Interesting to hear your input Mandotim. As well as bands using them as personal PA I've also come across DJs using them as they would a conventional PA only much lighter, less intrusive etc. The acoustic theory is spot on but not new, think back to the 60s when every big club had its columns of 6 or more 8" drivers on the wall at each side of the stage! Those system worked incredibly well despite their very low power ratings by todays standards.