The NAD T 175 is a standard-definition audio/visual surround-sound preamplifier featuring a Modular Design Construction (MDC) in which the audio and video boards are on removable modules. Featured is support for Dolby TrueHD & DTS-HD Master Audio, Dolby Pro Logic Iix and EARS Processing (responsible for improved two-channel processing), and an advanced VXP video processing engine, though the T 175 limits adjustments to simple variables like noise reduction, contrast, etc.