I have Pioneer DEH-P5800MP Head Unit with:
Preout Voltage & Impedance of 2.2V, 1k Ohm
My friend has DEH-P5900IB Pioneer's newer model with :
Preout Voltage & Impedance Hi-Volt (4V), 100 ohm
So he says because he has higher voltage it will increase quality sound of his whole system inlcuding subs.
Is that true? Coz i always thought it's mostly about your amp and subwoofer.