1. Please plug the power cord into the amp then the AC outlet.
Some customers may see some slight sparks flying when they plug the power supply into the amplifier, because they use it in wrong way, you need to connect the amp to the power supply first, then plug the power supply into the 110V AC outlet, don't worry about the sparks, because this is class D amplifier, the capacitors need to charge when the power in, it's normal and safe.
2. The amp will off when you switch off, but it’s normal that the power LED light stay on even switch off, the power LED light on means the power supply in.
3. You can pair with your Bluetooth device when the amp power on. But if Bluetooth connects, playback from the physical input is interrupted. If you want to connect this amplifier with the audio cable(physical input), you need to interrupt the Bluetooth first.(turn off Bluetooth from your Bluetooth device).
4. How to judge whether the noise from the amplifier?
Unplug the RCA cable, connect this amp to speakers, and then plug into the power supply, power on and volume on, hear whether noise exists on speakers, if noise existed, the noise may from speakers or amp, so you need to change speakers for further confirmation. If no noise the noise may from the audio source.
Perfectly suited for your desktop or a smaller space in your home or office, Bluetooth 5.0 Stereo Audio Amplifier is easy to connect to your Mac or PC with no software to install or settings to change. One easy to use power switch turns the on/off, and adjusts the volume, with no need for other buttons or knobs.
Adopt texas instruments TPA3116D2 amplifier chip
Adopt QCC3003 bluetooth chip
Streaming range up to 40ft(12m)
With bass and treble control
With Bluetooth and RCA select
New DC socket, no sparks flying when power supply plug in
Power supply range: 12v-25v
THD: ≤ 0.5%
Frequency Range: 20Hz – 20kHz (±1 dB)
SNR: ≥ 98dB
Input sensitivity: ≤ 280mV
Bluetooth transmission distance: 40ft(12m)
Terminating impedance: 2Ohm – 8Ohm
Output power: 100W + 100W
Input mode: Bluetooth and Analog
Bluetooth Name: BT Speaker
Power supply: 24V/4A 96W
Supplied Accessories: Amplifier, Power supply, AC power cord, Manual
1 x Bluetooth Audio Amplifier
1 x 24V/4APower supply
1 x AC power cord
1 x User's Manual