I think it's because of their packaging -- the PCA's come from their factory in two-packs, which works great for people hooking sources to a receiver or pre/pro (one pair for the CD player, three pairs for the DVD-Audio or SACD player, ...). It does leave you with an extra when you are hooking up a five-channel or seven-channel amp, though...

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review