volume control

Hello! I have HK Logic7 sound system in my MB W211 T, and added Z623 Sub into trunk for more bass. Aux cable connected to factory sub cable: It plays very good, even the rear view mirror vibrates now :D Bypassed this: With this: I have two questions: 1) How i could make the sub play only...

Hi all, I just installed an ilx-507 in the settings I can't turn down the subwoofer volume I called Alpine and the rep said to fade to the front to control the subs output is that the only thing you can do?