Ideal impedance can Musical Fidelity V CAN II drive?

[whill_]

Hi guys!

 

I am just new here and i wanted to know what is the ideal rate of impedance that V CAN II can drive?

 

Currently i am using MAC > V Link 192 > V DAC II > V CAN II > Shure SRH 940

 

I am looking forward on upgrading headphones in the near future to either one of these EL 8, SRH 1840, Focal Professional and even LCD - XC as much as possible i want to use the current MFs that i have for it is fairly new (even it is already discontinued product) or should i just change my equipment and just save again for the headphones?

 

Thank you for kind answers.