diff --git a/config/AISHELL3/preprocess.yaml b/config/AISHELL3/preprocess.yaml
index 2aebb2ab3c..59988642d6 100644
--- a/config/AISHELL3/preprocess.yaml
+++ b/config/AISHELL3/preprocess.yaml
@@ -13,7 +13,7 @@ preprocessing:
     language: "zh"
   audio:
     sampling_rate: 22050
-    max_wav_value: 32768.0
+    max_wav_value: 32767.0 # np.iinfo(np.int16).max
   stft:
     filter_length: 1024
     hop_length: 256
diff --git a/config/LJSpeech/preprocess.yaml b/config/LJSpeech/preprocess.yaml
index 8d5364aad0..812448157a 100644
--- a/config/LJSpeech/preprocess.yaml
+++ b/config/LJSpeech/preprocess.yaml
@@ -13,7 +13,7 @@ preprocessing:
     language: "en"
   audio:
     sampling_rate: 22050
-    max_wav_value: 32768.0
+    max_wav_value: 32767.0 # np.iinfo(np.int16).max
   stft:
     filter_length: 1024
     hop_length: 256
diff --git a/config/LibriTTS/preprocess.yaml b/config/LibriTTS/preprocess.yaml
index b8429b6092..e28eb048ab 100644
--- a/config/LibriTTS/preprocess.yaml
+++ b/config/LibriTTS/preprocess.yaml
@@ -13,7 +13,7 @@ preprocessing:
     language: "en"
   audio:
     sampling_rate: 22050
-    max_wav_value: 32768.0
+    max_wav_value: 32767.0 # np.iinfo(np.int16).max
   stft:
     filter_length: 1024
     hop_length: 256