Generic IIR Mode Added to FIR Designer

A ‘Generic’ IIR filter mode has been newly added to FIR Designer (v3.5) & FIR Designer M (v2.6). It increases speed & accuracy when working with processors that don’t have their own branded IIR filter mode within the IIR Reference Editor.

The Reference Editor was added to FIR Designer & FIR Designer M in 2019, making it possible to convert & match IIR filter settings across brands with different Q or BW interpretations. Brands currently represented with their own custom IIR filter modes include LakeLinea ResearchPowersoft, QSC Q-SYS, Symetrix, BSSBiamp Tesira & Marani.

For all other processor brands, the new ‘Generic’ filter mode is the best place to start when creating optimized IIR filters. It includes bandpass filters, low and high shelf, low-pass and high-pass Bessel, Butterworth, Chebyshev I & II, Elliptic, Linkwitz/Riley & Neville Thiele notched crossovers. It also uses Robert Bristow-Johnson Q & BW definitions for many filters.

The Generic mode now operates as the default mode within the IIR Reference Editor, and IIRs can be automatically converted between the Generic mode and any of the other branded modes in a single click.

We’ve also modified the Lake IIR filter mode to include Lake-specific filters only. It replaces the original, broader ‘General (Lake)’ mode, which has been renamed ‘Legacy’ & is still available. When loading projects and systems that previously used ‘General (Lake)’, the IIR mode will now show as ‘Legacy’.

Let us know what other processor brand you’d like to see included with a custom IIR mode in FIR Designer.

FIR Designer M Release Notes | FIR Designer Release Notes

New ‘Generic’ option in the filter mode menu

In this step-by-step case study, see how FIR Designer (using averaged measurements captured in Rational Acoustics’ Smaart®) was recently used to tune a system using only IIR filters – no FIRs at all – at a newly-renovated church in Australia.