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Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
Product Strengths
- Good sound quality for the price
- Small and compact size, making it versatile for various setups
- Includes bass and treble tone controls for sound customization
- Bluetooth connectivity for wireless streaming
- Upgraded internals compared to the original BT20A, including a TPA3255 amp chip
Product Considerations
- Power output may not reach advertised levels without an upgraded power supply (48V recommended)
- Bluetooth is limited to SBC and AAC codecs
- No remote control included
- Speaker binding posts may be too small for larger gauge wires or spade connectors
- One reviewer pointed out potentially shady past Amazon review practices of the company
Comparisons (according to reviewers)
- The V3 has a slightly smoother presentation overall, while the BT20A Pro has a bit more 'oomph' or loudness
- The Pro has more power, preamp output, lower THD—better aesthetics
Takeaway: The Fosi Audio BT20A Pro is a compact and affordable amplifier that delivers surprisingly good sound and offers useful features like Bluetooth and tone controls. It's a great option for those looking for a budget-friendly way to power their speakers in a small space.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
All
BT20A PRO
reviews
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An excellent review of a great product
/
Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022
Video Review
Manufacturer details
Features
Specifications
- Output Power: 300Wx2 @4Ω
- Terminating Impedance: 2-8Ω
- Input Mode: Bluetooth + RCA
- Output Mode: Passive Speakers + Pre-out
- Frequency Range: 20Hz-20kHz(±1.2dB)
- THD: ≤0.005%
- SNR: ≥108dB
- Chip Set: TPA3255
- Bluetooth Transmission Distance: Up to 50Ft
- Bluetooth Transmission Format: SBC/AAC
- Device Dimension: 5x5x1 inches
- DC Input Range: 24-48V
- Power Supply: 32V 5A or 48V 5A
Description
The upgraded version of Fosi Audio BT20A, the BT20A Pro 600W TPA3255 Bluetooth 2.0 CH Amplifier features input via Bluetooth + RCA and output for passive speakers + pre-out.
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 MUSES02/OPA2604AP/SS3602 Amps to achieve a unique sound quality. With SNR≥108dB and THD≤0.005%.
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.
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 MUSES02/OPA2604AP/SS3602 Amps to achieve a unique sound quality. With SNR≥108dB and THD≤0.005%.
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.
Release Timeline
Manufacturer Site
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- Fosi incorporates adjustable treble and bass controls, allowing users to customize the sound signature to their preference and the characteristics of their speakers or headphones.
- The brand emphasizes value by utilizing quality components, such as name-brand capacitors and amplifier chips, at very competitive price points.
- Fosi Audio often includes versatile connectivity options, such as RCA, Bluetooth, and pre-outs, enabling compatibility with a wide range of audio sources and setups.
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Avg. Product Price
$500
Used For Sale
3
Available (Scroll Down)
Brand Popularity
48
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
23
Founding Year
2017
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
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Our interview with the brand
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What if you spend more?
Orchard Audio
Starkrimson Mono (Premium)
999
999
/
6
Reviews
Introducing the Starkrimson Mono Premium audio power amplifier – where innovation meets audio excellence. Groundbreaking gallium nitride (GaN) technology has been seamlessly integrated into every aspect of this audio masterpiece. GaN’s efficiency and precision redefine expectations, delivering crystal-clear, distortion-free sound reproduction across the entire frequency spectrum. Crafted with meticulous attention to detail, this amplifier boasts a sleek and modern design that complements any audio setup. The Starkrimson Mono Premium is not just an amplifier; it’s a statement piece that enhances your listening space with both aesthetics and performance. The Starkrimson Mono Premium amplifier provides an immersive journey into the heart of your favorite music. Elevate your audio experience with the pinnacle of GaN technology – the Starkrimson Mono Premium.
Orchard Audio is a direct-to-consumer hifi brand that uses Gallium Nitride (GaN) technology in their Starkrimson amplifiers, which allows for faster switching and less distortion compared to traditional amplifiers. Their compact Starkrimson Mono amplifiers deliver 150 watts per channel with very low noise, and the company provides detailed specifications and measurements that are valued by the audiophile community.
