The sound from the RCD/RNS510 power amplifiers remind me of what one heard from germanium transistor amplifiers before the advent of silicon ones. Pretty awful.
The standard loudspeakers do an excellent job with the RCD310.
I would, from what I have heard and if sound quality is paramount, never recommend these units without the assistance of separate amplification.
Even with the help of a better amplifier, installing a sub-woofer does improve the musicality of the system.
