An assumption seems to be that out there, somewhere is 'perfection' and that, using our ears we can eventually track down that perfection. But what if there is no single 'perfection. Or what if there are several 'perfections' no better or worse than each other? If the latter, what if we naturally get bored with a single version of perfection over a relatively short time? What if the only time we truly love what we hear is when it is new to our ears? Must we, in fact, keep changing our systems to keep our ears refreshed?