'Again, Odyssey can best advise you what to do.'
Actually, it was Klaus at Odyssey who recommended this. I have had only good experiences dealing with him over the years but wondered what the conventional wisdom was, if any. As with many issues with this hobby, opinions appear mixed.
'It never is but, as you say, he's so used to the gradual decline he can't hear it.'
My hearing has probably declined in synch with the amp.:)
Jim