diff --git a/yt_dlp/extractor/rts.py b/yt_dlp/extractor/rts.py
index 09a73c20b..16bc3b17f 100644
--- a/yt_dlp/extractor/rts.py
+++ b/yt_dlp/extractor/rts.py
@@ -11,7 +11,7 @@ from ..utils import (
 from ..utils.traversal import traverse_obj
 
 
-class RTSIE(SRGSSRIE):
+class RTSIE(SRGSSRIE):  # XXX: Do not subclass from concrete IE
     _GEO_COUNTRIES = ['CH']
     IE_DESC = 'RTS.ch'
     _VALID_URL = [
diff --git a/yt_dlp/extractor/srgssr.py b/yt_dlp/extractor/srgssr.py
index 4fec06604..7f85aeac0 100644
--- a/yt_dlp/extractor/srgssr.py
+++ b/yt_dlp/extractor/srgssr.py
@@ -128,6 +128,10 @@ class SRGSSRIE(InfoExtractor):
                     'quality': q(quality),
                 })
 
+        for idx, fmt in enumerate(formats):
+            if fmt['format_id'].endswith('(AD)'):
+                formats[idx]['language_preference'] = -10
+
         if media_type == 'video':
             for sub in (media_data.get('subtitleList') or []):
                 sub_url = sub.get('url')