Hello,
I thought the same thing about power cords on subs. I have only listened to different pc on my JL Audio F110 subs. I had nice 14 GA Puritan Classic Plus cables but on each of the two subs. It did make an improvement over stock. It could be the gauge over the stock 16 ga wire. I bought some Straightwire Black Thunder pc for my DAC and Preamp. I put them on the Subs to break them in. I noticed an immediate difference in the bass. It was more powerful than before. Also, It was cleaner and faster or more detailed especially keeping up with my front speakers. These are 10 ga equivalent wire from six strands. I think the strands make a difference over solid core. All that mattered to me was it sounded better. Lets say 25% better than before. I did turn the gain down to match the room again. Even after turning them down it sounds like the low bass is enveloped in the room. I cannot tell it’s coming from the subs even at high levels. After that I played around with other things on the subs like putting them on IKEA cutting boards which made things even better for $20 a sub. I left the Straightwire Black Thunder on the subs too good to take off.