Fosi Audio GR40 Tube DAC Preamplifier

Description

Fosi Audio GR40 Tube DAC Preamplifier

The Fosi Audio GR40 Tube DAC Preamplifier combines cutting-edge technology with the warmth of vacuum tube sound.

This DAC tube preamp and headphone amplifier is designed to elevate your audio system, delivering hi-fi sound through its integrated ESS 9039Q2M DAC chip.

Supporting sample rates up to PCM 32-bit/768kHz and DSD512, it ensures pristine audio quality with low distortion.

FAQ’s

1. What is the Fosi Audio GR40 and what does it do?
   The GR40 is a tube-based DAC preamplifier that combines a digital-to-analog converter (DAC), vacuum tube preamplifier, and headphone amplifier in one unit. It’s designed to improve audio quality from digital sources while adding warmth and character typical of tube sound.
2. What input and output options does the GR40 support?
   The GR40 features multiple input formats including Bluetooth (aptX/aptX-HD/aptX-LL), USB, optical, and coaxial, making it versatile for use with phones, computers, TVs, and more. Outputs include a 5 mm headphone jack and RCA preamp outputs for active speakers or amplifiers.
3. What audio formats and resolutions can it handle?
   The GR40 uses a high-resolution ESS9028Q2M DAC chip and supports USB sampling rates up to 32-bit/384 kHz and DSD256, which means it can decode high-resolution PCM and DSD audio for detailed, low-noise playback.
4. Can the tubes be changed or upgraded?
   Yes, the GR40 uses removable vacuum tubes (usually 5725W/5654W type), and many users choose to swap them with compatible variants (e.g., EF95, 6AK5, 6J1, etc.) to customize the warmth and character of the sound.
5. Is it suitable for both headphones and speaker setups?
   Absolutely it functions as both a headphone amplifier and preamplifier. It has a headphone output with enough power for common impedance ranges and RCA outputs to feed active speakers or a power amplifier. However, very sensitive IEMs might reveal slight background noise typical of tube designs.

Features

• Integrated DAC Excellence: Powered by the ESS 9039Q2M DAC chip, it supports up to PCM 32-bit/768kHz and DSD512 for superior clarity and detail.
• Lossless Bluetooth Streaming: Features QCC3031 Bluetooth chip with aptX, aptX-HD, and aptX-LL support for premium, low-latency wireless audio.
• Compact Versatility: A compact design that pairs seamlessly with the V3 mini amplifier for space-saving functionality.
• Customizable Tube Warmth: Equipped with JAN 5654W vacuum tubes, allowing alternative tube compatibility for personalized sound profiles.

The GR40 features Bluetooth 5.1 connectivity with auto-reconnect functionality and advanced codec support, including aptX, aptX-HD, and aptX-LL.

Its compact design complements the V3 mini amplifier, creating a streamlined and aesthetically pleasing audio setup. The JAN 5654W vacuum tubes provide a classic warmth to your music and can be swapped out for other compatible tubes to suit individual preferences.

Perfect for audiophiles who appreciate high-fidelity sound, the GR40 offers versatile connectivity options—Bluetooth, USB, Optical, and Coaxial inputs, along with RCA outputs.

Its user-friendly tone adjustment knobs make fine-tuning audio a breeze, while its durable and compact construction ensures long-lasting performance in a variety of environments.

• Advanced Bluetooth with Low Latency: Featuring the QCC3031 Bluetooth module, it supports aptX, aptX-HD, and aptX-LL codecs to provide detailed and clean audio sound. Also, you can get a relaxed experience with low latency when watching movies.
• Compact yet Creativity: With its compact form and a combination of preamp volume, bass, and treble controls, the stereo preamplifier produces a sweeter, more organic sound while preserving the midrange and treble frequencies that make music.
• User-Friendly Design: The digital-to-analog audio converter GR40 is designed with user convenience at its core, allowing you to toggle between different audio inputs and restore Bluetooth—a real Plug-and-plug DAC preamplifier without any driver.

Specifications

• Wireless Connectivity: Bluetooth
• DAC Chipset: ESS 9039Q2M
• Inputs: Bluetooth, USB, Optical Toslink, and Coaxial
• Outputs: RCA and Headphone 3.5 mm
• THD(+N): ≤ 0.03%
• Dynamic Range: 104 dB
• SNR: 103 dB
• Processing resolution & sample rate: Supports up to PCM 32-bit/768kHz and DSD512
• Headphone amplifier output power: 250 mW at 32 Ω – 40 mW at 300 Ω
• Power consumption: 12 VDC
• Dimensions: 200 x 180 x 60 mm