i recently bought a package from spx audio that includes a 400 watt amp and two 10 inch subs. i hooked it all up and i get nothing but extremely random bumps (when i say random i mean it hits maybe 8 times a day) it is hooked in to a clarion drx6575z, which has been giving me trouble reciently (by not playing cds) should i replace the head unit or return the package all together?