The Ruby has one of the best DACs ever built into a CD player. You should pair it with a much better integrated amp or a preamp/amp combination to unveil its sound potential. A Ruby is an affordable sibling of the 10 flagship series by Marantz. So don't degrade it by using it in an average system. It deserves the best partners you can afford, for example the dedicated Ruby amp. Loudspeakers? High solution preferred because those Ruby machines are hires specialists...
Greetz, Hans
Greetz, Hans