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Our summary
Product Strengths
- A very quiet background allows detailed music to emerge clearly
- Plenty of power (150W into 8 Ohms) exhibits good control, speed and dynamics
- GaN (Gallium Nitride) technology is used for efficient power throughput and performance, which shakes the bad reputation of Class D amps
- A neutral sound signature aims to reproduce the recording accurately
- Compact size allows for flexible placement and short speaker cables
- Balanced XLR cable connections are required, RCA connections need a separate adapter (sold by Orchard Audio)
Product Considerations
- Visually, the amps may not appeal to those seeking 'audiophile eye candy'
- A power cable is not included unless specified
- A power indicator light is absent
- In certain system pairings, the sound can be analytical or bright
Comparisons (according to reviewers)
- Starkrimson provides micron-precise separation, while the First Watt F5 thickens things up a touch
- Starkrimson offers more power and benefits from being a monoblock chassis, while the Gold Note IS-10 does not
- Starkrimson offers more power and better control over the bass, as well as speed, compared to the Nakamichi PA-5 Stasis
Takeaway: The Orchard Audio Starkrimson Mono Premium amps deliver power and performance in a small size, and are especially good for audiophiles that seek a neutral sound, lots of detail, and excellent value. These amps could be a great fit for anyone wanting a modern and efficient hifi experience.
Video review
Our take on the brand
Orchard Audio is a direct-to-consumer hifi brand that uses Gallium Nitride (GaN) technology in their Starkrimson amplifiers, which allows for faster switching and less distortion compared to traditional amplifiers. Their compact Starkrimson Mono amplifiers deliver 150 watts per channel with very low noise, and the company provides detailed specifications and measurements that are valued by the audiophile community.
Product Page
Product Page
Topping
LA90
799
799
/
10
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Expand Details
Our summary
Product Strengths
- Delivers a clean and detailed sound, allowing listeners to hear nuances in recordings
- Offers good instrument separation and imaging
- Has a low noise floor, creating a 'black background' and enhancing the listening experience
- Compact size for an A-B amplifier
- Does not have RCA inputs, requiring XLR or TRS balanced connections
Product Considerations
- May not have enough power for inefficient speakers or large rooms
- External power supply 'brick' is large
- No remote control
Comparisons (according to reviewers)
- The LA90 has a more neutral sound than Cambridge Audio AXA25, which is cleaner and more detailed
- The LA90 comes close to Benchmark AHB2's performance, but does not outperform it in bass impact and soundstage size, and the AHB2 also has more protection systems
- The LA90 offers more vocal clarity and fuller bottom end than Schiit Vidar, but the Vidar is more exciting on top
- Emotiva A1's have more power
Takeaway: The Topping LA-90 Discrete is a small amplifier that produces very clear sound with good detail, making it great for those who already have balanced audio equipment. It could be a nice upgrade for those seeking to hear all the subtleties in their music.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Product Page
Product Page
Topping
LA90 (Discrete)
799
799
/
9
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Expand Details
Product Strengths
- Impressive specs and measurements showcase extremely low noise and distortion
- Clean and transparent sound aims for a neutral reproduction of music
- Compact size and sleek design make it suitable for small spaces
- CNC machined aluminum chassis allows for maximum thermal flow to keep the unit running cool
Product Considerations
- Included external power supply is large and heavy, which can be a challenge to hide
- Power output may be limiting, especially with demanding speakers and for high dynamic range tracks
- Bass performance, while tight and controlled, may lack sub-bass extension and impact for some listeners
- Lack of a remote control limits its convenience as an integrated amplifier
Comparisons (according to reviewers)
- The Discrete version matches the Topping LA90 IC based unit's exemplary performance, but betters it in power handling
- The Topping LA90 comes close to the Benchmark AHB2 in noise floor and detail retrieval, but the AHB2 has more power, impactful bass, and a bigger soundstage
