Fosi Audio Box X4, Review and Thoughts Headphone Reviews and Discussion

The Fosi Audio Box X4 is a multi featured tube phono pre-amp marketed primarily for use with turntable audio setups. The Box X4 is compatible to use with both speakers and/or headphones.

Box X4 Phono Preamp & Headphone Amp Tube Bass Treble Control – Fosi Audio

Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control : Electronics

First pair of high end headphones! : r/headphones

FOSI Box X4 review Audio Science Review (ASR) Forum

The Opamp thread, Page 477

Fosi Audio Box X2 Phono Preamp Review - Audiophile Bargain? - Sound Matters

Customer reviews: Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control

Fosi Audio BOX X4 User Manual

Fosi Audio Box X3 5654W Tube Phono Preamp Turntable Preamplifier for MM Phonograph Bluetooth 5.0 Mini Stereo Hi-Fi Pre-Amplifier for Home Audio Record Player Sound System

I tried the top-rated DAC on – and it quickly went from good to bad to ugly

Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control : Electronics

Fosi Audio Box X4 - Not just for record players!

PSA: Fosi Audio V3 Pre-out does not scale with the volume knob. : r/BudgetAudiophile

Fosi Audio Box X3 5654W Tube Phono Preamp Turntable Preamplifier for MM Phonograph Bluetooth 5.0 Mini Stereo Hi-Fi Pre-Amplifier for Home Audio Record

Review: Fosi Audio DS1 – Brother of Shio

Fosi Audio P3 - Review

I tried the top-rated DAC on – and it quickly went from good to bad to ugly