Diplexers
10+ year member
Logarithmic Robot
However, it does effect amplitude of the frequencies.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif based on total power output of the amp at each impedance, and motor/cone design.the impedance you run the amp at has no effect on the frequency response of the sub.