Gamma 15/400 Active speakers, The Carlsbro Gamma 15 Series of moulded speaker cabinets demonstrates a marked departure, for Carlsbro, from the traditional speaker cabinet for which we're perhaps more well-known. The range consists of two passive, two-way cabinets, two active, two-way cabinets and one active, one-way bass bin. This model is ideal for live or dj use as they are very strong and portable, not to mension the massive 400 watts of handling power!