You'd think a few of those victimized by AV123 would band together and go after them. Doesn't seem like much of a stretch to be able to show a pattern of fraud here.
Per the OP, the Colorado AG is already after him for fraud, and what's happened with the speakers not being delivered seems like they'd simply be more counts of the same (the first two counts listed specifically). If this happened to you, there's no reason not to send a note with the particulars of your situation to his office.