Overall, I’m very impressed with the unit - it doesn’t get hot or prevent it from staying on all the time, takes up very little space, and at least with my setup I can listen to music and watch movies from the laptop without having to turn it on and off every time the amplifier. The sound quality is much better than my previous amp which was part of a multi-component system. The speakers reproduce a much cleaner sound, the dynamics are better, the bass is much cleaner. One of the main pluses is that there is no annoying static noise, which after replacing my old amplifier with the Fosi Audio one disappeared. What truly sets the Fosi Audio BT20A Pro apart is its remarkable audio performance. With 300 watts per channel, it delivers a powerful and pristine sound that is very pleasant for my ears. Whether you’re immersing yourself in music, enjoying a movie night, or gaming, this amplifier consistently reproduces sound with depth, clarity, and accuracy. It gracefully handles a wide spectrum of audio frequencies, ensuring that every note and sound effect is crystal clear. This essentially means that you can enjoy multiple genres of music, and all the details will be remarkably well presented.

Sound Control: With its unique design, the BT20A Pro amplifier for home audio has a wide range of bass and treble controls. Alternatively, you can turn the treble and bass effects to a middle point to listen to the original sound without effects.The signal to noise ratio of about 70 dB is a value we would like to recommend the manufacturer to work on.

While the included 32-volt supply works well, given the small upcharge I would recommend going with the larger 48-volt supply.

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As for the turntables which have a built-in preamp, the switch must be set to LINE before connecting BT20A. Of course, it doesn’t sound as muscular or insightful as a higher-tier product or quite as organic as a good Class-A amplifier but I think it sounds great relative to its low price. Playing through Carbon Based Lifeforms’ “Interloper”, my speakers were filling the room with rich yet tight bass and the synthesizers were swooping around me in all directions. This nicely lands the BT20A Pro in the "very good" category of all amplifiers tested regardless of price: Inside the BT20A Pro you will find a Texas Instruments TPA3255 Class-D amplifier chip and four TI NE5532 Op-Amp chips. While two of the four chips are soldered onto the board, the other two can be replaced. Fosi lists the compatible replacements, which include the LME49720HA, MUSES02 120-140, OPA26041P, OPA2134PA 25-35, LM4562 and NJM4556AD. That gives you a huge variety of customization, if you so choose. How does this little budget amplifier perform? Pretty well it turns out. This tiny guy has a lot of power on tap and it can easily drive most bookshelf speakers with ease. Sure, its measurements aren’t anything to write home about but they’re perfectly acceptable for the price.

Take a moment to tweak the treble and bass controls once you’ve fired up some music. I found that right in the middle on both the treble and bass works best for me but it will depend on your speakers and your individual preference. This is the type of amp that can do a lot of things for you. This amp’s main goal was to create an easy, enjoyable and hassle-free experience right out of the box. With its size in mind one can see how it can be the best mini stereo amplifier. Our hearts are taken by this amplifier. Make sure that the distance between your device and BT20A is not too long, close your device to BT20A to have a try.The little BT20A had no trouble powering my NHT C3 speakers and had heaps of power to spare. As a result, the bass was full-bodied and tight (even with the tone set to neutral), the midrange was clear and the treble lively and detailed. With the Tone controls enabled it was able to get a nice sound in my listening space without EQ - I typically just need to lower the treble a little for my own tastes. I can capture some comparisons if people are interested of the max / min of both the bass and treble dials. Fosi presented themselves with a bit of a challenge, as the BT20A Pro needs to beat the already impressive TB10D. Once again Fosi proved surprisingly capable at providing HiFi performance at a LoFi cost. It was immediately noticeable that the left and right channels had far superior separation, and not just by a little. The surround effect was far more immersive than on the TB10D during movies and music.

If your Bluetooth microphone is a Bluetooth transmitter, then yes. This amplifier is the Bluetooth receiver amplifier. The BT20A Pro draws only 2.5 Watts of power during idle.Also, it barely gets warm even when driving speakers for long periods of time. The best modern electronics are far more energy efficient that amps from the past. This Fosi sips power, which is nice. Next, we have an entire bunch of inexpensive amplifiers coming from under the same roof. They really go close to each other, especially considering their prices. On the other hand all of them have distinctive features that make them serve same purposes, but with different flavors. Fosi Audio BT30A is a mini amp that can probably go first, because it shows a good balance between power and frequency. Fosi Audio BT30A gives 50 watts per channel, which is pretty good for a small unit like that plus a 100 watt for a subwoofer channel. It only weighs less than 2 pounds and small in size, so it can fit on a desk or a shelf with no issue. It can also be moved around easily, because protected by durable aluminum casing. It is also nice to see so much power coming out of this little box with the beefy 48 volt power supply, showcasing the advancements in amplification density we have today.Its a much smaller box than the A07 Pro - so heat might be a problem if played loud for a long time - I imagine if op-amps are swap maybe some extra vents would be drilled into case Make sure there are no obstacles between your device and BT20A, obstacles will affect the Bluetooth operation distance. Notice the great channel match in addition to very good SINAD which represents noise and distortion. Same is true with 32 volt supply: I tried the amplifier with two purposely built studio speakers and reproducing acoustic recordings manly of serious music, with power outputs lower than 20 W RMS. The overall harmonic distortion was lower than 0,5 % as claimed by Fosi, which enabled a pleasant reproduction of the stringed instruments. The intermodulation distortion (IMD), which confuses the sound of multiple sources, was more noticeable, especially with ensembles of chords or human voice choruses and this was to be expected since the class D amplifier chops the audio signal. Actually the IMD is present in most of the commercial speakers which do not have treated surfaces inside, making it more difficult to distinguish the amount attributable to the amplifier from that produced by the speaker.