Check implementation of IIR FilterBankTypes
When using DAFF directivities with the FreeField renderer with "iir_biquads_order10" as FilterBankType in the according .ini file, the magnitude spectra are heavily averaged, resulting in wrong third-octave band spectra (~20 dB errors per band can be reached). However, switching to "fir_spline_linear_phase" filters perfectly solves this "problem".