Koukame do stejnejch datasheetu? http://www.st.com/content/ccc/resource/technical/d ocument/datasheet/ab/d6/fa/99/84/36/49/ee/CD000000 17.pdf/files/CD00000017.pdf/jcr:content/translatio ns/en.CD00000017.pdf

Ja tam vidim min(zejmena v castech absolute maximum ratings a eletrical characteristics), resp. je tam zminka, ze se z toho da i tech 150W vytahnout, ale musi se zapojit dva do mustku, pro stereo tedy 4 svabi.
THD je total harmonic disortion, tedy nakrmis to skvelym sinem a na vystupu je 90% originalniho sinu a 10% vyssich harmonickejch. 10% je maximum, co unese prumerne hluchej nenarocnej posluchac, aniz by prilis nadaval. Fakt zadny HiFi.