Depisuta Headphone Amplifier - 4 Channel USB Power 1/4in TRS

Zoom ZHA-4 - 4-channel Headphone Amplifier

Behringer HA400 - 4 Channel Stereo Headphone Amplifier

Samson QH4 - 4 Channel Headphone Amplifier

Mackie HM-4 - 1-ch x 4 Headphone Amplifier

TNP Products Headphone Amplifier - RCA Input 3.5mm 6.3mm Output

SYOSI 4 Channel Headphone Amplifier

Morelian AMP-14 - 4-Channel Headphone Amplifier

Surfans X10 - Portable Headphone Amplifier DAC USB-C Hi-Res

DIYEAH Mini Headphone Amplifier Converter - Portable Single Channel

NOENNULL Portable Headphone Amplifier - 4 Channel USB Power Supply