Takeaway: The Topping LA90 is a compact and technically proficient amplifier that delivers a clean and transparent sound and with impressive specs. It is best suited for those with efficient speakers and a preference for accurate sound reproduction without coloration.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Product Page
Product Page
Expand Details
Our summary
Product Strengths
- Bass performance is taut, detailed, and well-dampened
- Delivers a neutral presentation overall
- Has a solid steel chassis and milled aluminum faceplate
- The A1 is able to drive low impedance speakers with power and grandeur
- Produces 200 watts into 8 ohms and 325-350 watts into 4 ohms
- Only has a single line-level RCA-style input
Product Considerations
- Audible tweeter hiss may be present at idle, especially with highly efficient speakers
- High frequencies are not as smooth at the edges, exhibiting just faint traces of grain when listening at above-average levels
Comparisons (according to reviewers)
- Vs Rotel 1592 MkII amp: A1 is notably quieter and more detailed
- Vs Crown XLS Drive Core 2 amps: A1 is equally neutral in tone, has a lower noise floor, and a more consumer-friendly design
- Vs Schiit Vidar: A1 has a larger soundstage
Takeaway: The BasX A1 monoblock amplifier delivers good power and a neutral sound signature. It is a great option for those looking to expand an existing AVR or build a cost-effective hi-fi system.
Video review
Our take on the brand
Emotiva is a direct-to-consumer hifi brand that enables audiophiles to customize their amplifier configurations through a modular "Build Your Own" approach, using their Differential Reference design to minimize noise and distortion.
Product Page
Product Page
What competes at this price?
Fosi
ZA3
129
/
Released
2023
The next generation balanced dual-mode Class-D power amplifier. Fosi Audio's first amplifier supporting both stereo and mono modes.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Great value for the money and an attractive price point
- Balanced input and single-ended RCA input
- Op amps are swappable
- Compact form factor
- Versatile with stereo and mono mode
Product Considerations
- The volume control was found to be touchy by some reviewers
- The included power brick is quite large, almost as big as the unit itself
- The binding posts are small
- The RCA input sounds inferior to the XLR input
- The amplifier does not high pass the mains when a subwoofer is plugged in
Comparisons (according to reviewers)
- Vs Fosi Audio V3: ZA3 is considered a more mature version with stylistic elements and new features like balanced inputs and mono mode, with a naturalness in the tonal quality
- Vs SMSL AO200 MKII: AO200 MKII delivers better clarity, definition, and resolution of the sound
Takeaway: The ZA3 is a versatile and compact amplifier that offers great value, especially for those starting their audio journey. Its ability to be used in both stereo and mono configurations and the option to upgrade components make it a flexible choice for various setups.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
Product Page
Fosi
Audio V3
109
/
Released
2023
The Next-Gen Monoblock Fosi Audio V3 Mono Mini Power Amplifier is a debut Class D audio amplifier with PFFB technology to significantly improve sound purity and system efficiency, offering a flexible solution to your home audio system.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Small and sturdy, made of CNC-milled aluminium
- Delivers a premium feel with impeccable junctions and premium materials
- Minimalistic I/O with interesting features
- Impressive build quality, especially considering the price and rated power
Product Considerations
- Relies on a separate power-supply that appears to be bigger than the amp itself, which may cause cable management issues
- Gain switch only works when plugged in RCA, via the XLR input the Fosi always works at 20dB, though
Comparisons (according to reviewers)
- Compared to the WiiM Amp, it became a benchmark for many users in the sub-$500 configuration
- Compared to the NuPrime STA-100, both amps push equal numbers
Takeaway: The Fosi Audio V3 Mono Power Amp is a compact and powerful amplifier that offers great value. Its small size and impressive build quality make it a great choice for those looking for a stealthy and capable amp.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
Product Page
Fosi
BT30D PRO
109
/
Released
2023
