- A100 Bluetooth 5.0 Stereo Audio Mini Class D Amplifier MA12070 Chip 2 Channel Amp Receiver for Home Desktop Speakers 80Wx2

For the price, it's amazing

I bought this due to the efficiency of the the new chip and due to having USB audio. I also purchased a Loxjie a30 (almost double the price) . The biggest issue of the A100 is when using USB audio, if you software mute your computer or accidently turn your volume down to 0, it triggers the physical mute on the device. If you turn your volume back up on your computer, it doesn't un-mute. In order to get back sound you have to press the mute button on the device TWICE, and it takes a few seconds. Very annoying and finicky. The Loxjie A30 despite having the same chip is more efficient. It uses 1.5 watts idle and 2 watts during desktop listening. The a100 uses 2 watts idle, and 5 watts during use. The A100has a blue light that never turns off. The loxjie can go completely dark. The A100 does have a a few pros over the Loxjie. - buit in power supply - easier to change inputs - easier (when placed below your desk) to see/change volume - When unplugigng usb the Loxjie will slightly buzz the speakers. The A100 is silent Besides that the Loxjie has more advertised features that you pay for. Remote, color screen, optical in, equalizer. metal body, higher quality bluetooth, & higher quality DAC (though I couldn't tell the difference). If it weren't the the mute issue I would have kept the A100.

I recently decided to update my entire desk setup by going minimal and power efficient. I got rid of my old gaming PC and my receiver and replaced them with a mac mini m2 and this amp. The new setup works just as well if not better than my old setup. I was hesitant to move from class a/b to class d but this new generation of class d amps sound great. It might be imagination but my BIC speakers sound a bit more punchy compared to using the old receiver setup. Could not be more pleased. There's no more waste heat that's always coming from the top of my receiver and the mac mini sips electricity at less than 5 watts during normal usage. This cut my computer usage power budget by 80%. EDIT: after using for a few weeks, I have noticed that with the volume past 50%, the amp is very noisy. So noisy that it clips without any input. I wish they just didn't allow that volume to be set, I have never actually turned it up past 25% when actually listening to anything because of how loud it gets. In the meantime, maybe avoid this amp if you have muscle spasms or if many other people have access to the volume knob. I can see these blowing out some speakers if cranked to 100% while music is playing. It clips pretty badly - yet somehow low volumes are completely fine.

All in all I'm super pleased with this amp. It runs cool, feels sturdy, and sounds good. My one complaint is that the volume knob is way too non-linear and has a really narrow useful range. A slightly slower knob response would be appreciated.

Basically what my headline says. For a 100 usd amp, you get enough power and supplied with a non bluetooth source, it sounds really good, especially with a sub out :D However, when I pair my phone with it, I cannot walk 8 feet away without the bluetooth disconnecting. I have to leave the phone next to the amp if i want to listen to anything on my phone. Do not buy. I had the same problem with the SMSL AD18. Great power and sound, terrible bluetooth.

This is a great little amp. I didn't know what I was missing before with the old T amp that I was using. Connecting via USB is really nice. Only problem is when muting on my computer I have to press the mute button on the box to go back to sound. Would be nice if there was some sort of software update for this. Overall very happy with the purchase.

We bought this to drive a speaker for a test fixture. The harmonics (distortion) on the output were unacceptable even when driving at low volumes. We had other amps on hand and confirmed this amp was the source of distortion.

UPDATE 4/30/2024: The S.M.S.L. support team reached out after my first review (plea for help). They were polite and helpful.They asked for a video of the issue and once reviewed they immediately initiated a return/replacement. There was no cross-shipping, but once the returned unit was verified, the replacement showed up in just a few days. They also promptly refunded the return shipping. The unit works as expected. I am primarily using the USB input, but have tested the RCA and BT as well. The device also looks nice. Previous review: The S.M.S.L store front requests that if customers encounter issues, we should post a message to them. Unfortunately, I cannot see any email or path to contact their support. In regards to the hum/static on the RCA input: The other inputs work well (usb and BT). I've tried multiple cables w/out any luck. I tried the same setup (cables and source) using another amp w/out an issue. How can I get support? Thank you.