Some good points made. Yes, I think that standing reasonably close to the cab did "protect" me from the sound a fair bit. Also the sheer quality and richness of the RV's tone made sure there was no harshness at all.
I don't think it's a faulty amp - I have been reading on the Orange forum that Orange's are fairly quiet for their stated wattage.
Anyway, it was nice to be able to play the amp right in it's sweet spot for the whole gig, with no attenuation. Simply great tone.
Even so, I'm sure my 50W Plexi at the same settings would have been deafening !