diff --git a/class/audio/usbd_audio.c b/class/audio/usbd_audio.c
index df177220..1d1d0c8e 100644
--- a/class/audio/usbd_audio.c
+++ b/class/audio/usbd_audio.c
@@ -65,7 +65,7 @@ struct audio_entity_info {
 static usb_slist_t usbd_audio_entity_info_head = USB_SLIST_OBJECT_INIT(usbd_audio_entity_info_head);
 
 const uint8_t default_sampling_freq_table[] = {
-    AUDIO_SAMPLE_FREQ_NUM(8),
+    AUDIO_SAMPLE_FREQ_NUM(5),
     AUDIO_SAMPLE_FREQ_4B(8000),
     AUDIO_SAMPLE_FREQ_4B(8000),
     AUDIO_SAMPLE_FREQ_4B(0x00),
@@ -75,21 +75,21 @@ const uint8_t default_sampling_freq_table[] = {
     AUDIO_SAMPLE_FREQ_4B(32000),
     AUDIO_SAMPLE_FREQ_4B(32000),
     AUDIO_SAMPLE_FREQ_4B(0x00),
-    AUDIO_SAMPLE_FREQ_4B(48000),
-    AUDIO_SAMPLE_FREQ_4B(48000),
-    AUDIO_SAMPLE_FREQ_4B(0x00),
-    AUDIO_SAMPLE_FREQ_4B(96000),
-    AUDIO_SAMPLE_FREQ_4B(96000),
-    AUDIO_SAMPLE_FREQ_4B(0x00),
     AUDIO_SAMPLE_FREQ_4B(44100),
     AUDIO_SAMPLE_FREQ_4B(44100),
     AUDIO_SAMPLE_FREQ_4B(0x00),
-    AUDIO_SAMPLE_FREQ_4B(88200),
-    AUDIO_SAMPLE_FREQ_4B(88200),
-    AUDIO_SAMPLE_FREQ_4B(0x00),
-    AUDIO_SAMPLE_FREQ_4B(192000),
-    AUDIO_SAMPLE_FREQ_4B(192000),
+    AUDIO_SAMPLE_FREQ_4B(48000),
+    AUDIO_SAMPLE_FREQ_4B(48000),
     AUDIO_SAMPLE_FREQ_4B(0x00),
+    // AUDIO_SAMPLE_FREQ_4B(88200),
+    // AUDIO_SAMPLE_FREQ_4B(88200),
+    // AUDIO_SAMPLE_FREQ_4B(0x00),
+    // AUDIO_SAMPLE_FREQ_4B(96000),
+    // AUDIO_SAMPLE_FREQ_4B(96000),
+    // AUDIO_SAMPLE_FREQ_4B(0x00),
+    // AUDIO_SAMPLE_FREQ_4B(192000),
+    // AUDIO_SAMPLE_FREQ_4B(192000),
+    // AUDIO_SAMPLE_FREQ_4B(0x00),
 };
 
 #if CONFIG_USBDEV_AUDIO_VERSION < 0x0200
diff --git a/demo/audio_v2_mic_dualchan_template.c b/demo/audio_v2_mic_dualchan_template.c
index 4abe8c7b..e6f80804 100644
--- a/demo/audio_v2_mic_dualchan_template.c
+++ b/demo/audio_v2_mic_dualchan_template.c
@@ -14,14 +14,14 @@
 
 #define AUDIO_IN_EP 0x01
 
-#define AUDIO_FREQ 96000
+#define AUDIO_FREQ 48000
 #define HALF_WORD_BYTES 2  //2 half word (one channel)
 #define SAMPLE_BITS     16 //16 bit per channel
 
-#define AUDIO_IN_PACKET ((uint32_t)((AUDIO_FREQ * 2 * HALF_WORD_BYTES) / 1000))
-
 #define CHANNEL_NUM 2
 
+#define AUDIO_IN_PACKET ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * CHANNEL_NUM) / 1000))
+
 #define BMCONTROL (AUDIO_V2_FU_CONTROL_MUTE | AUDIO_V2_FU_CONTROL_VOLUME)
 
 #define USB_AUDIO_CONFIG_DESC_SIZ (9 +                                                 \
diff --git a/demo/audio_v2_mic_speaker_multichan_template.c b/demo/audio_v2_mic_speaker_multichan_template.c
index 382a2ba6..fd71452c 100644
--- a/demo/audio_v2_mic_speaker_multichan_template.c
+++ b/demo/audio_v2_mic_speaker_multichan_template.c
@@ -15,25 +15,26 @@
 #define AUDIO_OUT_EP 0x02
 #define AUDIO_IN_EP 0x81
 
