Fosi Audio GR40
- 2 reviews
- Fosi Audio
Fosi Audio GR40
- 2 reviews
- Fosi Audio
$119.90
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
How to connect
What you should know
EMiUZEK buying notes
Frequently asked questions
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Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio GR40 is a desktop tube DAC, headphone amplifier and preamplifier for digital and Bluetooth sources.
USB, optical, coaxial and Bluetooth inputs, replaceable 5654W tubes, tone controls and RCA pre-output make it a flexible centerpiece for headphones or powered audio systems.
Why it stands out
Multi-input desktop DAC
Accepts USB, optical, coaxial and Bluetooth sources in one compact component.
Tube analog stage
Two replaceable 5654W tubes add tube-based amplification and visual character.
Headphone and preamp operation
Use the front 3.5mm headphone output or feed powered speakers and power amplifiers from RCA.
High-resolution and codec support
Supports PCM 32-bit/384kHz, DSD256 and Bluetooth codecs including aptX HD and aptX LL.
Best for
- Desktop headphone listening
- TVs with optical audio output
- Computers using USB audio
- Powered speakers or separate power amplifiers
Not ideal for
- Directly driving passive speakers
- Balanced headphone or XLR systems
- Turntables without a phono preamplifier
EMiUZEK Buying Notes
- GR40 is not a speaker power amplifier; passive speakers require a separate power amplifier.
- The RCA output is muted when headphones are connected.
- Allow the tubes to cool before removal and only use officially compatible replacements.
Frequently asked questions
Can GR40 power passive speakers?
No. Connect its RCA output to a separate power amplifier or use powered speakers.
Can it connect to a TV?
Yes, through a compatible optical or coaxial digital output.
Does it include a phono input?
No. A turntable requires a built-in or external phono preamplifier.
Which headphones are supported?
The official range is 32–300Ω through the 3.5mm output.
Can the tubes be replaced?
Yes, but only with compatible tube types and after the unit is powered off and cool.
What Bluetooth codecs are supported?
SBC, AAC, aptX, aptX HD and aptX LL are listed in the manual.
HOW TO CONNECT
Computer headphone system
Source icon: computer
Source: Windows PC / Mac
Connection: USB audio
Output connection: 3.5mm headphone output
Target icon: headphones
Output: Wired headphones
TV headphone system
Source icon: tv
Source: TV
Connection: Optical or coaxial PCM
Output connection: 3.5mm headphone output
Target icon: headphones
Output: Wired headphones
Powered speaker or amplifier system
Source icon: streamer
Source: Digital source / Bluetooth device
Connection: USB, optical, coaxial or Bluetooth
Output connection: RCA pre-output
Target icon: speakers
Output: Powered speakers or separate power amplifier
Technical Specifications
Inputs and outputs
| Feature | Specification |
|---|---|
| Inputs | USB; optical; coaxial; Bluetooth |
| Outputs | RCA pre-output; 3.5mm headphone output |
| Channels | 2.0 |
| Tube complement | 2 × 5654W |
Digital and headphone performance
| Feature | Specification |
|---|---|
| Maximum resolution | PCM 32-bit / 384kHz; DSD256 |
| Bluetooth | 5.1; SBC, AAC, aptX, aptX HD, aptX LL |
| Headphone impedance | 32–300Ω |
| Output power | 300mW @ 16Ω; 250mW @ 32Ω; 50mW @ 250Ω; 40mW @ 300Ω |
| SNR | ≥103dB |
| Power input | DC 12V |
Additional Product Content
Comparison: Which Fosi Audio model is right for you?
| Model | GR40 | GR70 | K7 |
|---|---|---|---|
| Product position | Tube DAC / headphone amp / preamp | Analog tube headphone amp / preamp | Balanced digital DAC / headphone amp |
| Digital inputs | USB, optical, coaxial, Bluetooth | None | USB, optical, coaxial, Bluetooth |
| Headphone outputs | 3.5mm | 3.5mm and 6.35mm | 3.5mm and 4.4mm balanced |
| Speaker-system output | RCA pre-out | RCA pre-out | RCA line output |
| Best use | Digital sources with tube stage | Analog tube headphone system | High-output HiFi and gaming |
What's in the box, manuals and downloads
Shipping, warranty and returns
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We provide tracked international shipping with delivery options and estimated delivery times shown during checkout.
Official Warranty Support
All products sold by EMIUZEK are genuine products with manufacturer warranty support.
Our HiFi specialists provide assistance with compatibility, setup, and technical questions.
Easy Returns
Eligible returns are available according to our return policy.
Please contact EMIUZEK before returning any product so we can provide assistance.
