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.

FIR Designer SMAART® Update

Smaart V9 compatibility has been added to FIR Designer (v3.5) & FIR Designer M (v2.6) and works with SMAART Suite, Real-Time and Light Editions.

Load previously saved SMAART measurements & use them as the starting point for FIR filter & preset design, or use SMAART® Control from within FIR Designer to capture measurements in real-time directly from SMAART running locally or on the local network. Measurements capture in SMAART Control can then be sent via a single click to either the ‘Import’, ‘Target’ or ‘Averaging’ tabs.

In addition, the latest updates add automatic saving of all SMAART measurements sent to the ‘Averaging’ tab, when saving an averaging session. The measurements are saved to a new *.FDM file format & will be loaded when the averaging session file is loaded in the future.

Check out this video to see how SMAART Control works (using Smaart V8; same functionality for v9), or download a free demo of our software to experiment.

FIR Designer M Release Notes | FIR Designer Release Notes

SMAART is a registered trademark of Rational Acoustics LLC, Connecticut, USA.

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.

Room Tuning without FIR….?

FIR Designer takes room tuning to another level by enabling the creation of arbitrary-phase FIR filters that perform room EQ, phase-correction and loudspeaker magnitude & phase matching.

But not all processors and amplifiers have user-accessible FIR settings.

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.

SMAART is a registered trademark of Rational Acoustics LLC, Connecticut, USA.

Room Tuning With IIRs using FIR Designer

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.

Biamp Tesira IIR filter mode added to FIR Designer

Biamp in FIR Designer's IIR Reference Editor

FIR Designer & FIR Designer M have been newly updated to include a Biamp Tesira IIR filter mode that provides emulation of 48kHz IIR filter behaviour in the Tesira range of Biamp products and aids mixed IIR+FIR Tesira preset creation. IIR responses in the new Biamp Tesira IIR mode can be converted to/from Lake, Linea ResearchPowersoft, Q-SYS, Symetrix, BSS & Marani IIR modes using the IIR Reference Editor.

The IIR Reference Editor (in FIR Designer 3.4 & FIR Designer M 2.5) enables the automated conversion of IIR filters between brands in a single click. This ensures IIR response matching when working with different amplifiers & processors, and solves the problem of standard filter settings producing different results on various amplifier/processor brands (learn more). Check out this video tutorial of the IIR Reference Editor to see how it works. (Note, the video demonstrates the original non-automated conversion process which usually required manual parameter adjustments to complete the match; these manual adjustment have been replaced by one-click conversion in more recent versions of the FIR Designer software).

FIR Designer M Release Notes

FIR Designer Release Notes

*When using FIR Designer to convert IIR filters for brands not listed, we recommend trying all modes within the FIR Designer IIR tab, & comparing the plots displayed with the IIR plots generated by your own control software to determine which mode produces the closest match.

 

FIR Designer Feature Update

New FIR Designer Features June 2022

Here’s a few of the features added to FIR Designer in 2022 so far…


More brands & file formats supported
. FIR filter export for Xilica TXT files & REW magnitude/phase text file import are both now supported. Lake XP modules can now have 96 kHz output channels (in addition to 12, 24 and 48 kHz). Marani Pro Audio specific IIR filters have been added to the list of brand specific IIR filter modes.

Automatic IIR Conversions
. The IIR Reference Editor now automatically converts IIRs from one brand to another in a single click, eliminating the need for manual adjustments entirely. Supported brands include Lake, Marani, Linea ResearchPowersoft, QSC Q-SYS, Symetrix & BSS. Learn more.

Independent FIR sample rate export. The exported FIR filter sample rate can now be set independently of the workflow’s Design Sample rate. This allows the FIR filter to have a different sample rate to the IIR filtering and delay; ideal for processors that use one sample rate for the bulk of core processing, such as 96 kHz, but only accept FIR filters at a different sample, such as 48 kHz. Learn more.

Workflow speed improvements.
Both the Auto Mag and Auto Phase computation can now be optionally paused to reduce program update lag while working in the IIR, Mag Adjust and Phase Adjust tabs.

