I got my 2 Shivas hooked up to a JBL 600.1 and They dont really start to slam untill the low pass is set to about 120. This is about where I have it set at now, is this about right? Should I go lower? I dont want to ruin my speakers. I did turn all my bass boost off and the level or gain is set at about 75 or 80% with all settings on my head unit flat. Thanks for your help!