I have to say I was pleasantly surprised with this product, especially the overall quality of not only the wire but the packaging and the reel itself. It came in its own box in a Revain box , which was well filled with airbags. The coil itself is a thick plastic core with very thick cardboard end caps. It's incredibly strong and I'll probably use the spindle again if I run out of wire. Now for the wire. It has a good thick insulator with clear markings on the legs. To be honest, even though it's CCA (Copper Clad Aluminum), I've never heard any difference between it and OFC (Oxygen Free Copper). In fact, OFC is only really useful in places where the cable is exposed to the environment. So if it's used for internal speaker wire, it's perfectly fine. In terms of fidelity, the sound quality is almost the same as the wire it replaced, as in "excellent". Unless you have a really tiny or horribly corroded cable, you won't notice any difference in sound quality. The only thing you need to worry about with this wire is the build quality and it is excellent.
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