Copy & Paste between windows & programs
. Easily transfer filter table data across windows in FIR Designer and FIR Designer M, and also between products. Copy and paste buttons are available on the Target Mag and Phase, IIR, Mag Adjust, Phase Adjust and Voicing tabs and work between matching tabs (eg. Mag Adjust -> Mag Adjust).

Enhanced plot display customization. Both the IIR Filters tab and the IIR Reference Editor now have a BW/Q selector with each filter table list, enabling rapid switching between the BW & Q without having to change the setting in Preferences. In addition, on the Import tab time delay adjustment can now be viewed in mm, feet and inches.

 

FIR Designer M release notes       FIR Designer release notes       Download FREE DEMO versions

NEW Automated IIR Filter Conversion Between Brands

 

One click automatic IIR conversion FIR Designer

Differences in IIR filter definitions continue to be a challenge when working with multiple brands of processors. The same Q or BW setting, for common IIR filter types, does not result in the same response across brands. Q or BW on one processor needs to be adjusted, often significantly, to match the response on another processor.

The IIR Reference Editor was added to FIR DesignerFIR Designer M in 2019, making it possible to convert & match IIR filter settings across brands with different Q or BW interpretations. The editor performed a quick and close conversion, with additional manual parameter adjustments usually required to complete the match. (This video demonstrates the original process.)

One click IIR conversion between brands

 

The latest update to the IIR Reference Editor eliminates the need for manual adjustments entirely by performing a precise, automated conversion from one brand to another in a single click.

When converting, FIR Designer automatically adjusts the BW or Q (and sometimes other parameters) to achieve an exact match, making it faster & easier to translate an IIR or mixed IIR+FIR preset from one brand of processor to another. The updates apply to parametric, LP and HP variable Q, all-pass, shelf and Bessel filters.

FIR Designer continues to expand the list of supported IIR filter modes and now includes Lake, Marani, Linea ResearchPowersoft, QSC Q-SYS, Symetrix & BSS.

The updated IIR reference editor is available in FIR Designer M 2.4 & FIR Designer 3.3, and is only accessible to software licensees. (It’s not available in free demo versions of the software.)

FIR Designer M 3.3.0 release notes
FIR Designer 2.4.0 release notes

 

 

Loudspeaker Preset Design | Independent FIR Sample Rate

 

Independent FIR output sample rate in loudspeaker preset

 

FIR Designer is ideal for creating complete single channel and multi-way loudspeaker presets (that include mixed IIR + FIR filtering). When creating a preset, both the workflow’s design sample rate and the export file format can be chosen to match those of the processor/amplifier being used.

Loudspeaker measurements of any sample rate can be imported into FIR Designer’s workflow, which supports design sample rates of 12, 24, 44.1, 48 88.2, 96, 176.4 & 192 kHz for all preset processing.

Previously, the chosen workflow design sample rate was used for all preset elements including delay, IIR and FIR filters. This created a challenge when designing filtering for processors that use one sample rate for the bulk of core processing, such as 96 kHz, but only accept FIR filters at a different sample, such as 48 kHz.

Recent FIR Designer and FIR Designer M updates offer enhanced flexibility & customization by enabling the export of the FIR filter at a different sample rate than the other preset components, such as IIR filters. On the FIR Designer ‘Export’ tab, at the end of the preset-creation process, use the new drop-down menu to choose the output sample rate for the FIR filter, before choosing the desired file format for export.

With a separate FIR filter output sample rate selected, FIR filter truncation and windowing are applied at the selected output sample rate. The FIR filter is then resampled back to the workflow sample rate for plots such as the Wavelet view.

 

 

Learn which loudspeaker measurement file formats can be imported into FIR designer for use in preset creation.

Download a free demo of any our software products or watch a video tutorial to learn how to use FIR Designer to design loudspeaker processing, including presets.

Download Averager loudspeaker measurement averaging software

AVERAGER now FREE | Loudspeaker Measurement Averaging Software (was $49)

Averager is a software application (for both macOS & Windows) that combines multiple loudspeaker measurements into a single measurement, for use in any audio & plotting tool.

