Finally got through to Doug:
ACM HD-P2 is the Warm Mod version of the HD-P2, as realted to the UA5s.
TCM HD-P2 is the Tranparent Mod version of the HD-P2, as related to the UA5s.
No functions or features are disabled or removed with the HD-P2 mods.
Price variance has been fixed, $1175 for ACM delivered.
Terry