Fjn: yes I agree with Vinyljh, Shindo does NOT sound like Marantz. I believe you may be confusing it with Cayin, as they have some amps that are supposed to sound like the vintage Marantz and some like McIntosh. Cayin makes good value products, but its not in the same league as Shindo.
When you say mid-efficiency speakers, what sensitivity are you talking about?
When you say mid-efficiency speakers, what sensitivity are you talking about?