Integrated Amplifier for Monitor Audio Silver S2 Speakers

Hi Al,
Very good suggestions from you that are cost free and simple to do. His speakers seem capable of reasonable detail with a better quality amplifier.  Note Djengan's description of the sound when the Accuphase replaced the NAD. Definitely more detail/better sound quality   extracted.  So  it appears that these speakers have potential that's exploited with the use of a superior power amplifier. 

+1 Mb 1 audio, oh so true regarding price/performance. 
Charles 

Hi djengan, 
I'm in agreement with Viridian,  amplifiers do make a significant difference.  You've already proven this fact with the Accuphase amplifier placed in your system,  clearly superior sound to the NAD.  Electronics make a considerable impact.  It isn't just about the speakers,  yes they're important but tend to be over emphasized in my opinion. I've heard numerous examples where upgrading an amplifier resulted in significant sound quality. Can speakers do this? Of course,  but so can power amplifiers. 
Best Wishes, 
Charles 

Djengan,
Roxy54 who posted above has very good ears and taste IMO. The Sugden A21 SE he recommended is worthy of more scrutiny.  A solid state pure class A amplifier noted for really fine sound quality  (very organic and sophisticated). Built with exceptional parts quality. 
Charles