diff --git a/spa/plugins/audioconvert/channelmix.c b/spa/plugins/audioconvert/channelmix.c
index bba0f5054..9e6d0cd1e 100644
--- a/spa/plugins/audioconvert/channelmix.c
+++ b/spa/plugins/audioconvert/channelmix.c
@@ -43,7 +43,7 @@
 
 #define NAME "channelmix"
 
-#define DEFAULT_RATE		44100
+#define DEFAULT_RATE		48000
 #define DEFAULT_CHANNELS	2
 
 #define MAX_SAMPLES	8192
diff --git a/spa/plugins/audioconvert/merger.c b/spa/plugins/audioconvert/merger.c
index 3588a99a7..ea8fe233a 100644
--- a/spa/plugins/audioconvert/merger.c
+++ b/spa/plugins/audioconvert/merger.c
@@ -96,6 +96,8 @@ struct impl {
 	struct spa_log *log;
 	struct spa_cpu *cpu;
 
+	struct spa_io_position *io_position;
+
 	uint64_t info_all;
 	struct spa_node_info info;
 	struct spa_param_info params[8];
@@ -236,7 +238,20 @@ static int impl_node_enum_params(void *object, int seq,
 
 static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
 {
-	return -ENOTSUP;
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_log_debug(this->log, NAME " %p: io %d %p/%zd", this, id, data, size);
+
+	switch (id) {
+	case SPA_IO_Position:
+		this->io_position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
 }
 
 static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
diff --git a/spa/plugins/audioconvert/resample.c b/spa/plugins/audioconvert/resample.c
index b2efd84ee..758653337 100644
--- a/spa/plugins/audioconvert/resample.c
+++ b/spa/plugins/audioconvert/resample.c
@@ -45,7 +45,7 @@
 
 #define NAME "resample"
 
-#define DEFAULT_RATE		44100
+#define DEFAULT_RATE		48000
 #define DEFAULT_CHANNELS	2
 
 #define MAX_SAMPLES	8192
diff --git a/spa/plugins/audioconvert/splitter.c b/spa/plugins/audioconvert/splitter.c
index 58ee49aef..56c94df6c 100644
--- a/spa/plugins/audioconvert/splitter.c
+++ b/spa/plugins/audioconvert/splitter.c
@@ -97,6 +97,8 @@ struct impl {
 	struct spa_log *log;
 	struct spa_cpu *cpu;
 
+	struct spa_io_position *io_position;
+
 	uint64_t info_all;
 	struct spa_node_info info;
 	struct spa_param_info params[8];
@@ -227,7 +229,20 @@ static int impl_node_enum_params(void *object, int seq,
 
 static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
 {
-	return -ENOTSUP;
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_log_debug(this->log, NAME " %p: io %d %p/%zd", this, id, data, size);
+
+	switch (id) {
+	case SPA_IO_Position:
+		this->io_position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
 }
 
 static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
@@ -385,6 +400,9 @@ static int port_enum_formats(void *object,
 					SPA_PARAM_EnumFormat, &port->format.info.raw);
 		}
 		else {
+			uint32_t rate = this->io_position ?
+				this->io_position->clock.rate.denom : DEFAULT_RATE;
+
 			*param = spa_pod_builder_add_object(builder,
 				SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
 				SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_audio),
@@ -409,7 +427,7 @@ static int port_enum_formats(void *object,
 							SPA_AUDIO_FORMAT_U8P,
 							SPA_AUDIO_FORMAT_U8),
 				SPA_FORMAT_AUDIO_rate,     SPA_POD_CHOICE_RANGE_Int(
-						DEFAULT_RATE, 1, INT32_MAX),
+						rate, 1, INT32_MAX),
 				SPA_FORMAT_AUDIO_channels, SPA_POD_CHOICE_RANGE_Int(
 						DEFAULT_CHANNELS, 1, MAX_PORTS));
 		}