Need Suggestion On Preamp & Amp

Hi All,

I just bought ML Impression 11a. Need Suggestion if I need Preamp & Amp both or Just a good power amp is enough.
Please let me know your thoughts. 
I think we need to know a few things.Budget?How big a listening room & how loud you normally listen?Is or are you going to acoustically treat?
 If I read the brochure correctly the Built In PreAmp/Room Correction is for BASS only so looks like you need a complete front end,ie:Amp/PreAmp or Integrated amplifier..Do you have a source or do you need something with built in DAC/Digital Control?