Review on Fosi Audio Box X4: High-Fidelity Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntables & Record Players – Volume, Bass, and Treble Control Included by Kevin Miller

Name: Fosi Audio Box X4: High-Fidelity Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntables & Record Players – Volume, Bass, and Treble Control Included
Item: Fosi Audio Box X4: High-Fidelity Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntables & Record Players – Volume, Bass, and Treble Control Included
Rating: 2

November 17, 2022

Terrible hum when turning on

At a quarter (nine o'clock) the volume was surprisingly loud and very, very bright; too bright. When the volume was turned up past a quarter, there was a very loud hum, almost like feedback. I've tried moving the preamp closer to the platter and then further away, but got the same result. I checked the ground and cable again and everything was connected correctly. I disabled it because I didn't want to damage my Klipsch Cornwall speakers.

Pros