Keep in mind the front center speaker on the pioneer equipped cruze, the signal is developed through a DSP in the pioneer amp to create the front center channel and rear subs, there are no pin outs for those channels out of the radios--any version, to do it right you need to create the front center signal, you need a mix of both left and right front channels, the sub woofer channels are just a active low pass filter built into most amps but the front center has to be done correctly or you will get sound cancelation, a DSP and amp is needed, also the DSP--in the radios, cut some of the bass to avoid speaker failure, so the bass is attenuated at the get go, and more so on the rear channels, I wish there was a pre-amp out on these radios so we could tailor the sound to our own taste but unfortunately there is not even a way to add pre-amp out since the signal is all digital at that point, I'm a lifetime electronics tech and opened up the radio to add pre-amp outputs and found it impossible !! unfortunately the radio is so highly integrated digitally with the rest of the cars systems, changing the headunit is a poor option due to the bandaid approach to integrating with the cruze digital systems-----so you best option is a aftermarket amp and DSP to drive those un-used speaker positions, this will allow you to turn up the bass that GM turned down
