Power Cable Suggestions.

I recommend Cardas power cord for your Naim SN3 and a DHLabs your subwoofer. The Cardas is very natural and music sounding an attribute that would be a good combination with your integrated. The DHLabs is my default standard for new equipment or non-critical applications (for instance, not $20K components).

@stormofkit-kat86 

Many choices.  Question is, which cables will synergize best with your audio system?  Which is the only thing that matters.  The only way to find out, you must conduct as many in-home auditions, with as many cables as you possible can. Happy listening.    

I use cables similar to these. No point in paying big money for name brand.

Cables on ebay

I agree with those saying you have to test the cabling on your system.  Preferably if you have someone that can do it for you while you sit and listen so you're not moving around a bunch between listens.  And those who say they can't hear differences in power cables have very low tier systems or rooms or have never tried it and are just internet arm chair pundits.  Ignore them like the plague

“And those who say they can't hear differences in power cables have very low tier systems or rooms or have never tried it and are just internet arm chair pundits.”

Here we go again. Déjà vu, except you forgot to add, “or can’t hear.”

OP, you will probably get lots of recommendations.  If you hear a difference, that is all that matters.  I use suitably sized, shielded power cables, made from good quality copper, and I don’t hear any reliably distinguishable differences between them in my system, and with my gear (which is all known for having well-designed and built power supplies). YMMV, for sure.