On the speaker cable matter, I tested the Series 1 TPC and SPTPC. They're both great value at their price points, but I strongly preferred the SPTPC in my system.
I'll go off on a tangent for a moment. Listen to someone talking - a real person, not a recording - in your listening room. Note how the sound of their voice has a certain clarity and immediacy. I started paying attention to this when I started experimenting with power cables, which led to testing speaker cables and interconnects. My brother was living at my place due to WFH, and listening carefully to his voice (and others) I realized there is almost what I'll call an "edge" to the voice at the start of a word, as well as a lot of micro dynamics in the voice and room. It's not edgy, it's not bright, it's just their voice and lots of detail. I hadn't noticed this before I started paying careful attention.
I also hadn't heard that level of clarity in my system, but when I started the cable testing I found it.
Between the TPC and SPTPC, the latter has much more of the natural voice's energy and detail. It has better separation and depth. It was, in my opinion, well worth the higher price. At the time I was testing those, Iconoclast announced the Series 2 speaker cable. It was only available in TPC, and based on testing comments from others I decided to just go with that.
It was another level up again, though probably not as significant as the TPC vs SPTPC in the Series 1 cables. My system at the time was using my Aerius speakers, which I had bought new around 1995 if I recall correctly. Those were ML's "entry level" model and had numerous favorable reviews at the time. With those, the Series 2 had the greatest benefit in the midrange and above. The air, articulation and separation are tremendous.
Since then I've replaced the Aerius with 15As. I can't say how the different cable designs and materials might affect the system, but if I were testing today I would test both the Series 1 and Series 2 SPTPC speaker cables. I think the 2 is better at natural detail, separation and air, but the 1 might have a slightly better overall balance. I believe Galen uses the 1 for his lower frequencies and the 2 for the rest.
One last thought. I have a variety of power cables in my system, both from Shunyata and a gentleman named Duncan who is producing "Whisper" power cables. In the latter case, I have a single Elite with the Furutech NCF connectors, and I favor that one over the Shunyata Sigma NR v2 cables in my system.
What I found interesting in the power cable testing is they *increased* clarity, air and separation while *decreasing* fatigue and digital harshness in my office system. Those two effects seem contrary to me, and my main system didn't have any of that "fatigue" factor, but it still benefitted hugely from better power cables.
The Iconoclast speaker cables and interconnects magnified that effect for me, in my systems. (I'm using their speaker cables only in my main system.) I think they're well worth the effort to audition.