diff --git a/spa/plugins/audioconvert/channelmix-ops-c.c b/spa/plugins/audioconvert/channelmix-ops-c.c
index 3d4284111..1a6ff6265 100644
--- a/spa/plugins/audioconvert/channelmix-ops-c.c
+++ b/spa/plugins/audioconvert/channelmix-ops-c.c
@@ -47,11 +47,11 @@ static inline void vol_c(float *d, const float *s, float vol, uint32_t n_samples
 	}
 }
 
-static inline void add_c(float *d, const float *s0, const float *s1, uint32_t n_samples)
+static inline void avg_c(float *d, const float *s0, const float *s1, uint32_t n_samples)
 {
 	uint32_t n;
 	for (n = 0; n < n_samples; n++)
-		d[n] = s0[n] + s1[n];
+		d[n] = (s0[n] + s1[n]) * 0.5f;
 }
 
 static inline void sub_c(float *d, const float *s0, const float *s1, uint32_t n_samples)
@@ -211,14 +211,14 @@ channelmix_f32_2_3p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
 		if (mix->widen == 0.0f) {
 			vol_c(d[0], s[0], v0, n_samples);
 			vol_c(d[1], s[1], v1, n_samples);
-			add_c(d[2], s[0], s[1], n_samples);
+			avg_c(d[2], s[0], s[1], n_samples);
 		} else {
 			for (n = 0; n < n_samples; n++) {
 				float c = s[0][n] + s[1][n];
 				float w = c * mix->widen;
 				d[0][n] = (s[0][n] - w) * v0;
 				d[1][n] = (s[1][n] - w) * v1;
-				d[2][n] = c;
+				d[2][n] = c * 0.5f;
 			}
 		}
 		lr4_process(&mix->lr4[3], d[3], d[2], v3, n_samples);