I can't find information on the pioneers preout voltage. Everything is simply stating high voltage preout. Most of the pioneers I have seen were 2.7 volts. I would check your gains at first. A well matched amp and head unit will have very low gain settings. My 8454 HU has 8 volts RMS prior to clipping. The amp will except up to eight volts. My HU clipps out on a scope at nearly 95 percent of max volume. That means that if I were running subs on my amp (which may want a very high volume) the gains should be just past the 8 volt setting or turned almost off. Since I run my front and rear speakers on this amp,and the volume is normaly at fourty to fifty percent, I can raise my gains to a quarter turn. Either way, the gains are very low. If I go much higher a audible hiss is induced into the sytem. If you can turn the gain down and eliminate the pop, then is a good place to start. If it doesn't help, then try swapping the sub out line with a rear channel rca to eliminate a defective channel.
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2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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