I needed a passive device that would control various settings for my car subwoofer including a dedicated volume control for the sub only, I could not be happier with this purchase. This unit turns on with the head unit and also allows a separate IPod or accessory input to the EQ, faceplate illumination can be changed from green to red, (I needed Red), also has line level input adjustments so any input you supply to EQ can be modulated to be the same volume as head unit. In other words if you have a CD Changer unit separate from your head unit when switching from a CD played in the head unit and another being played from the CD changer in the trunk there will be no marked volume difference between the units. Nothing worse than having a nice song playing at a medium volume level to then be followed by one that scares the bejezzuz out of you because it is five or six volume settings louder because of a line level input difference. This unit makes all of your different speakers and input devices work nice together, well worth the money
