diff --git a/src/gba/gba-audio.c b/src/gba/gba-audio.c
index 098bb90d0..dab08a8c6 100644
--- a/src/gba/gba-audio.c
+++ b/src/gba/gba-audio.c
@@ -310,15 +310,15 @@ static void _sample(struct GBAAudio* audio) {
 	}
 
 	if (audio->chALeft) {
-		sampleLeft += audio->chA.sample >> audio->volumeChA;
+		sampleLeft += (audio->chA.sample << 2) >> audio->volumeChA;
 	}
 
 	if (audio->chARight) {
-		sampleRight += audio->chA.sample >> audio->volumeChA;
+		sampleRight += (audio->chA.sample << 2) >> audio->volumeChA;
 	}
 
 	if (audio->chBLeft) {
-		sampleLeft += audio->chB.sample >> audio->volumeChB;
+		sampleLeft += (audio->chB.sample << 2) >> audio->volumeChB;
 	}
 
 	if (audio->chBRight) {