TACT RCS 2.0 AA Digital/analogue Preamplifier. The RCS 2.0 AA is a two-channel digital device with four analog inputs (up to 24-bit/96kHz A/D) and two analog outputs (24/96 D/A), in addition to the standard digital outputs. The RCS also has the ability to control gain (or, more properly, attenuation), signal polarity (for each channel individually), and select among its digital and analogue inputs. It acts as the preamp/control centre for a full system. The RCS 2.0 was the first build device from Peter Lyngdorf in the room correction theme. I think he sold his part on NAD to research and produce the RCS 2.0. Unlike the current products with RoomPerfects automatic room correction, here you have full control over the process. With room correction, this preamp improves the sound quality in your room. The TACT RCS 2.0 is a high-quality digital preamp that offers exceptional sound quality. Please google it for excellent reviews, including on stereophille. The unit is in used condition, with marks and signs according to its age, please look very well to the photographs, as they are part of the description. No original box, but I will properly box it for no problem safety shipping. No warranties or returns as it is a private sale, still I doubt you will have any kind of trouble. EUROPE SHIPPING ONLY, please do not buy even if the system says so. I can send to other parts if the world, but shipping price must be consulted. Grateful for your consideration. PLEASE SEE MY OTHER ITEMS. Generally, I only sell stuff I care about, and Im willing to use myself.