My friend has an array of Linn Speakers in his surround system. A tweeter has gone out on one of the mains. I don't have the name or model # at hand but checking a dealer online the Kan model looks similar. Anyway, a third party has declared the part irreplacable. Could this be true? I just figured a company like Linn would back up their products for a reasonable ammount of time. Where can I check on this once I do pin down the model #?