I am strongly considering the Arcam A-15 but am unable to demo the unit as I live in the US and have no dealers near me. I am bothered by the THD specification where the full power spec is 0.5%. The 1 KHz 80% power THD is spec’d at 0.002%. I emailed Arcam about this but they were not helpful. Based on the recommendation of this site it sounds like a great choice. Can someone explain to me how such a high full power THD value can be justified in terms of the performance of this amp?