Fosi Audio GR40 Tube Preamplifier with DAC, Stereo Headphone Amplifier 3.5mm Home Audio for Active Speakers/Headphones, Digital to Analog Audio Converter Preamp with Bluetooth and USB/Opt/Coax

GR40 Vacuum Tube Preamp/Headphone Amp with DAC Review

Overview

The GR40 is a multifunctional vacuum tube DAC preamp and headphone amplifier designed to combine vintage warmth with modern clarity. Its versatile inputs include Bluetooth, USB, Optical, and Coaxial, making it compatible with a variety of audio sources.

Key Features

• Input: Bluetooth, USB, Optical, Coaxial
• Output: RCA, 3.5mm Headphone Output
• High-resolution DSD support
• Bluetooth Codecs: SBC, AAC, aptX, aptX HD, aptX LL
• THD < 0.03%, SNR ≥ 103 dB
• Power Supply: 12V 1.5A

Sound Quality

The GR40 leverages the ES9028Q2M DAC chip for superior audio performance, supporting 32Bit/384kHz and DSD256, which significantly reduces noise and distortion. The tube amplification provides a rich and warm sound, enhancing the listening experience.

Bluetooth Capability

Equipped with the QCC3031 Bluetooth chip, the GR40 ensures lossless audio streaming with low latency, ideal for movie watching.

User-Friendly Design

The compact form features intuitive controls for volume, bass, and treble adjustments, allowing for a personalized listening experience without complex setups.

Compatibility and Tubes

This preamp is compatible with various tube models, such as 5654W, 6AK5, and 6J1, providing flexibility for audio enthusiasts who like to experiment with different tubes.

Customer Feedback

With an average rating of 4.3 out of 5 stars from 25 reviews, customers commend the build quality, sound performance, and versatility of the GR40, equating its capabilities to more expensive devices.

Conclusion

If you’re looking for a high-quality vacuum tube preamp that merges classic sound with modern tech, the GR40 is a reliable choice for home audio and headphone experiences.