What are these doing when you turn them up?

[miker 5,000+ posts]

Alright... My HU has sublevel out volume, and AUX volume... When I turn these up do they just adjust volume? or do they change the voltage being sent to my amp? I just to know where to keep them... It's kinda like the bass knob question I guess.... How do yo use them? Or do you just keep them at 0?

thanks

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[nismos14 5,000+ posts]

AUX is only for when you're in aux mode.

Sub level adjust he sub output level.