diff --git a/unshackle/commands/dl.py b/unshackle/commands/dl.py
index 9a99bfc..559cfd9 100644
--- a/unshackle/commands/dl.py
+++ b/unshackle/commands/dl.py
@@ -213,7 +213,7 @@ class dl:
     @click.option(
         "--sub-format",
         type=SubtitleCodecChoice(Subtitle.Codec),
-        default="srt",
+        default=None,
         help="Set Output Subtitle Format, only converting if necessary.",
     )
     @click.option("-V", "--video-only", is_flag=True, default=False, help="Only download video tracks.")
@@ -1701,10 +1701,14 @@ class dl:
                 # All DecryptLabs CDMs use DecryptLabsRemoteCDM
                 return DecryptLabsRemoteCDM(service_name=service, vaults=self.vaults, **cdm_api)
             else:
-                del cdm_api["name"]
-                if "type" in cdm_api:
-                    del cdm_api["type"]
-                return RemoteCdm(**cdm_api)
+                return RemoteCdm(
+                    device_type=cdm_api['Device Type'],
+                    system_id=cdm_api['System ID'],
+                    security_level=cdm_api['Security Level'],
+                    host=cdm_api['Host'],
+                    secret=cdm_api['Secret'],
+                    device_name=cdm_api['Device Name'],
+                )
 
         prd_path = config.directories.prds / f"{cdm_name}.prd"
         if not prd_path.is_file():
diff --git a/unshackle/core/manifests/dash.py b/unshackle/core/manifests/dash.py
index ec19e25..56fec08 100644
--- a/unshackle/core/manifests/dash.py
+++ b/unshackle/core/manifests/dash.py
@@ -253,8 +253,8 @@ class DASH:
     ):
         if not session:
             session = Session()
-        elif not isinstance(session, Session):
-            raise TypeError(f"Expected session to be a {Session}, not {session!r}")
+        elif not isinstance(session, (Session, CurlSession)):
+            raise TypeError(f"Expected session to be a {Session} or {CurlSession}, not {session!r}")
 
         if proxy:
             session.proxies.update({"all": proxy})