diff --git a/src/app/loudnessEstim.h b/src/app/loudnessEstim.h
index 68e78f5..7d2ad01 100644
--- a/src/app/loudnessEstim.h
+++ b/src/app/loudnessEstim.h
@@ -14,9 +14,9 @@
 #include "exhaleAppPch.h"
 
 // constants, experimental macros
-#define LE_THRESH_ABS   (15.0f / 134217728.0f) // absolute threshold for -70 LUFS
-#define LE_THRESH_REL         0.1f // 2nd stage, relative threshold 10 dB below L
-#define LE_LUFS_OFFSET  -0.484375f // to return -3.01 LUFS for 997-Hz 0-dBFS sine
+#define LE_THRESH_ABS   (15.0f / 268435456.0f) // absolute threshold for -70 LUFS
+#define LE_THRESH_REL       0.1f // second stage, relative threshold 10dB below L
+#define LE_LUFS_OFFSET  2.53125f // to get -3.01 LUFS for mono 997-Hz 0-dBFS sine
 
 // ITU-R loudness estimator class
 class LoudnessEstimator
diff --git a/src/app/makefile b/src/app/makefile
index ba00bf0..18f2d8c 100644
--- a/src/app/makefile
+++ b/src/app/makefile
@@ -30,6 +30,7 @@ OBJS      = \
 	$(DIR_OBJ)/basicWavReader.o \
 	$(DIR_OBJ)/exhaleApp.o \
 	$(DIR_OBJ)/exhaleAppPch.o \
+	$(DIR_OBJ)/loudnessEstim.o \
 
 # define libraries to link with
 LIBS      = -ldl