Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers
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Availability:
In Stock.
Arrives
Saturday, May 23
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Features
- 300 Watts x 2 Power Output: The TI TPA3255 chip amplifier has a feedback design and high-speed gate driver error connection for efficient and quality audio performance, with a low idle loss of <2.5W
- High-Efficiency: The chip amplifier has replaceable Op-Amps for a custom approach when compared to the BT20A amplifier. Further, you can swap the 2 plug-in NE5532 Op-Amps for LME49720HA, MUSES02, OPA2604AP, OPA2134PA, LM4562, or NJM4556AD Op-Amps to achieve distinct sound qualities. It boasts an SNR108dB and THD0.005%
- Bluetooth 5.0 Connectivity: The Bluetooth pair can be removed by pressing and holding the volume control for 5 seconds, and it also has a memory function for easy pairing and an alert tone for convenience
- Custom Sound with Bass and Treble Controls: The BT20A Pro home audio amplifier has a sound control design so that you can experience sound without effects by setting treble and bass effects to the middle point
- Package Contents: The package contains a BT20A Pro power amplifier, a Bluetooth antenna, a 32V/5A power adapter, an AC cord, and a user manual
Features
- TI TPA3255 Chip Amplifier with 300 Watts x 2 Power Output: Advanced feedback design and high-speed gate driver error correction for efficient and high-quality audio performance, with low idle losses of <2.5W.
- Upgraded High-Efficiency: A significant upgrade from the BT20A amplifier with replaceable Op-Amps for customized. You can replace the two plug-in NE5532 Op-Amps with LME49720HA/MUSES02/OPA2604AP/OPA2134PA/LM4562/NJM4556AD Op-Amps to achieve a unique sound quality. With SNR108dB and THD0.005%.
- Enhanced Bluetooth 5.0 Connectivity: The Bluetooth pair can be cleared by pressing and holding the volume control for five seconds. In addition, it has a memory Function for Easy Pairing and Alert Tone.
- Customizable Sound with a Wide Range of Bass and Treble Controls: The BT20A Pro home audio amplifier offers a unique design for sound control. Enjoy original sound without effects by setting treble and bass effects to the middle point.
- What you Get: BT20A Pro Power Amplifier x1, Bluetooth Antenna x1, 32V 5A Power Adapter x1, AC Cord x1, User Manual x1, our worry-free 24-month warranty, and friendly customer service.
Product Dimensions: 5 x 5 x 1 inches
Item Weight: 2.42 pounds
Item model number: BT30A
Is Discontinued By Manufacturer: No
Date First Available: October 27, 2017
Manufacturer: Fosi Audio
Item dimensions L x W x H: 5.59 x 4.21 x 0.16 inches
Voltage: 32 Volts
Manufacturer: Fosi Audio
Maximum Supply Voltage: 32 Volts (DC)
Minimum Supply Voltage: 32 Volts (DC)
Item dimensions L x W x H: 5.59 x 4.21 x 0.16 inches
Voltage: 32 Volts
Manufacturer: Fosi Audio
Maximum Supply Voltage: 32 Volts (DC)
Minimum Supply Voltage: 32 Volts (DC)
Mounting Type: Surface Mount
Brand: Fosi Audio
Number of Channels: 2
Output Power: 300 Watts
Package Type Name: box
Specification Met: [If Interpreted as Technical Specifications] Bluetooth 5.0
Product Dimensions: 5.59 x 4.21 x 0.16 inches
Item Weight: 2.42 pounds
Item model number: BT20A PRO
Is Discontinued By Manufacturer: No
Date First Available: December 22, 2018
Language: English
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, May 23
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I bought this little gray superhero after my previous “mystery box” amplifier (buried deep inside my outdoor BBQ island like some kind of archaeological artifact) decided to cut in and out every time I turned the music up past “mellow backyard vibes.” Nothing kills a good afternoon faster than your speakers crackling like they’re coughing up dust. 📦 First Impressions This thing is tiny. Like “did they ship me the right item?” tiny. But don’t let the size fool you — it punches like a heavyweight. Bluetooth range? Strong. Power? More than enough to drive the 6.5” Aquatic AV outdoor speakers I already had wired in. 🔧 Installation (AKA: How I Crawled Into My BBQ Island and Survived) My previous setup looked like NASA mission control. Wires, harnesses, proprietary connectors, and something pretending to be a subwoofer box. The Fosi made the whole thing simple: • Speaker wire → into left & right terminals • Power adapter → plug • Bluetooth → connect • Music → immediate happiness No proprietary weirdness. No random 4-pin blue plug. No tears. 