Imput impedance per leg?

Hi Guys

I'm thinking of using a pair of ATC SCM20ASL active monitors with an Audio Research LS25MKII line stage. Now I know that ARC suggests a minimum amplifier input impedance of 20Kohms. Checking the specs of the ATCs it states their input impedance is 10Kohms. Seeing this I figured well this wont work, but I noticed they use the term "10Kohm per leg". I'm guessing being a professional studio monitor they state their specs a little different. I tried googling for an answer but I'm not sure. Does this mean that there input impedance is 10Kohm + 10Kohm.. basically 20Kohm. Thanks!