Once again the ld pro series has been drastically modified and improved in the 30 cm 12 and 38 cm 15 design immediately from start the neodymium woofer and hf driver standard the acoustics were clearly improved by the application of the nd components and new tuning of the speakers with simultaneous reduction of the weight you receive an additional switchable bass boost with 30 cm 12 and 38 cm 15 active varieties which positively influences the sound at low to medium volumes in t