Just saw this thread. I have a high resolution system that includes a PARC. The PARC was the only solution, after ASC Tube Traps to reduce a couple of modes at 31 and 62 Hz present in my room due to dimensional causes. The difference in soundstage, transparency and elocution is significant. It does not affect sound quality at all. Bear in mind, however, that it does require careful setup, preferably with a real time analyzer and then some subsequent tuning by ear. Rives Audio provides a system called BARE that utilizes a microphone, laptop, and a soundcard to provide the initial setup. Good luck.
