ARC LS-17 and Pass Labs 250.5 /350.5

I am looking to match an ARC LS-17 pre-amp to either
Pass Labs 250.5/350.5 amp. ARC specs states that the
amplifier's input impedance should be >20kohms.
The 250.5/350.5 amps input impedance equals 22kohms
balanced. Is this enough or is it a problem?
Thank you.
I have been very happy with Pass X250 and ARC LS15 for the past 2 years. I don't know the technical details but it sounds great. I run them balanced.