IIR vs FIR - shaping loudspeaker phase with FIR Designer - screenshot

Shaping Loudspeaker Phase: FIR vs IIR

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FIR filtering offers advantages over traditional IIR all-pass filters when flattening the phase of a loudspeaker or shaping the phase to match others in an installation. IIR filters have a negative phase gradient & only provide time delay with increasing frequency. However, FIR filtering can implement phase responses with both positive & negative gradients, providing arbitrary phase/time shaping of a loudspeaker response.

FIR Designer offers traditional 1st & 2nd order minimum-phase all-pass filter prototypes, plus maximum-phase (inverted phase) versions & a unique 4th order parametric phase filter with a range of ±90 degrees, adjustable BW & frequency. An unlimited number of prototypes can be used to create the combined FIR filter phase response.

Learn more about FIR Designer or download a free demo (Windows or Mac).

Existing FIR Designer 1 license-holders are eligible for a USD $100 coupon towards the first-year purchase of FIR Designer 2.2; just contact us.