The Kenwood L-07 pre-amp had optional 10m cables to connect to the L-07m monoblock amps. They claimed that the super-low output z of the pre made the 5000 pF of cable capacitance ( 39 and change feet worth...) a non-issue. It was capable of driving a capacitive load, or so the claims went.

So the few hundred ohms will do just fine with a few feet of moderatly capacitive patch cords...
regards,
Douglas