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All I know is, I definitely noticed an upgrade to the audio quality coming out of my satellites! The mids and highs are indeed clearer and crisper, and the sound stage was improved as well. The description of the mystery brand wires claims that using a Silver solder maximizes conductivity resulting in an even better and clearer sound signal.
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In addition, the description also says that the exposed ends that plug into the amplifier are soldered in with a Silver solder I can't tell if the Monster wires are soldered at all (there's only one photo of the Monster wires, and it's not very good). I went with the mystery brand because unlike the description of the Monster wires, these said that they're made from Oxygen-free wires. You can either get the Monster-branded wires or you can get some mystery-brand if you don't want to contribute to Monster's already-excessive income. You can get them brand new through eBay (which is actually what I did) for less than $25 after shipping. Speaking of the wires, you can further increase the audio quality by upgrading to 16 AWG wires (the stock wires are much thinner at 22 AWG). Another nice thing about having the ends bieng soldered is, you don't have to worry about frayed wires that you have to twist back together. The older system might also have superior fuses as well. I think a part of the reason for the superior sound is the fact that the speaker wires are plug-in style vs.