Fosi Audio V1.0G 2 Channel Class D Mini Stereo Amplifier for Home Speakers TPA3116 50W x 2 with Power Supply
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AI Verdict
This is a dead-simple, surprisingly clean-sounding mini amplifier for powering a pair of passive bookshelf speakers on a desktop or in a small room.
This is a strong fit for its specific niche: providing clean, basic amplification for a single source at a very low cost. The use of the reliable TPA3116D2 chip in a no-frills package delivers on sound quality where it counts, making it perfect for budget desktop and small-room systems.
If you need more power and features like Bluetooth or tone controls, look for an amplifier based on the TPA3255 chip, such as Fosi's own BT20A Pro.
Regret Score™
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Critically weak dimension
Amazon rating vs actual quality
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Pros
- Delivers a clean, clear sound with no audible hiss or hum when idle, thanks to the TPA3116D2 chip.
- The solid aluminum chassis feels durable and looks good for a budget product.
- Extremely compact size makes it easy to place on a crowded desk or shelf.
- Includes a 19V 4.74A power supply, so it's ready to use out of the box.
Cons
- Speaker binding posts are small and close together, making it difficult to connect speaker wire thicker than 16-gauge.
- The single RCA input means you can only connect one device at a time, with no Bluetooth or digital options.
- Some users report channel imbalance, especially at very low volumes.
- The blue power indicator LED is exceptionally bright and can be distracting in a dark room.
Dimension Scores
It uses the well-regarded TI TPA3116D2 chip, which provides surprisingly clear and energetic sound for its price.
Provides enough power (50W x 2) for desktop and small room listening, but users note a 24V power supply is needed to get the best performance.
It's extremely limited, offering only a single stereo RCA input and nothing else.
The solid aluminum chassis and compact size make it feel durable and easy to place anywhere.
Best For
- Powering passive bookshelf speakers for a desktop computer audio setup.
- Creating a simple, compact stereo system for a bedroom, garage, or workshop.
- Reviving a pair of old, unpowered speakers you have in storage.
- A first step into component Hi-Fi for someone on a very tight budget.
Not Recommended For
- Driving large, power-hungry floor-standing speakers that require more current.
- Users who need multiple inputs for sources like a TV, computer, and phone simultaneously.
- Anyone who wants the convenience of wireless audio via Bluetooth.
Watch Out For
- The included 19V power supply doesn't allow the amp to reach its maximum advertised 50W output; you'll need to buy a separate 24V power supply for that.
- The speaker terminals are tiny and can be frustrating to use with bare wire or thicker cables; using banana plugs is highly recommended.
- Some units may suffer from poor quality control, leading to issues like channel imbalance right out of the box.
- The volume knob's taper is very aggressive, meaning most of the volume increase happens in the first quarter of the turn.
Full Specifications
| UPC | 653472995246 |
| ASIN | B071XQGYRJ |
| Brand | Fosi Audio |
| Voltage | 230 Volts |
| Language | English |
| Material | Aluminum |
| Item Weight | 1.8 pounds |
| Manufacturer | Fosi Audio |
| Output Power | 50 Watts |
| Mounting Type | Surface Mount |
| Item model number | V1.0G |
| Package Type Name | box" or "retail packaging |
| Specification Met | FCC |
| Number of Channels | 2 |
| Product Dimensions | 5 x 3 x 1 inches |
| Maximum Supply Voltage | 19 Volts |
| Minimum Supply Voltage | 12 Volts (DC) |
| Item dimensions L x W x H | 5 x 3 x 1 inches |
| Is Discontinued By Manufacturer | No |
What Buyers Say
The most surprising thing about the V1.0G is how good it sounds for something so small and cheap. It delivers genuinely clean power from the TPA3116D2 chip with a silent background, making it a massive upgrade over built-in TV or monitor speakers. The build is a solid little metal box that feels more expensive than it is. However, it's not without its quirks. The speaker terminals are frustratingly small, almost forcing you to use banana plugs, and the piercing blue power light needs to be covered with tape almost immediately. It's as basic as it gets—one input, one volume knob—but it does its one job very well.
“i literally can't believe this little metal box makes my old bookshelf speakers sound this good, for less than fifty bucks its the best money ive ever spent on audio.”
Common Praise
- Sound is clean and clear, with no distortion at reasonable volumes.
- Completely silent background with no hiss or hum.
- Solid aluminum case and knob feel sturdy and well-made.
- Incredibly small footprint fits on any desk.
- An amazing value for building a budget hi-fi setup.
Common Complaints
- The blue power LED is intensely and distractingly bright.
- Speaker binding posts are tiny and too close together.
- The included 19V power supply limits the maximum power output.
- Rarely, some units have channel imbalance at low volumes.
- The volume knob is very sensitive in the first part of its rotation.
Ownership Tips
- You will absolutely end up putting a piece of electrical tape over the blindingly bright blue power light.
- You'll quickly learn that all the usable volume is in the first 90 degrees of the knob's rotation.
- After a while, you might get curious and buy a 24V power brick just to see how much more volume and bass you can squeeze out of it.
- The amp is so lightweight that stiff, heavy RCA cables can pull it right off the desk.
Frequently Asked Questions
Does this amplifier come with a power supply?
Yes, it comes with a 19V power adapter and an AC cord, so you have everything you need to power it on.
Can I connect my turntable to this?
You can, but only if your turntable has a built-in phono preamp. This amplifier does not have a phono input, so it cannot amplify a turntable's signal directly.
Is there any noise or hiss when no music is playing?
No, users consistently report that the amplifier is dead silent with no audible noise when nothing is playing through it.
What kind of speakers can this power?
It's best suited for small to medium-sized bookshelf speakers with an impedance between 2 and 8 ohms. It will struggle with large, inefficient floor-standing speakers.
Does this have Bluetooth?
No, the V1.0G is a very basic amplifier with only a single stereo RCA input.
What's the best way to connect speaker wires?
Using banana plugs is highly recommended. The binding posts are small and can make connecting bare wire, especially thicker gauges, difficult.
Buying Guide
This is just an amplifier. Think of it as an engine for speakers. You need to provide your own passive (unpowered) speakers, a music source (like your computer's headphone jack or a separate DAC), and the cables to connect them. This box has one job: take a signal from the RCA inputs and make it powerful enough to drive your speakers. It's the definition of a simple, single-purpose component.
Class D Amplifier
It's like a modern, fuel-efficient engine. It's very small and doesn't waste energy creating a lot of heat, which is why this amp can be so tiny yet powerful without getting hot.
TPA3116D2 Chip
This is the 'brain' from Texas Instruments that does the actual amplifying. It's famous in the budget audio world for providing clean, low-distortion sound, which is why it's in so many of these popular mini amps.
50W x 2
This is its 'horsepower'. 50 watts for each of your two speakers is more than enough to get very loud in a small or medium-sized room with typical bookshelf speakers. Don't get too hung up on the number; it's plenty for a desktop.
Alternatives
If this is too basic, search for a 'Class D amplifier with Bluetooth' to connect wirelessly, or one with 'optical input' if you want to connect a TV directly.
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