Fosi Audio GR40 Tube DAC Headphone Amplifier / Preamp
The Fosi Audio GR40 combines the musical warmth of vacuum tubes with the precision of modern digital decoding. Acting as a tube DAC, headphone amplifier, and preamplifier in one, it delivers rich, transparent sound with remarkable versatility. Powered by the ESS ES9028Q2M DAC and equipped with Bluetooth 5.1 with aptX HD, The Fosi GR40 DAC/Amp brings true high-resolution playback to both wired and wireless systems. Compact, powerful, and beautifully finished, the Fosi Audio GR40 makes hi-fi sound approachable—balancing analogue warmth with digital finesse.
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Headphone DAC/Amp
Fosi Audio
Fosi Audio GR40 Stereo Tube DAC Headphone Amplifier With Bluetooth
Overview
The Fosi Audio GR40 is one of those rare all-in-one components that manage to be both highly functional and musically engaging. Designed as a hybrid tube DAC, headphone amplifier, and preamplifier, it can slide effortlessly into any system—from a hi-fi stack to a desktop or even as the control hub for a pair of active speakers. With USB-C, optical, coaxial, and Bluetooth 5.1 inputs, plus RCA and headphone outputs, the GR40 handles every source with ease. Plug in your headphones, and it automatically switches to headphone mode—making operation simple and intuitive.
At its heart, the GR40 Tube DAC/Amp from Fosi Audio uses the ESS ES9028Q2M DAC chip to achieve audiophile-grade conversion with support for 32-bit/384 kHz PCM and DSD256. The result is clean, detailed sound with deep dynamics and impressive resolution, whether streaming from a computer via USB or playing high-resolution files. Noise and distortion are kept impressively low, preserving every nuance and maintaining tonal accuracy across the frequency range.
Wireless performance is equally refined. Thanks to Qualcomm’s Bluetooth 5.1 module, the Fosi GR40 DAC/Amp supports aptX, aptX HD, aptX Low Latency, SBC, and AAC codecs for high-quality audio over a stable 10-metre connection. Movie watchers and gamers will appreciate the low-latency transmission, keeping sound perfectly in sync with the action onscreen.
Two JAN 5654W tubes shape the preamp stage, adding a touch of warmth and spaciousness to the otherwise precise presentation. The tonal balance feels smooth and engaging, with tuneable bass and treble controls for easy personalisation. It’s this blend of clarity and musicality that defines the Fosi GR40 headphone DAC/Amp —modern in execution, yet unmistakably analogue in feel.
Compact and elegantly finished in aluminium alloy, the Fosi Audio GR40 Tube DAC Headphone Amplifier & Preamp fits neatly into any listening space. With plug-and-play setup, intuitive operation, and the ability to drive headphones from 32 Ω to 300 Ω, it’s the perfect choice for music lovers who want real hi-fi sound without the complexity of separates.
Key Features
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The ESS ES9028Q2M DAC chipset delivers high-resolution 32-bit/384 kHz PCM and DSD256 decoding for true audiophile clarity.
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Twin JAN 5654W tubes provide a smooth, warm tonal character and natural midrange detail.
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Integrated Bluetooth ver.5.1 (QCC3031) supports aptX HD and Low Latency for high-quality wireless playback.
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Multiple digital inputs—USB-C, Optical, and Coaxial—plus RCA and 3.5 mm outputs ensure system flexibility.
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Acts as both headphone amplifier and preamp for active speakers or power amplifiers.
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Tone controls for bass and treble let you fine-tune your preferred sound signature.
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Automatic headphone detection switches output seamlessly when connected.
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Compact CNC-machined aluminium chassis combines durability with understated elegance.
Technical Stuff
| Product Type: | DAC / Headphone Amplifier / Pre-Amp |
| Technology: | Tube / Solid-State |
| Inputs: | 1x USB-C 1x Optical Toslink 1x Coaxial Bluetooth 5.1 |
| Outputs: |
Stereo RCA 3.5mm Headphone out |
| Headphone Power Output: | 300mW @ 16Ω 250mW @ 32Ω 50mW @ 250Ω 40mW @ 300Ω |
| Headphone Impedance: |
32 - 300 Ohm |
| Frequency Response: | 20 Hz – 20 kHz (± 1 dB) |
| THD: |
≤0.03% |
| SNR: | ≥ 103 dB |
| Dynamic Range: | ≥ 104 dB |
| Tubes: |
2 x 5654W |
| Sample Rates: |
Supports up to PCM 32-bit/384kHz and DSD256 |
| Bluetooth Chipset: | Qualcomm QCC3031 / Version 5.1 |
| Bluetooth Codecs: | aptX, aptX HD, aptX Low Latency, SBC, AAC |
| Bluetooth Range: | Up to 10 m (clear line of sight) |
| Power Supply: | 12v DC / 1.5 A |
| Dimension (WxHxD): | 110 × 40 x 160 mm (115 mm High with Antenna Up) |
| Weight: | 0.8 kg |
| Finish: | Black anodised aluminium |
A Visual Intro - Fosi Audio GR40 DAC Tube Headphone Amplifier ...
For More Information
Visit the manufacturer's website.
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Shipping
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