🎵 Sound Quality Compared to my old Aquatic AV amp, which acted like it had seasonal allergies, the BT20A Pro is clean, strong, and shockingly loud for its size. • Bass is smooth (especially with your speakers’ built-in low-end) • Highs are crisp • Mids are clean • And the bass/treble knobs actually do something instead of just pretending Honestly, for a backyard setup that sits in a protected cabinet, this little thing is the perfect “sweet spot.” 📡 Bluetooth Fast pairing. Zero drama. I walked almost to the front yard before it even hinted at disconnecting — which, for anyone with an outdoor entertainment setup, is basically sorcery. 🔥 The Verdict If you want: ✔ A simple, clean replacement for a dead factory amp ✔ Power that actually moves your outdoor speakers ✔ Bluetooth that doesn’t quit ✔ A device that you can install without needing an engineering degree ✔ Something small enough to hide anywhere …then this is exactly the amp you want. 😂 Bonus Humor Section My old amp weighed 10 pounds and sounded like it had asthma. This Fosi weighs nothing, and sounds like it drinks pre-workout. ⸻ ⭐ Bottom Line: For the price, size, and performance, this little amp is the MVP of my backyard. If Fosi ever makes a “Pro Plus Ultra Nuclear Edition,” I’ll be first in line — but until then, this thing is staying right where it is, working flawlessly while I grill, chill, and pretend I’m an audio engineer.
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Reviewed in the United States on December 8, 2025 by Kevin Ely
Great Little Integrated Amp! Very well made of all metal. Easy to assemble and set up. Bluetooth was easy to connect and works great. This little amp has lots of power and sounds great. Runs warm but not hot. A great inexpensive alternative to large, more expensive integrated amps.
Reviewed in the United States on October 12, 2025 by KPH
I admit that I have little knowledge of audio And electronics. I thought 300 watts of audio power had to come from a big heavy expensive amp. My new house came with 8 ceiling speakers . I had no idea whether they worked or sounded decent. The previous owner left an AVX speaker selector next to a bunch of speaker wires that were coming out of a wall port. I called Cambridge Audio and an advisor told me I would need to buy an amp costing at least $600 to run the speakers. Since I had no idea how it would sound , i looked on Amazon for an alternative. I took a chance on this tiny inexpensive Fosi amp to see if the setup even worked. It turns out that 3 of the 4 zones work and each sounds great using my phones Bluetooth and Apple Music through the Fosi into the speaker selector . I am being cautious with this setup , but I have determined that I can definitely power three zones simultaneously at rockin’ volume. The bass is not earth shaking , but is ok. I am amazed at the sound . Since the speaker selector has an impedance protector switch, I am relatively certain that I will be able to run 3 zones simultaneously without blowing out the speakers. I think the Fosi Amp is great . I am not audiophile and have reasonable expectations. The amp has an 18 month warranty. It is tiny and the Bluetooth is so strong that I do not have to leave my phone next to the amp. I highly recommend this tiny Bluetooth amp.
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Reviewed in the United States on August 27, 2025 by Paul Klapper
Easy to setup, boosts power from a home-built desktop just as expected. It's got the bass and treble, and a extra EQ software on my desktop allows the sound to flow out with richness and ease. Well worth the cost, it does exactly what I wanted it to. Don't underestimate -- size doesn't matter!
Reviewed in the United States on January 7, 2026 by Eric
Rather nice ittle amp with great specs. The power brick it came with was the 32v/5A. It can take a 48/5 power brick, which is strongly preferable. For one thing, cleaner, "effortless" bass, even at lower volume, and you get more distortion free watts. important: Buy it with the 48v PSU, from somewhere where you can chose that option. With that, it would be 5 stars . the stated wattage is optimistically stated. The usable wattage will be limited by the amount of distortion you can tolerate. With 8 ohm speakers, and the 48v brick, I guess you get maybe a clean 50W per channel, maybe. little more. The Amazon description may lead you to think that it comes with the 48v power brick, because it mentions 48v. What that really means, this unit "can take" up to 48v power. You may want high efficiency speakers with this. I use Infinity IL10 bookshelf speakers, and tried with Klipsch RP 820F-s both work great.
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Reviewed in the United States on May 15, 2025 by Coder