1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu8910.ts b/src/emu8910.ts
index 892df35..fc39745 100644
--- a/src/emu8910.ts
+++ b/src/emu8910.ts
@@ -214,7 +214,7 @@ class FirFilter {
             buffer[this.offset + i] = samples[i];
         }
         for( i = 0; i < h.length; i++){
-            y += h[i] * sub[i];
+            y += h[i] * (sub[i] + sub[h.length - i - 1]);
         }
         for( i = 0; i < m; i++){
             buffer[this.offset + length - m + i] = buffer[this.offset + i];