diff --git a/spa/plugins/audioconvert/audioconvert.c b/spa/plugins/audioconvert/audioconvert.c
index 7873efdb0..d312b518b 100644
--- a/spa/plugins/audioconvert/audioconvert.c
+++ b/spa/plugins/audioconvert/audioconvert.c
@@ -1255,7 +1255,7 @@ static void set_volume(struct impl *this)
 	float volumes[SPA_AUDIO_MAX_CHANNELS];
 	struct dir *dir = &this->dir[this->direction];
 
-	spa_log_debug(this->log, "%p", this);
+	spa_log_debug(this->log, "%p have_format:%d", this, dir->have_format);
 
 	if (dir->have_format)
 		remap_volumes(this, &dir->format);
diff --git a/spa/plugins/audioconvert/channelmix-ops.c b/spa/plugins/audioconvert/channelmix-ops.c
index 54e094fe6..9bfc9dc95 100644
--- a/spa/plugins/audioconvert/channelmix-ops.c
+++ b/spa/plugins/audioconvert/channelmix-ops.c
@@ -199,8 +199,11 @@ static int make_matrix(struct channelmix *mix)
 			for (i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++)
 				matrix[i][i]= 1.0f;
 		}
+		if (dst_mask & FRONT)
+			filter_fc = true;
+		if (dst_mask & _MASK(LFE))
+			filter_lfe = true;
 		src_mask = dst_mask = ~0LU;
-		filter_fc = filter_lfe = true;
 		goto done;
 	} else {
 		spa_log_debug(mix->log, "matching channels");