s ▁ ▁Fre quency ▁response : ▁ 2 0   Hz ▁to ▁ 2 0   k Hz ▁ ▁Ear phone ▁imped ance ▁ 3 2 ▁ Ω ▁( was n ' t ▁tested ▁yet ) ▁ ▁Output ▁power : ▁ 5   m W ▁× ▁ 5   m W ▁( 1 6 ▁ Ω ) ▁( was n ' t ▁tested ▁yet ) ▁ ▁S / N ▁( signal ▁to ▁noise ▁ratio ) ▁around ▁ 7 0 ▁d B ▁[ qu oted ▁as ▁up ▁to ▁ 8 5   d B ▁by ▁some ▁vend ors , ▁known ▁to ▁be ▁no is ier ▁at ▁low ▁volumes ] ▁ ▁FM ▁radio ▁( dep ends ▁on ▁the ▁presence ▁of ▁the ▁Phili ps ▁TE A 5 7 5 6 ▁radio ▁chip ; ▁this ▁chip ▁can ▁handle ▁the ▁FM ▁frequencies ▁of ▁both ▁the ▁US ▁and ▁Japanese ▁commercial ▁FM ▁bands ). ▁ ▁Graph ic ▁equal izer ▁pres ets ▁ ▁Rec ording ▁via ▁built - in ▁micro phone ▁or ▁FM ▁radio ▁in ▁AD PC M ▁W AV ▁( 3 2 ▁k bit / s ▁mon o ▁or ▁ 6 4 k ▁b ps ▁s tere o ; ▁using ▁FF mpeg ▁code c ▁named ▁ad p cm _ ima _ w av ), ▁A CT ▁( 8 ▁k bit / s ) ▁or ▁V OR ▁( 3 2 ▁or ▁ 8 ▁k bit / s ) ▁formats , ▁and ▁ability ▁to ▁play ▁back ▁these ▁files ▁locally ▁or ▁via ▁Windows ▁Media ▁Player ▁when ▁connected ▁as ▁an ▁M SC ▁device .