[. . . ] The amplifier BQX 280 can be connected to car radios with Cinch connector. [. . . ] 1 Ensure that there is enough air circulation at the mounting location for adequate heat dissipation. To avoid possible interference, all cables should be routed at a sufficient distance to the wiring harnesses. Use only loudspeaker connection cables with a cross-section of up to 16 mm2. Power: RMS power: Distortion factor: Frequency response: Channel separation: Signal-to-noise ratio: Inputs: Outputs: Dimensions (W x H x D): Changes reserved 4 x 70 W or 2 x 140 W into 4 4 x 30 W or 2 x 75 W with 0, 1 % THD (DIN 45500) <0. Screw the enclosed positive cable to an interference-free ground spot (chassis screw or plate). The contact area of the ground source must be blank and lubricated with graphite grease. [. . . ] If a car radio of another brand shall be connected, adjust the input sensitivity as detailed in the car radio specification. [. . . ]