separate

Hi All, First of all I would like to say Hello to everyone, especially Amir who does a great work and whole society for meaningful discussions. I was a passive observer of this forum for years now. Few words about myself. Audio engineering graduate, no longer working with acoustics. Music...

Hi, I'm going to get some powered bookshelf speakers with subwoofer but I'd like to control the volume separately for the speakers and sub. Is there some pre-amplifier with this option? or passive volume knob controller with two knobs each for speakers and sub separately? Thanks