This 4 Pin Mini Xlr Male to Female cable will extend the length of your headphones.  It is compatible with the Milian Acoustics Max-I.  It should also be compatibile with other headphones using 4 pin Mini XLR connections. It is recommended to keep single ended connections under 15 feet of total length. 
 
This extension cable is available in Oxygen Free Copper, and Silver Plated Oxygen Free Copper. 
 
OFC Cable Specs
24 AWG Oxygen Free Copper conductors (4x per channel)
High density braided copper shield.
PE dielectric insulation.
 
SPOFC Cable Specs
20 AWG Silver Plated Oxygen Free Copper Conductors (4x per channel)
High density braided copper shield.
PTFE Teflon dielectric insulation
FEP Outer Jacket