Conventional wisdom has it that you should listen to an audio component, preferably in your own system, before you decide to buy it. But who, these days, has the opportunity to do this consistently? Even an audition in the store isn't guaranteed; I have to drive two hours to get to the nearest dealer with decent customer service and a good inventory of interesting gear. And though he generally stocks a fairly wide range of components, like any dealer, he carries only a small sample of all the hi-fi gear that's currently, in principle, available.