Powerflex Drives Specifications

When reading the Specifications for a Powerflex 750 Series Drive it states that in Flux Vector Torque Control Mode the specification is 

+/- 2% 2500 rads/s bandwidth with an encoder 

and

+/- 5% 600 rads/s bandwidth without an encoder

I understand the percent is percent of total base torque.

So if using a 60 n-m motor the 2% is 1.2 n-m or 5% is 3.0 n-m.

I just don't understand what radians per second bandwidth has to modify the situation.