As in not needing to upgrade any more, nor tweak, because they're happy with what they've got?
I've one upgrade to go, i.e. an amp change, but keep putting it on hold since I'm happy with the sound, to the point where if I try to listen analytically to the system, rather than the music, I can't.
I've one upgrade to go, i.e. an amp change, but keep putting it on hold since I'm happy with the sound, to the point where if I try to listen analytically to the system, rather than the music, I can't.