Bathroom TV DS-1500HV(B) 15V型YUGA Terrestrial Digital High-Definition Product Number: DS-1500HV(B) [Product Information] Employs a high-quality speaker system with a φ50 speaker and a drone cone, providing high waterproof performance. Even in a bathroom where sound tends to echo, it achieves a sound quality with breadth and depth, and powerful, deep bass. ● Drone Cone: The equivalent mass of the low-frequency reinforcement diaphragm and the spring inside the box resonate, causing it to vibrate greatly at that frequency. Then, at frequencies higher than the resonant frequency, the phase advances and combines with the sound waves from the diaphragm to enhance the bass. Also known as a passive radiator system, the principle is the same as a bass reflex type. Employs a surround system that achieves depth and spacious sound while balancing left and right and near and far. The stereo-compatible φ50mm speaker produces natural and pleasant sound.