Fosi Audio GR40 Tube DAC Headphone Amp/Preamp (Open Box) headphone cables A calibration kit with a

A calibration kit with a high-sensitivity microphone is also required and available from Bluesound with additional purchase

The result is a one-of-a-kind housing with a deep blue hue unique to indigo

ensuring consistent sound quality across different audio sources like smartphones

Earpiece Weight (oz)

inspiring your thoughts continually

Fosi Audio GR40 Tube DAC Headphone Amp/Preamp (Open Box) headphone cables A calibration kit with aProduct details Multifunctional DAC Preamplifier: The GR40 is a versatile tube DAC preamplifier and headphone amplifier in one, it supports Bluetooth USB Optical Coaxial inputs and active speakers 3. 5mm headphone output, with a priority mode for headphones. High Resolution Decoding: With the ESS9028Q2M DAC chip, the preamplifier offers superior audio quality and flexibility. The USB sampling rate supports 32Bit 384kHz and DSD256, making an effective