diff --git a/src/main.rs b/src/main.rs
index a9c02e5..ece96ce 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -100,7 +100,7 @@ const APP: () = {
         ethernet_periph: (pac::ETHERNET_MAC, pac::ETHERNET_DMA, pac::ETHERNET_MTL),
         #[init([[0.; 5]; 2])]
         iir_state: [IIRState; 2],
-        #[init([IIR { ba: [0., 0., 0., 0., 0.], y_offset: 0., y_min: -SCALE - 1., y_max: SCALE }; 2])]
+        #[init([IIR { ba: [1., 0., 0., 0., 0.], y_offset: 0., y_min: -SCALE - 1., y_max: SCALE }; 2])]
         iir_ch: [IIR; 2],
         #[link_section = ".sram3.eth"]
         #[init(eth::Device::new())]