require more power than other types of equalizers. However SplineEQ FREE is as fast or faster than other linear-phase equalizers, often with less latency.
  • Also supports all sampling rates (384 kHz included), is available on both Windows and Mac, in VST (2.4) and AU format, in 32 and 64 bits. All input, output, and processing are done in 64-bit floating-point format and in stereo.

System Requirements


  • VST 2.4 (32/64bits)


  • VST 2.4 (32/64bits)
  • Audio Unit
  • Important Note: macOS 10.15 Catalina and macOS 11 are NOT supported.

Install Instructions

1. Log into your Plugin Boutique user account. Under the tab ‘My Products’, you will see SplineEQ FREE listed.

2. Select your platform and click the appropriate Native download.

3. Unarchive the .zip file.

4. Select either the .dll file (Windows) or .component (Mac), and copy the selected file into the correct directory: C:\Program Files\Steinberg\VstPlugins for Windows or /Library/Audio/Plug-ins for Mac.

Your SplineEQ FREE will now be ready to use!


Digital Product - Delivered via Email.

32 & 64 Bit


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