TS-152, best combination of 15-inch high-power low frequency exchange energy utensil and 44 core titanium metal alt, extraordinary power output satisfies any sound reinforce requirement in any place. 15-inch bass speaker with 4ohms impedance and 100dB sensitivity. 40Hz to 20kHz frequency response. 90° horizontal symmetry and 45° vertical symmetry. 18mm high density board with black and ash gray spray paint surface.