INPUT/OUTPUT IMPEDANCE

Hello pro's,

I don't want to over think this, but I just pulled the trigger on a power amp rated at 10k(RCA) 15k(XLR) input impedance. Problem is I don't know the output impedance of my pre/pro(Marantz av7705). I looked everywhere and even called Marantz. My gut tells me all is ok...or is it!  I know you should be within the 1/10 ratio. So, does it make much difference whether your 1/10 or 1/100 ratio?

Thanks,
Anthony