-#define AUDIO_FREQ 96000
+#define AUDIO_FREQ 48000
 #define HALF_WORD_BYTES 2  //2 half word (one channel)
 #define SAMPLE_BITS     16 //16 bit per channel
 
-#define AUDIO_OUT_PACKET ((uint32_t)((AUDIO_FREQ * 2 * HALF_WORD_BYTES) / 1000))
-#define AUDIO_IN_PACKET ((uint32_t)((AUDIO_FREQ * 2 * HALF_WORD_BYTES) / 1000))
-
 #if 1
 #define OUT_CHANNEL_NUM 2
 #define IN_CHANNEL_NUM  2
-#define INPUT_CTRL DBVAL(BMCONTROL),DBVAL(BMCONTROL)
+#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL)
 #define INPUT_CH_ENABLE 0x00000003
 #else
 #define OUT_CHANNEL_NUM 2
 #define IN_CHANNEL_NUM  6
-#define INPUT_CTRL DBVAL(BMCONTROL),DBVAL(BMCONTROL),DBVAL(BMCONTROL),DBVAL(BMCONTROL),DBVAL(BMCONTROL),DBVAL(BMCONTROL)
+#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
 #define INPUT_CH_ENABLE 0x0000001F
 #endif
 
+/* AudioFreq * DataSize (2 bytes) * NumChannels */
+#define AUDIO_OUT_PACKET ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * OUT_CHANNEL_NUM) / 1000))
+#define AUDIO_IN_PACKET  ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * IN_CHANNEL_NUM) / 1000))
+
 #define BMCONTROL (AUDIO_V2_FU_CONTROL_MUTE | AUDIO_V2_FU_CONTROL_VOLUME)
 
 #define USB_AUDIO_CONFIG_DESC_SIZ (9 +                                                     \
@@ -173,11 +174,13 @@ void usbd_audio_close(uint8_t intf)
 
 void usbd_audio_set_sampling_freq(uint8_t entity_id, uint8_t ep_ch, uint32_t sampling_freq)
 {
-    uint16_t packet_size = ((sampling_freq * 2 * 2) / 1000);
+    uint16_t packet_size = 0;
     if (entity_id == 1) {
+        packet_size = ((sampling_freq * 2 * OUT_CHANNEL_NUM) / 1000);
         audio_descriptor[18 + USB_AUDIO_CONFIG_DESC_SIZ - AUDIO_V2_AS_DESCRIPTOR_INIT_LEN - 11] = packet_size;
         audio_descriptor[18 + USB_AUDIO_CONFIG_DESC_SIZ - AUDIO_V2_AS_DESCRIPTOR_INIT_LEN - 10] = packet_size >> 8;
     } else if (entity_id == 5) {
+        packet_size = ((sampling_freq * 2 * IN_CHANNEL_NUM) / 1000);
         audio_descriptor[18 + USB_AUDIO_CONFIG_DESC_SIZ - 11] = packet_size;
         audio_descriptor[18 + USB_AUDIO_CONFIG_DESC_SIZ - 10] = packet_size >> 8;
     }
diff --git a/demo/audio_v2_speaker_dualchan_template.c b/demo/audio_v2_speaker_dualchan_template.c
index 1b35690f..3b4b8c35 100644
--- a/demo/audio_v2_speaker_dualchan_template.c
+++ b/demo/audio_v2_speaker_dualchan_template.c
@@ -14,14 +14,14 @@
 
 #define AUDIO_OUT_EP 0x01
 
-#define AUDIO_FREQ 96000
+#define AUDIO_FREQ 48000
 #define HALF_WORD_BYTES 2  //2 half word (one channel)
 #define SAMPLE_BITS     16 //16 bit per channel
 
-#define AUDIO_OUT_PACKET ((uint32_t)((AUDIO_FREQ * 2 * HALF_WORD_BYTES) / 1000))
-
 #define CHANNEL_NUM 2
 
+#define AUDIO_OUT_PACKET ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * CHANNEL_NUM) / 1000))
+
 #define BMCONTROL (AUDIO_V2_FU_CONTROL_MUTE | AUDIO_V2_FU_CONTROL_VOLUME)
 
 #define USB_AUDIO_CONFIG_DESC_SIZ (9 +                                                 \