Description: Adopts TDA7498E dual-BTL power amplifier chip, high power, good sound quality, no distortion, give you a great hearing enjoyment. Output power: 160W+160W (Vcc = 36 V, RL = 4Ohm, THD: 10%); Output power: 1x220W single channel in parallel BTL(Vcc = 36 V, RL = 3Ohm, THD: 10%); High efficiency: 85%. Applicable speaker impedance: 4 ohm, 6 ohm, 8 ohm; Four fixed gain settings available: 29.6 dB, 33.1 dB, 35.6 dB and 35.6dB. Support BTL mode (short J1, J2, J3, J4 located on the back of amplifier board) Specification: Material: PCB Board Color: As Pictures Shown Size: Approx. 109x 79mm/ 4.29x 3.11inch Package Includes: 1 Piece TDA7498E Amplifier Board Note: The color may have different as the difference display,pls understand.= Please allow 1-3mm error due to hand test.