This adapter cable converts your 2.5 mm TRRS plug terminated cable to a 4.4 mm Pentaconn plug.  Most commonly used for connecting balanced headphones terminated with a 2.5 mm TRRS plug to a 4.4 mm Pentaconn balanced output from an Headphone amplifier, DAP or DAC audio source.  There are many length choices available to double as an extension cable.  This cable transmits a balanced stereo signal.

The Pinout is as follows, also pictured above:

2.5 mm Tip, R- : 4.4 mm Ring 3

2.5 mm Ring 1, R+ : 4.4 mm Ring 2

2.5 mm Ring 2, L+ : 4.4 mm Tip

2.5 mm Sleeve, L- : 4.4 mm Ring 1

All cable options include excellent dielectric insulation and shielding to reject EMI and RFI.

OFC Cable Specs

• 24 AWG Oxygen Free Copper conductors (4x)
• High density braided copper shield.
• PE dielectric insulation.
• PVC Outer Jacket
• Outer Cable Diameter:  6.3 mm

SPOFC Cable Specs

• 20 AWG Silver Plated Oxygen Free Copper Conductors (4x)
• High density braided copper shield.
• PTFE Teflon dielectric insulation
• FEP Outer Jacket
• Outer Cable Diameter:  5.8 mm

OCC Cable Specs

• 24 AWG Ohno Continuous Cast conductors (4x)
• PE Dielectric Insulation
• High density braided copper shield.
• Aluminum Foil Shield
• Double Layer Outer PVC Jacket
• Outer Cable Diameter:  8.4 mm

Pure Silver Cable Specs

• 27 AWG Pure Silver conductors (4x)
• FEP Inner & PE Outer Layer Dielectric Insulation
• High density Silver Plated braided copper shield.
• Aluminum Foil Shield
• Double Layer Outer PVC Jacket
• Outer Cable Diameter:  8.4 mm

2.5 mm TRRS Connector Specs

• Gold Plated Pure Copper Contacts
• Carbon fiber and nonmagnetic stainless steel housing

4.4 mm Pentaconn TRRRS Connector Specs

• Gold Plated Pure Copper Contacts
• Carbon fiber and nonmagnetic stainless steel housing