In the photo on the left is 12 gauge speaker wire from another source and Pyle's wire on the right. You can clearly see that Pyle is 14 gauge, not 12. It's also made of CCA (Copper Clad Aluminum), which can handle 25% less current than solid copper. Another commenter measured the cable impedance and found it to be over 1/2 ohm, which might not sound like much, but with a class D amp driving 2 ohm speakers that's a significant loss.
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