AIYIMA A1001 Color:Black with no Power Supply but it will be obvious

but it will be obvious after the amplifier is amplified

0 passive speaker+Sub

No switch sound7

and listen to the noise in the speaker

Because the digital function has a filter capacitor inside

AIYIMA A1001 Color:Black with no Power Supply but it will be obviousDescriptions: Power100W 2ohmFull frequency response 20Hz 20kHz(3dB), BASS cut off frequency adjustable. The speaker matches the impedance2 8Number of Channel: MonoWorking Voltage DC12 24VTHDOutput 1W@ 0. 03%SNR106dBInput sensitivity0. 2mVDimension: 118. 5*98*33MM(without protruding knob section)Bass cutoff frequency range adjustment: 40 300HzControl: Potentionmeter knob and toggle switchAudio input: RCAAudio outout: Gold plated interfaceSlope of bass