1 files changed, 3 insertions, 0 deletions
diff --git a/src/bs2b.h b/src/bs2b.h
index ccdb6db..e70a4be 100644
--- a/src/bs2b.h
+++ b/src/bs2b.h
@@ -60,6 +60,9 @@
 /* Default sample rate (Hz) */
 #define BS2B_DEFAULT_SRATE   44100
 
+/* A delay at low frequency by microseconds according to cut frequency */
+#define bs2b_level_delay( fcut ) ( ( 18700 / fcut ) * 10 )
+
 typedef struct
 {
 	uint32_t level;              /* Crossfeed level */