Intuitive filter-design software

Create custom FIR filters & complete mixed FIR+IIR presets for single & multi-way loudspeakers (or any DSP-based audio playback device).

Filter design involves complex computations. We do the math so you don’t have to. Just follow the workflow & use the controls to set the required parameters.

Load your audio measurements to get started.

(Use Direct Design mode to build FIR filters without measurements.)

Filters & presets for EQ & so much more


Maximise the audio quality of an individual loudspeaker, device or entire system.


Match different makes & models of loudspeakers in install systems.


Create tunings & presets with specific phase & magnitude characteristics.


Perform system or room correction.

Limitless customization options

Single or multi-channel FIR or FIR+IIR design.

Real-time filter calculation & FIR error display.

Multiple FIR sample rates plus independent sample rates on input filtering & each output channel.

Manual & auto FIR filter magnitude & phase adjustment, plus post-auto FIR EQ voicing.

Comprehensive range of IIR filter types across multiple processor brands.

Integrated measurement averaging.

Brand emulations & integrations

Comprehensive range of different measurement file formats supported.

SMAART® Control for live measurement streaming and capture.

Direct-to-processor (DTP) functionality. Replaces manual export/load for some amps & processors.

IIR reference editor with one-click IIR filter conversion between processor brands.

Automated, non-destructive resampling of imported measurements. (Measure at one sample rate and export filters at a different sample rate.)

Multiple FIR export formats for loading filters/presets into any product with user-accessible settings.

Visualize & Audition Your Designs In Real-Time

Color-customizable plots with on-plot filter mouse control.

Continuous Wavelet Transform display for time/frequency impulse response analysis.

Polar plots for understanding on and off-axis behaviour of the custom preset with polar measurements.

Built-in auditionDSP audio player + processor. LISTEN to your projects and systems.


Our filter design tools are used by a range of audio professionals, including AV designers/integrators/technicians, system engineers, acoustic consultants, loudspeaker designers, embedded audio engineers, consumer device manufacturers, audio educators & more.

more user feedback

Filter Design Products

Windows + macOS

Free Tools

Windows + macOS

Latest News

FIR Designer M polar map

New Polar Map in FIR Designer M v4

Posted on
In response to customer requests, the latest version of FIR Designer M includes a new polar ‘heatmap-style’ plot in the ‘Supplementary Responses’ window. The Supplementary…