i have a pair of RS part #15-1952 A/V selectors for sale. these are used to switch between SACD and DVD-A for people who only have a single 5.1 channel input on their receiver. although i never got around to using them, they are supposed to keep the signal intact without audible degradation. bought both for $30, sell the pair for $12 shipped. need to sell quickly. THESE ARE UNUSED AND UNOPENED IN THE ORIGINAL BOX!