Alright to start off I have a alpine 9851. It's two years old but i've always had this problem but never dealt with it. If anyone owns one you know the sound level can go to like 30+ but I only turn mine up to 22. When i turn it beyond this point everything like cuts out, and i dont mean like turns off. I don;t know how to really word it but like after 22 my subs lose power and my highs drop down. I know its not my highs,amp, or subs it's somthing with the HU. I dont know if it shorts out when i turn it up higher or what so if anyone has some ideas