FIR Designer has always included averaging functionality as an optional step in the filter-design workflow. In 2018 this functionality was made available as a stand-alone product in response to customer requests. Since then, Averager has become an invaluable tool for many audio professionals. To celebrate the 6th birthday of Eclipse Audio, we’re making it available to download absolutely free!

 

DOWNLOAD AVERAGER     PRODUCT INFO

Using Impedance Measurements to Inform Loudspeaker Filter Design

 

An impedance measurement gives useful information about how a loudspeaker driver behaves. It shows resonances (including box and driver), the port tuning frequency and apparent low-frequency extension. This can be very useful information to view when designing loudspeaker processing.

For example, knowing the LF driver port tuning frequency and adjacent resonances may aid in setting the high-pass filter frequency used to protect against over-excursion. At higher frequencies where the impedance may show driver or cabinet resonances, filtering (IIR or FIR) can be set to attenuate these frequencies so as not excite the resonances. These problematic frequencies could also be avoided by choosing crossover frequencies that effectively hand these frequencies to another loudspeaker driver.

In the most recent versions of FIR Designer and FIR Designer M, an impedance measurement can be loaded from file and viewed on almost any response plot in the filtering workflow. In FIR Designer M, a unique impedance measurement can be loaded for each channel.

Load the impedance data as a simple comma, space or tab separated two-column (frequency and impedance magnitude) or three-column (frequency, impedance magnitude and impedance phase) text (TXT) file. (Lines starting with non-numeric characters are ignored as comments or metadata. The impedance phase is not used nor displayed.)

On the right is a portion of an example impedance measurement file exported from DATS.

The screenshot below shows the new impedance file loading window in FIR Designer and FIR Designer M.

 

* This data was exported from the Dayton Audio Test System: DATS
*
* Manufacturer: 
* Model: 
D 0.0 [mm]
Re 0.00 [Ohms]
Fs 0.00 [Hz]
Zm 0.00 [Ohms]
BL 0.00 [N/A]
Qms 0.000
Qes 0.000
Qts 0.000
Vas 0.000 [liters]
L10k 0.00 [mH]
n0 0.00 [%]
dBSPL 0.00 [1W/1m]
Ms 0.00 [grams]
Cms 0.00 [mm/N]
*
*
Freq Impedance Phase
1.029 6.856 -2.745 
1.059 6.856 -2.745 
1.091 6.856 -2.745 
1.122 6.856 -2.745 
1.155 6.856 -2.745 
1.189 6.856 -2.745 
1.224 6.856 -2.745 
1.260 6.856 -2.745
...
...

This quick video shows how to load an impedance measurement and how the impedance appears behind other responses in the filter design workflow.

 

FIR Designer M Release Notes

FIR Designer Release Notes

New Marani IIR filter mode in FIR Designer M

Marani IIR filter mode

 

FIR Designer M version 2.2 now has a Marani IIR filter mode that provides emulation of IIR filter behaviour in Marani products and aids mixed IIR+FIR Marani preset creation. IIR responses in the new Marani IIR mode can be converted to/from Lake, Linea ResearchPowersoft, Q-SYS, Symetrix & BSS IIR modes using the ‘IIR Reference Editor.’

The ‘IIR Reference Editor,’ in FIR Designer and FIR Designer M, provides fast conversion of IIR settings between brands to ensure IIR response matching when working with different amplifiers & processors, and solves the problem of standard filter settings often producing different results on various amplifier/processor brands (learn more). Check out this video tutorial of the IIR Reference Editor to see how it works. (Note, the IIR Reference Editor is not enabled in demo versions of the software.)

We’ve also made available a brief tutorial showing how to load FIR filters – as TXT or CSV files – into Marani product control software. See Marani FIR Filters: How to load into Marani amplifier modules and processors

FIR Designer M Release Notes

(The Marani mode will soon be available in FIR Designer.)

*When using FIR Designer to convert IIR filters for brands not listed, we recommend trying all modes within the FIR Designer IIR tab, & comparing the plots displayed with the IIR plots generated by your own control software to determine which mode produces the closest match.

 

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