That should be OK. FWIW you would do a lot better running balanced as opposed to single ended for lengths like this- you will get far less coloration from the cable.
5 responses Add your response
With the output impedance of your ARC SP-16 at 260ohm and your capacitance of the cable at 661pf will make a HF filter at -3db at 926khz, no problem at all.
And the spec for 1000pf max load capacitance of your ARC is the max it can take for it may start to ring on "square wave test" as with 1000pf the -3db is at 612khz, still not effecting the audio band at all.
So it will just come down to if there is any noise with this length of single ended interconnect, or the colourations it may give.