I've ripped all my CDs to MP3 (VBR -v2 setting in EAC/LAME) and a few to FLAC. Playing these back on my Sonos Play:3 and Revo Mondo wi-fi (into amp & speakers) seem a lot quieter than playing the original CD on either a separates CD (in to same amp/speakers) or an old panasonic stereo. Is there any reason they would be quieter? I've also noticed more distortion on the MP3s and FLAC files at higher volumes. Is there anything I can do to maintain the original volume?