My 15 inch l7 will not play high bass frequencies. In the song "the motto" by drake, the bass goes from low to high. As the bass builds up it gets more quiet until there is no bass coming from the woofer at all. Then it drops hard again and does the same process. Is there a way to fix this? It's passing me off because I paid a lot of money for this and it's skipping notes and it sounds like ****.