power cables' effect on power conditioner?

If your entire system is plugged into it its your most important cable.High gauge copper is best.

Ok, I get the importance of a heavy gauge cable from the outlet to the conditioner. I have an Audience Au24se cable that I can use for that. I have a LFD NCSE MKII+ integrated amp. I use  LFD Silicon Signature power cables for the amp and LFD Dac 5se dac. Although considerably less costly than the Audience the LFD cable gives a much better sound. But will the sound be changed noticeably by a different brand power cable in the chain? The LFD is not as heavy as the Audience.
Thanks for the info. Power conditioning is a new arena for me.

There is no risk in mixing brands among your power cables as long as the capacity of the cord matches the draw from the conditioner. So try and see what sounds best to you. My personal experience is that the cable to the conditioner is actually less sensitive than the cables from the conditioner, that’s assuming a conditioner that has some genuine power reserve/augmentation capability.

If your Audience PC is 10 gauge, it’s worth trying on the power conditioner. It has a low noise floor, but I wouldn’t call Audience a neutral sounding sounding cable.

Completely agree with @steakster.
Each PC in the chain has an effect on overall sonics.

Regarding power conditioners and amplifiers, make sure you choose a unit that is non-current limiting. IOW, a unit that does not affect the sonics or dynamics of a high current component.