iFi Audio GO link Portable Hi-Res HP-Amp/USB-C DAC - 3.5mm
4-Channel Portable Stereo Headphone Amplifier - Professional Multi Channel Mini Earphone Splitter Amp w/ 4 ¼” Balanced TRS Headphones Output Jack and 1/4" TRS Audio Input For Sound Mixer - Pyle PHA40 :
The 4 Best Portable Headphone Amps With Built-In DAC of 2024 | Reviews by Wirecutter
PROZOR Bluetooth Headphone Amplifier with Volume Control Gain Switch Portable 3.5mm Headphone Amplifier Rechargeble HiFi Earphone Amp for MP3 MP4 Mobile Phones Computers: Amazon.co.uk: Electronics & Photo