How to make sound less detailed with warmth?

Hello All,

I am quite new to audio stuff... just been listening to my current set up for about a year.

CD Player: RCD-1072
Preamp: Sonic Frontier SFL-1
Poweramp: BK M-200 Sonata Series
Speaker: Thiel 1.3
Cable: Not sure...

I liked detailed sound at first but now I am more into musical and warm sound. It becomes a pain when I listen to violin on my current system. So my question is which part should I change to make my system sound more musical?

One more question: My BK M-200 Power amp just died on me. Is it a wise decision to send the unit back to B&K or get it fixed here?!?! Please let me know.

Thank you!