Fosi Audio BT20A Bluetooth 5.0 Stereo Review + (Alternative)

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It is almost certain that a power amplifier is included in the audio signal chain if you are listening to sounds from loudspeakers. The amplifier is most likely incorporated inside the active speaker if it is hidden. A power amplifier is necessary if the speaker is passive. The latter of the two cases is the subject of this essay.

An audio setup’s power amplifier(s), such as BOSS Audio Systems, is crucial for attaining the greatest results. It’s important to choose the correct amplifier selection for your loudspeakers and entire sound system. When selecting a power amplifier, there are a ton of alternatives available. Soundavo PSB-400DSP is the finest solution if you want something less expensive. The best and most well-known amplifier for home theatre, Fosi Audio BT20A Bluetooth, will be discussed in this post.

Fosi Audio BT20A Bluetooth 5.0 Stereo 2

Fosi Audio BT20A Bluetooth 5.0 Stereo Review

The Fosi Audio BT20A subwoofer amplifier’s characteristics make it obvious that it is capable of greater performance than previous Fosi subwoofers. Fosi Audio’s subwoofer amplifier comes with a polypropylene cone filled with silica. You can get much more bass out of your system using this cone. It also helps to reduce the amount of unwanted noise that the power amplifier emits.

According to one’s perspective, it is made of aluminum and fiberglass. An ideal balance between these components ensures that the system performs flawlessly. The amplifier includes several vents and ventilation as well.

My computer’s Dragonfly black DAC is linked to a set of 4-inch bookshelf speakers powered by this amplifier at work. It sounds great in a near-field configuration at work-appropriate volumes, but I never turn the volume knob’s indication past 8 o’clock since it’s so loud.

People who invest thousands of dollars on audio amplifiers claim that these tiny ship amplifiers sound fantastic at low volumes but break down when their output power increases by more than 50%. I may bring it home and test it out with my speakers in the living room at some point shortly. However, you can try pushing it harder to see how it performs in a far-field desktop setup.

Fosi Audio BT20A Goods and Bads


The Good

  • Durably constructed aluminium alloy enclosure
  • High power output efficiency
  • Enhanced DC outlet

The Bad

  • It is only 100W

How I tested this amplifier?

I tested the amplifier with two studio-built speakers and mostly serious acoustic recordings, with power outputs of less than 20 W RMS. Fosi said that the overall harmonic distortion was less than 0.5 percent, which made it possible for stringed instruments to sound good. Intermodulation distortion (IMD), which muddles the sounds of multiple sources, was more noticeable, especially in groups of chords or human voice choruses.

Fosi Audio BT20A Bluetooth 5.0 Stereo 1

This was expected since the class D amplifier chops the audio signal. The IMD is in most commercial speakers that don’t have treated surfaces. This makes it harder to tell how much of the sound is coming from the amplifier and how much is coming from the speaker.

  • Durably constructed aluminium alloy enclosure
  • High power output efficiency
  • Enhanced DC outlet
  • Only 100W

Product Comparison:

Fosi Audio BT20A Bluetooth has bluetooth connectivity with an attractive design. Soundavo PSB-400DSP has high power wattage as compared to Fosi Audio BT20A. Fosi audio has an excellent chip with sound clarity and good for home theatre subwoofer. And also it has high performance so; it would a great option for you buy.

Final Verdict:

This is the IDEAL answer for home audio—high-quality audio from my MAC. Anyone who purchases genuine Fosi Audio BT20A would likely be astonished by this small unit’s performance. It wouldn’t completely replace my hi-fi amplifier, but it’s close. Forget the “computer speakers” selection if you need sound from your MAC or PC and are on a tight budget. They are mostly indigent. Purchase this amplifier and some quality hi-fi speakers. You won’t be sorry. I’m in awe and ecstatic about it!

Relevant Questions

What is the difference between a receiver and an amplifier?

A receiver has a built-in radio portion, whereas an amplifier does not. This is the primary distinction between a receiver and a “normal” integrated amplifier concerning sound systems. Therefore, all amplifiers (with radio functionality) are theoretically receivers, but not all are amplifiers.

What does bridging an amplifier do?

A stereo pair of channels can be bridged into a single mono output channel in an amplifier. Bridging is frequently used when powering larger passive in-room or in-wall subwoofer speakers or huge full-range speakers in a two-channel system or home theatre.

Does bridging an amplifier reduce sound quality?

The metrics (THD, damping, power bandwidth, etc.) will be slightly worse off, but not significantly enough to guarantee that you will hear a change. You may have an issue if your main channel speaker is rated at 4 ohms, but your amplifier is only stable into 2 ohms in stereo mode.

What is the difference between a preamplifier and a power amplifier?

A power amp amplifies the line level signal before it is sent to the speakers after being amplified by a preamp to bring it to line level. In other words, a preamp boosts signal intensity to a level that can be sent to the devices in your chain.

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