This extension cable is terminated with a 2.5 mm TRRS jack and a 2.5 mm TRRS Plug.  It will extend your balanced stereo signal as far as needed. Suitable for balanced headphones & IEMs.
 
All cable options include excellent dielectric insulation and shielding to reject EMI and RFI.
 
This Cable is available in OFC, SPOFC, OCC & Pure Silver. 
 
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