Hey mate, I worked in the car stereo business for a little while. And can honestly say unless your amplifiers/ headunit and line driver if applicable is worth thousands and thousands of dollars I wouldn't bother with the expensive cabling. As long as the speaker wire has a decent strand count it will flow efficiently enough therefore a expensive product isn't particularly necasarry. The RCAs are a bit of a different story however. The more expensive te cable normally means it has better shielding properties therefore being less susceptible to interference and background noise. But the difference would be barely audible. If I were you I'd put that money to a better head unit with a better pre amp output a line driver or a amplifier with a better RMS output and a better total harmonic distortion rate. That would give you much more audible clarity over expensive speaker wire! Hope that info helped, Dave