diff --git a/spa/plugins/bluez5/a2dp-codec-aptx.c b/spa/plugins/bluez5/a2dp-codec-aptx.c
index 4af804cd1..721b90599 100644
--- a/spa/plugins/bluez5/a2dp-codec-aptx.c
+++ b/spa/plugins/bluez5/a2dp-codec-aptx.c
@@ -710,6 +710,11 @@ static const struct a2dp_codec aptx_ll_msbc = {
 	.increase_bitpool = msbc_increase_bitpool,
 };
 
+static const struct spa_dict_item duplex_info_items[] = {
+	{ "duplex.boost", "true" },
+};
+static const struct spa_dict duplex_info = SPA_DICT_INIT_ARRAY(duplex_info_items);
+
 const struct a2dp_codec a2dp_codec_aptx_ll_duplex_0 = {
 	APTX_LL_COMMON_DEFS,
 	.id = SPA_BLUETOOTH_AUDIO_CODEC_APTX_LL_DUPLEX,
@@ -718,6 +723,7 @@ const struct a2dp_codec a2dp_codec_aptx_ll_duplex_0 = {
 	.name = "aptx_ll_duplex",
 	.endpoint_name = "aptx_ll_duplex_0",
 	.duplex_codec = &aptx_ll_msbc,
+	.info = &duplex_info,
 };
 
 const struct a2dp_codec a2dp_codec_aptx_ll_duplex_1 = {
@@ -728,6 +734,7 @@ const struct a2dp_codec a2dp_codec_aptx_ll_duplex_1 = {
 	.name = "aptx_ll_duplex",
 	.endpoint_name = "aptx_ll_duplex_1",
 	.duplex_codec = &aptx_ll_msbc,
+	.info = &duplex_info,
 };
 
 A2DP_CODEC_EXPORT_DEF(
diff --git a/spa/plugins/bluez5/a2dp-codec-faststream.c b/spa/plugins/bluez5/a2dp-codec-faststream.c
index 7ad415645..03911945c 100644
--- a/spa/plugins/bluez5/a2dp-codec-faststream.c
+++ b/spa/plugins/bluez5/a2dp-codec-faststream.c
@@ -614,17 +614,23 @@ static const struct a2dp_codec duplex_codec = {
 	.reduce_bitpool = codec_reduce_bitpool,		\
 	.increase_bitpool = codec_increase_bitpool
 
-const struct a2dp_codec a2dp_codec_faststream = {
+static const struct a2dp_codec a2dp_codec_faststream = {
 	FASTSTREAM_COMMON_DEFS,
 	.id = SPA_BLUETOOTH_AUDIO_CODEC_FASTSTREAM,
 	.name = "faststream",
 };
 
+static const struct spa_dict_item duplex_info_items[] = {
+	{ "duplex.boost", "true" },
+};
+static const struct spa_dict duplex_info = SPA_DICT_INIT_ARRAY(duplex_info_items);
+
 const struct a2dp_codec a2dp_codec_faststream_duplex = {
 	FASTSTREAM_COMMON_DEFS,
 	.id = SPA_BLUETOOTH_AUDIO_CODEC_FASTSTREAM_DUPLEX,
 	.name = "faststream_duplex",
 	.duplex_codec = &duplex_codec,
+	.info = &duplex_info,
 };
 
 A2DP_CODEC_EXPORT_DEF(
diff --git a/spa/plugins/bluez5/a2dp-codecs.h b/spa/plugins/bluez5/a2dp-codecs.h
index 90bca0268..9ec6d7356 100644
--- a/spa/plugins/bluez5/a2dp-codecs.h
+++ b/spa/plugins/bluez5/a2dp-codecs.h
@@ -43,7 +43,7 @@
 
 #define SPA_TYPE_INTERFACE_Bluez5CodecA2DP	SPA_TYPE_INFO_INTERFACE_BASE "Bluez5:Codec:A2DP:Private"
 
-#define SPA_VERSION_BLUEZ5_CODEC_A2DP		3
+#define SPA_VERSION_BLUEZ5_CODEC_A2DP		4
 
 struct spa_bluez5_codec_a2dp {
 	struct spa_interface iface;
diff --git a/spa/plugins/bluez5/bluez5-device.c b/spa/plugins/bluez5/bluez5-device.c
index c14974dfd..8852e1891 100644
--- a/spa/plugins/bluez5/bluez5-device.c
+++ b/spa/plugins/bluez5/bluez5-device.c
@@ -301,6 +301,8 @@ static void emit_info(struct impl *this, bool full);
 
 static float get_soft_volume_boost(struct node *node)
 {
+	const struct a2dp_codec *codec = node->transport ? node->transport->a2dp_codec : NULL;
+
 	/*
 	 * For A2DP duplex, the duplex microphone channel sometimes does not appear
 	 * to have hardware gain, and input volume is very low.
@@ -310,7 +312,8 @@ static float get_soft_volume_boost(struct node *node)
 	 * If this causes clipping, the user can just reduce the mic volume to
 	 * bring SW gain below 1.
 	 */
-	if (node->a2dp_duplex && node->transport &&
+	if (node->a2dp_duplex && node->transport && codec && codec->info &&
+			spa_atob(spa_dict_lookup(codec->info, "duplex.boost")) &&
 			node->id == DEVICE_ID_SOURCE &&
 			!node->transport->volumes[SPA_BT_VOLUME_ID_RX].active)
 		return 10.0f;	/* 20 dB boost */