Buy 2.5mm Female to 6.3mm Male Adaptor - Headgear Audio – Headgear_Audio
iFi 2.5mm or 3.5mm to 4.4mm Headphone Adapter | Bloom Audio
Headphone Adapter 2.5mm to 4.4mm by iFi audio - Convert your 2.5mm headphones to fit 4.4mm Balanced outputs.
Buy Wholesale China Compatible Mhe100.5 Balanced 1/4" Trs Female To Right-angle Stereo 3.5mm Male Headphone Adapter & Trs To Ts Adapter at USD 3 | Global Sources
Amazon.com: GUCraftsman 2.5mm Balanced Male to 4.4mm Balanced Female Portable Headphone Adapter Cable 6N Single Crystal Silver Headphone Jack Convert Cable for Audio Players with 2.5mm Balanced Ports : Electronics
Amazon.com: 4.4mm Balanced Male to 4 Pin XLR Balanced Female Portable Headphone Adapter Cable 6N Single Crystal Silver Headphone Jack Convert Cable for Audio Players with 4.4mm Ports : Electronics
GAGACOCC 4.4MM Male to 4.4MM Female Balanced Crystal Clear Silver Plat
Balanced 4.4mm Pentaconn 4-pin XLR Adaptor - Etsy
GUCraftsman Headphone Adapter Cable 6N Single Crystal Silver Headphone Jack Convert Cable for Audio Players — HiFiGo
Mytek Balanced Headphone Adapter Cable for Brooklyn DAC and Manhattan DAC