ricplaya, when you speak of complimenting the ads 570, are you talking about running another pair of speakers in order to augment the bass? if so, i'd simply get a sub, which will hightlight rather than murk up the high frequencies. if for some reason you feel compelled to run more than one pair of speakers, i'd stay in the ads family so that at least the drivers will have similar sonic characteristics. as for the hpm100s, i own some and (like jig) think they're tons of fun, if not esp. accurate.