A better amp is all you need ( I have the S40 also).. and the Pass Int60 is very good. But I end up getting Luxman L590x over it..
BTW I have also tried the Yam AS3000. It is good, but not at the same level as Pass or Luxman.
BTW I have also tried the Yam AS3000. It is good, but not at the same level as Pass or Luxman.