ZK-502E 50W*2 High and Bass Adjustment Preamp Audio Power Amplifier Module Subwoofer Bluetooth 5.0 Dual-channel Stereo w

Specifications Input power voltage DC12 24V current above 5AAmplifier output MAX 50W 2 24V 4ohmSpeaker parameters 4 8ohm 20 100WInput sensitivity 800mVSignal to noise ratio 90dBFrequency response 20Hz 18KHzBare machine size 103mm 88mm 30mm not including the height of the knob seat Package weight about 335gPacking size about 160 155 73mmInstructions 1 Connect the power amplifier output to the speaker or speaker R connect to the right channel and L connect to the left channel note that the polarity of the speaker is not reversed the sound will be muddy if it is reversed 2 Connect to the power supply the power supply can only be connected to direct current the voltage should not exceed 25V and the nominal 24V battery pack should not be connected 3 Turn the volume knob clockwise to turn it on there will be a Bluetooth notification sound and the blue light flashes at this time 4 Choose the audio input mode that suits you to input audio The audio input mode can only be selected from one of three and cannot be activated at the same time The audio input mode can be automatically recognized automatically recognized with priority USB inputAUX inputBluetooth input or manually switched when multiple audio is connected at the same time long press the pause play button to switch the audio input mode 5 Rotate the volume knob treble knob and bass knob to adjust the volume and treble and bass gain to appropriate positions Package includes 1 x Amplifie