I did'nt realise that there were many other Privia 400 owners out there and am pleased that there are.
Initially I bought the keyboard to take with a choir where there was not a decent piano and hoped that it would serve as an arranger as well.But I am the primary carer of a wheelchair bound 31 year old son and because of my wife's failing health a month later I had to give up the choir because I could not go out at night.
In my disappointment I brought The PSR3000 which I am delighted to take to my sole performer concerts which take place during the day when my son is not in my care.
With that preamble let me answer your question.
The Samick is an all in one speaker and four channel powered mixer which I hook up the Privia and its microphone outlet to.
The various sounds produced are not in the same league as my beloved PSR3000 but will be good enough to use as back up keyboard.
The sounds through the Samick to me are much richer and fuller.
I use midi through my keyboards as an accompliment to my singing and only play on
the keyboards at home which I don't very well

Cousin Ken