To start I have the stock radio head NON-BOSE system in my silverado. I put Infinity Reference 6032's (6.5" 2 - 60 watt RMS - http://www.crutchfield.com/p_1086032CF/Infinity-Reference-6032cf.html?tp=95&nvpair=FFBrand|Infinity) front and rear to replace stockers. With the fader set to the rear, the rear speakers are VERY WEAK. The front ones are fine. What do I need to get some sound out of the rears? Thanks.