i'm running an ampeg svt-cl (1998) amp through an ampeg svt classic 8X10 cab. i'm using a 3band eq active pick up ernie ball music man stingray. i've read, and been told that when using a bass with active pick ups, that it is recommended to use the -15db input, rather than the 0db input. i've played around with it, and input to the 0bd jack. when i do this, i get much greater power and clarity (obviously). will i ruin the amp or the tubes, or anything for that matter if i use this input with the active bass, or is it manditory to use the -15db in my case? please help.