The reason your volts are off because you have to set the little phillips screw on side it will work the rite way and accurately
Putting in system tomorrow we will see whats it about.
I love the universal bass knobs, the only thing I didn't like was it cuts off when you cut the car off. But I'll run another remote wire just for the subs and it'll be perfect..
I haven’t installed this bass knob yet so I can’t review on its functionality. But just from holding and turning the knob everything about this bass knob feels cheap and of low quality. The potentiometer is not smooth and has a loose feel it’s all plastic and fairly large. But like I said I haven’t hooked it up yet so I will be back to update this review