XDUOO XD05 BAL2 Portable Balanced DAC Headphone Amplifier Bluetooth 5.1 4.4 Balanced USB XMOS XU316 AMP Decoder : Amazon.com.au: Electronics
iFi ZEN CAN Balanced Desktop Headphone Amp and Preamp with 4.4mm Outputs (UK PIN) : Amazon.com.au: Electronics
Archimago's Musings: REVIEW: iFi GO Bar - Portable DAC / Headphone Amp (Cirrus Logic DAC, Balanced & Unbalanced).
Shanling UP4 2022 Portable Balanced Bluetooth USB DAC Headphone Amplifier 2 x ES9219C DAC CSR8675 Chip 2.5mm Balanced 3.5mm Single Earphone Jack High Low Gain NFC HD Calling for Phone/TV/Tablet/PC/Car : Amazon.com.au:
Ray Samuels Audio SR-71B Fully-Balanced Portable Headphone Amp (Playback 60) - The Absolute Sound
The 3 Best Portable Headphone Amps With Built-In DAC of 2023 | Reviews by Wirecutter