Advanced 2.1CH Bluetooth 5.0 Receiver Amplifier achieves HiFi music quality, the best choice for your home audio entertainment. You can connect passive speakers/passive subwoofer/powered speakers/powered subwoofer to DIY a stereo sound system. Fosi Audio BT30D Pro is the upgraded version for BT30D.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Massive power output for its size, with 2x165W + 350W for a 2.1 system configuration
- Very effective treble and bass EQ adjustments with analog knobs that do not introduce noise or distortions, even when cranked up
- Surprisingly rugged build quality, with a full aluminum build, including metal knobs
- Can drive either passive or active speakers and is equipped with a subwoofer output in addition to a full-range 3.5mm pre-out
- Bluetooth sounds almost as good as a wired RCA connection
Product Considerations
- Does not have an IR remote
- The power converter may have a physical buzzing noise, audible when close to it
- Midrange has some coloration and slight distortion at louder volumes
- The speaker terminals are a little cramped
- There is no central stop point for 0db bass/treble boost
Comparisons (according to reviewers)
- Vs Dayton Audio DT100A—BT30D Pro feels more powerful, gets louder, and has a higher build quality
Takeaway: The Fosi Audio BT30D Pro is a powerful and versatile amplifier with great EQ control, making it a superb choice for a 2.1 audio system. It delivers clean and detailed sound with surprising power for its compact size.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
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Fosi
HD-A1
219
/
Released
RMS 50watts x 2(8 ohms, 20 Hz - 20 kHz, 0.02% THD) for 2-16ohm speakers. Similar to the HDAM circuit, adopts TOSHIBA 2SA1943 *2 and 2SC5200 as amplifier output chip to get HI-FI sound quality; Home HiFi amplifier, Sturdy, Aluminum enclosed amp makes it perfect for projects and DIY audio applications.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Very well-built and feels solid and heavy for its size
- Uses high-quality components such as Japanese Alps potentiometer, Omron relay, Nover Gold Audio capacitors, and Toshiba transistors
- Has a toroidal transformer that is considered overkill for its power output, which is a positive thing
- Has a warm sound signature, sometimes described as tube-like
Product Considerations
- Lacks a volume indicator on the knob
- Only has one set of RCA inputs, which may limit connectivity for some users
- Some reviewers found the 50 watts per channel to be lacking punch with certain speakers
- Has no remote, digital inputs, streaming capabilities, or phono stage
- The gold color of the chassis may not appeal to everyone
Comparisons (according to reviewers)
- Fosi Audio HD-A1 is slightly cleaner with a lower noise floor than the Emotiva A300, but lacks the punch
- Paired with infinity intermezzo 4.1 T speakers, the Fosi Audio HD-A1 sounds better than the Marantz nr1200 powering Sony SSCS5 speakers
- The Fosi Audio HD-A1 has a similar clean, powerful class A/B signature as the Emotiva A300, but with a touch of warmth
Takeaway: The Fosi Audio HD-A1 is a compact and powerful amplifier with high-quality components and a warm sound. It could be a great entry point into hifi audio.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
Product Page
Fosi
DA2120D
159
/
Released
2023
Fosi Audio DA-2120D Amplifier is a Bluetooth 5.0 audio amplifier for passive speakers that features a stereo 100 watt x2 power output. Can provide you with high-fidelity streaming music. DA-2120D is a 2.1 channel power DAC amplifier that is equipped with Bluetooth, PC-USB, coaxial, optical, and 3.5mm aux input.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Easy sound that's far better than one might expect for a product this inexpensive
- Dynamics are especially good, and there's plenty of dynamic swing
- Top end was exceptionally smooth and musical
- Fosi is small, but it seems solidly put together
Product Considerations
- When being driven by any of the digital inputs, the DA2120D would emit a burst of varying durations that sounded almost like white noise
- The burst varied with volume, potentially damaging speakers
- The issue appears to be a fault in the Fosi's internal DAC, and only happened while driving the Fosi from one of its digital inputs
Takeaway: The DA2120D offers good sound quality and dynamics for its price, making it a potentially worthwhile option if using AUX or Bluetooth input. It is a well-executed design in many ways.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
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