When was the last time you had access to a manual at the dealer/shop or at an ecommerce site?
I haven't been in a dealer/shop in ages, too long a drive from where I live, but a cell phone/tablet can do wonders with a brief search. Then again if a dealer/shop couldn't produce one, doesnt say much good about their knowledge either. On an ecommerce site I just open a new tab and find the manual. Mostly I just don't shop for 2ch integrated amps, not much to find there in the first place.