just opened the speaker cabinet to look whats inside the AD Flex15a the cabinet plastic moulded box is thin, I think to make the overall speaker lightweight or maybe cheap materials were just used. Speaker brand: Accoustic Drive model: Flex15a FIR phase technology with DSP active speaker 15 inches neodymium woofer 3 inches voice coil titanium diapraghm ferrite compression driver with 2 inches exit throat 134db