diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index ed7a171ac7..e41a0aec65 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -434,7 +434,7 @@ static void extract_exponents(AC3EncodeContext *s)
  * Exponent Difference Threshold.
  * New exponents are sent if their SAD exceed this number.
  */
-#define EXP_DIFF_THRESHOLD 1000
+#define EXP_DIFF_THRESHOLD 500
 
 
 /**
diff --git a/tests/ref/acodec/ac3_fixed b/tests/ref/acodec/ac3_fixed
index 17159e18a7..5c75ecd074 100644
--- a/tests/ref/acodec/ac3_fixed
+++ b/tests/ref/acodec/ac3_fixed
@@ -1,2 +1,2 @@
-9823c8f74097eab5d148cf0536ae932e *./tests/data/acodec/ac3.rm
+37e119c644ba0472c079d0e907bf78df *./tests/data/acodec/ac3.rm
 98751 ./tests/data/acodec/ac3.rm
diff --git a/tests/ref/lavf/rm b/tests/ref/lavf/rm
index d9ec51e596..c26dd0a28c 100644
--- a/tests/ref/lavf/rm
+++ b/tests/ref/lavf/rm
@@ -1,2 +1,2 @@
-e1990def7b195a568340f2c1a89d6587 *./tests/data/lavf/lavf.rm
+b97899ef2812cd1c8851dea550e042e4 *./tests/data/lavf/lavf.rm
 346706 ./tests/data/lavf/lavf.rm