2.5mm(Jack)-4.4mm(Socket) Balance-To-Balance
used for 2.5mm TRRS balanced output -professional or portable digital audio player such as FiiO, Astell&Kern products, and 4.4mm TRRRS balanced Cables
4.4mm(Jack)-2.5mm(Socket) Balance-To-Balance
used for 4.4mm TRRRS balanced output - professional or portable digital audio player such as Sony , and 4.4mm TRRRS balanced Cables
3.5mm(Jack)-4.4mm(Socket) Balance-To-Unbalance
used for 3.5mm TRS Unbalanced output - cellphones or most of portable digital audio players, and 4.4mm, and TRRRS balanced Cables
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