Ocinn 11-25-2016I took a look at the descriptions of the Harrison Labs crossovers. Although detailed information such as a schematic doesn’t seem to be available, it is clear that the PFMod is a passive device, and one that is particularly load sensitive. For example, for the FMod the high pass corner frequency is indicated as varying from +25% relative to its nominal value for a 10K load to -15% for a 47K load. While in itself that might not have a great deal of significance it would seem to indicate that sensitivity to cable differences, such as capacitance, is likely to be both greater in degree and different in character than for most other applications. Probably including the applications and experiences upon which the suggestions made by the others have been based.
Harrison Labs PFMod crossover (soon to be replaced by MiniDSP)
So my suggestion is to do nothing until you replace the PFMod with the MiniDSP, which of course is an active device, and depending on model may have an output impedance of 560 ohms. Then see if your friend’s cables make a difference relative to the ones you are using.
Good luck. Regards,
-- Al