diff --git a/src/media-generator.test.ts b/src/media-generator.test.ts
index 90276a8f..f7fcb876 100644
--- a/src/media-generator.test.ts
+++ b/src/media-generator.test.ts
@@ -168,7 +168,7 @@ test('generateAudio normalizes sentence audio by default', async () => {
     await generator.generateAudio('/video.mp4', 10, 12);
 
     const args = readFfmpegArgs(argsPath);
-    assert.equal(args[args.indexOf('-af') + 1], 'loudnorm=I=-18:TP=-1.5:LRA=11');
+    assert.equal(args[args.indexOf('-af') + 1], 'loudnorm=I=-23:TP=-2:LRA=11');
   });
 });
 
diff --git a/src/media-generator.ts b/src/media-generator.ts
index 683137b4..09e0e267 100644
--- a/src/media-generator.ts
+++ b/src/media-generator.ts
@@ -24,7 +24,7 @@ import { createLogger } from './logger';
 import { normalizeMediaInput, type MediaInput } from './media-input';
 
 const log = createLogger('media');
-const AUDIO_NORMALIZATION_FILTER = 'loudnorm=I=-18:TP=-1.5:LRA=11';
+const AUDIO_NORMALIZATION_FILTER = 'loudnorm=I=-23:TP=-2:LRA=11';
 
 export type { MediaInput, MediaInputOptions } from './media-input';