diff --git a/firmware/baseband/dsp_iir.hpp b/firmware/baseband/dsp_iir.hpp
index 97adb605f..1e06a737d 100644
--- a/firmware/baseband/dsp_iir.hpp
+++ b/firmware/baseband/dsp_iir.hpp
@@ -31,6 +31,11 @@ struct iir_biquad_config_t {
 	std::array<float, 3> a;
 };
 
+constexpr iir_biquad_config_t iir_passthrough {
+	{ { 1.0f, 0.0f, 0.0f } },
+	{ { 0.0f, 0.0f, 0.0f } },
+};
+
 constexpr iir_biquad_config_t iir_no_pass {
 	{ { 0.0f, 0.0f, 0.0f } },
 	{ { 0.0f, 0.0f, 0.0f } },