don't go below 20 : http://www.google.com/#sclient=psy&hl=en&source=hp&q=music+decibel+levels&pbx=1&oq=music+decibe&aq=1&aqi=g2g-v3&aql=&gs_sm=c&gs_upl=6757l15171l0l19134l12l11l0l0l0l0l960l3331l0.6.2.5-2.1l11l0&bav=on.2,or.r_gc.r_pw.&fp=165bfefa6b75e1a2&biw=1280&bih=535