I am really trying to understand this audio stuff. I have a 2012 FLTRXSE with the stock HK head unit. I added a ARC 4 channel amp along with DLS component speakers with tweeters. I get a bit of distortion above 3/4 volume, and someone on here said to have Iron Cross Audio install pre amp outputs? I don`t know what they do, and in fact I don`t know jack about this audio stuff. The DLS speakers have a 150 RMS rating if that means anything? I was going to buy Focals at the time, but the specs were close for 1/2 the money. The head unit is currently having display issues, so I am going to send it in at some point. I was considering a different head unit, but do not want to loose my I-pod dock in the bag. But folks say aftermarket head units are way better. Are there any audio guru`s that can steer a dummy?