Cable capacitance will be no problem, considering the lengths that are involved. And also the fact that both Kimbers have relatively low capacitance, in the rough vicinity of 20 pf/ft. I couldn't find capacitance specs on the AQ interconnect, but I would feel certain that it won't be high enough to cause a problem, given the lengths that are involved, and also the fact that both source components have low output impedances at high frequencies.
I couldn't find an input impedance spec on the AMP-100, but the input impedance of the ProLogue is a comfortably high 65K. The Rotel CDP and the Wavelength USB DAC both have specified nominal output impedances of 100 ohms. However, according to JA's measurements
of the Wavelength DAC in Stereophile:
The line-level jacks featured a low output impedance of 33 ohms at high and middle frequencies, but this rose to 1504 ohms at 20Hz, presumably due to the presence of an output coupling capacitor. The Proton should be used with a preamp having an input impedance of at least 10k ohms if the bass is not to sound a little lean.
As long as the input impedance of the AMP-100 is not less than around 12K, the parallel combination of its input impedance and the input impedance of the Prologue will be greater than 10K. The combined input impedance is equal to the product (multiplication) of the two individual input impedances divided by their sum. (12x65)/(12+65) = 10.1. And it would be unusual (although not unheard of) for the input impedance of an amplifier to be less than 12K.
So I think that most likely you'll be fine in all respects, and I'd imagine that the AQ splitter would be a good choice as well. To fully confirm that the input impedance of the AMP-100 does not cause an issue in conjunction with the low frequency output impedance rise of the Wavelength, though, compare the deep bass that you hear through your main speakers when listening to the Wavelength with and without the AMP-100 being connected.