diff --git a/firmware/baseband/dsp_iir_config.hpp b/firmware/baseband/dsp_iir_config.hpp
index 171a8969c..7e99ed03f 100644
--- a/firmware/baseband/dsp_iir_config.hpp
+++ b/firmware/baseband/dsp_iir_config.hpp
@@ -24,6 +24,12 @@
 
 #include "dsp_iir.hpp"
 
+// scipy.signal.butter(2, 30 / 24000.0, 'highpass', analog=False)
+constexpr iir_biquad_config_t audio_hpf_30hz_config {
+	{  0.99722705f, -1.99445410f,  0.99722705f, },
+	{  1.00000000f, -1.99444641f,  0.99446179f, }
+};
+
 // scipy.signal.butter(2, 300 / 24000.0, 'highpass', analog=False)
 constexpr iir_biquad_config_t audio_hpf_300hz_config {
 	{  0.97261390f, -1.94522780f,  0.97261390f, },
diff --git a/firmware/baseband/proc_wfm_audio.hpp b/firmware/baseband/proc_wfm_audio.hpp
index b4aa41bd5..6b0fed885 100644
--- a/firmware/baseband/proc_wfm_audio.hpp
+++ b/firmware/baseband/proc_wfm_audio.hpp
@@ -49,7 +49,7 @@ private:
 	const fir_taps_real<64>& audio_filter_taps = taps_64_lp_156_198;
 	dsp::decimate::FIR64AndDecimateBy2Real audio_filter { audio_filter_taps.taps };
 
-	IIRBiquadFilter audio_hpf { audio_hpf_config };
+	IIRBiquadFilter audio_hpf { audio_hpf_30hz_config };
 };
 
 #endif/*__PROC_WFM_AUDIO_H__*/