I spoke to Mr Laxman (Norge) yesterday, as per them they did try testing it however observed loss of signal & even some instances of voltage drops below required limits... some technical insights which i couldn't process with my limited knowledge i.e. 1 out of 5
so to summarise they don't have any plans to install that circuit & he assured there are
no issues (i.e. Speaker damage) reported from customer who have been using these amps for many years now. Hope it helps, I decided & took a plunge to buy Norge Concerto Gold 1000 - order is placed, awaiting delivery