diff --git a/wechat_ipad/client/message.py b/wechat_ipad/client/message.py
index c1b3109..57296fc 100644
--- a/wechat_ipad/client/message.py
+++ b/wechat_ipad/client/message.py
@@ -338,13 +338,13 @@ class MessageMixin(WechatAPIClientBase):
             audio = AudioSegment.from_file(BytesIO(voice_byte), format="amr")
             voice_base64 = base64.b64encode(voice_byte).decode()
         elif format.lower() == "wave":
-            audio = AudioSegment.from_file(BytesIO(voice_byte), format="wav").set_channels(2)
+            audio = AudioSegment.from_file(BytesIO(voice_byte), format="wav").set_channels(1)
             audio = audio.set_frame_rate(self._get_closest_frame_rate(audio.frame_rate))
             voice_base64 = base64.b64encode(
                 await pysilk.async_encode(audio.raw_data, sample_rate=audio.frame_rate)).decode()
             voice_type = 4
         elif format.lower() == "mp3":
-            audio = AudioSegment.from_file(BytesIO(voice_byte), format="mp3").set_channels(2)
+            audio = AudioSegment.from_file(BytesIO(voice_byte), format="mp3").set_channels(1)
             audio = audio.set_frame_rate(self._get_closest_frame_rate(audio.frame_rate))
             voice_base64 = base64.b64encode(
                 await pysilk.async_encode(audio.raw_data, sample_rate=audio.frame_rate)).decode()