The Beston RT003C's low-mass aluminum diaphragm and high strength/low weight neodymium motor deliver incredible articulation and transient attack. Frequency response actually extends to 40 kHz! The tweeter is ideal for applications demanding compact size, high efficiency, and maximum fidelity. A third order (18 dB/octave) or higher crossover is recommended to achieve maximum power handling. Minimum recommended crossover frequency: 4,000 Hz