Cheap/expensive or expensive/cheap?

I recently added Audioengine B1 Bluetooth receiver to my system.  It uses the latest Bluetooth codec and by far bested the previous  six buck BT dongle that it replaced.  I use BT primarily for podcasts that I start listening to on my drive home and finish after arriving, and occasionally with Qobuz if I want to sample something and don’t want to go the extra steps of using my Bryston streamer.
  At first I tried my Nordost  cables that cost more than the Audioengine , then the RCA cables that came with the Audioengine.
I couldn’t hear a difference.  Bluetooth is Bluetooth, even when done as well as possible on a revealing system.  The source is still the thing.

IME, cables matter, but only so much, and always relative to their system context an environment. If actual musical verisimilitude is the goal, then one needs speakers of a size capable of pressurizing the room to give bass instruments their proper weight. Cables won’t give you that. Proper placement is more important as well. But if these issues are well met, tweaking cables can be appreciated as being of some use.  That said, I can remember hearing a grossly undersized pair of Totem Tabu speakers (relative to the room size) set up with fabulously expensive Dutch monoblocks and garden hose cables, and the results were nothing short of magical. So what do I know, other than I could never afford such extravagance?
The source was standard CD of Bruce Cockburn performing “Kit Carson” from his great 1992 “Nothing But A Burning Light” album. 

I’ve tried 3 different Power cables with Pass Labs x150.8 and the xa25. To my ears the stock Labs PC delivers. Not by leaps and bounds. Though best with what I have available. The stock PC powers the amp. As for the other components of PC I use TWL, Nordost, and Anti-cables. 

three_easy_payments, still has the best answer to this question. Response number 1.

My suggestion is to find a quality audio dealer and work with them to build a system that suits your needs and budget.  Trying to do this using internet opinion forums and back issues of Stereophile is a fool's errand.The whole system needs to be considered, including the room, programming, and possible upgrade paths.  As you develop in this hobby, tastes will change as well as listening habits, and system parameters will change along the way.The wires used to connect the components need only be adequate for the task at hand.  More costly wire may alter the presentation, but the effects will be less obvious than spending the same amount of money on an improved front end or speakers.  Once you have established a system that suits your needs, experimenting with cables might bring incremental improvements or subtle changes to the sound signature.  It might be interesting, but could be expensive (that is for you to decide).Note:  A good, high end system can be assembled for less than $10k.  So much depends on your circumstances and expectations.  Spending more will get you more expensive equipment, but not necessarily better sound, or more importantly, more satisfaction. Synergy is the key concept here.  It all must work together.