What is Fie?

Question

I have pioneer deh-34 and was wondering wat the option F I E is?? What does it do? It turns on to 100 then 160 then to 250.

Answer 1

Front Image Enhancer cuts the high frequencies out of your rear speakers.  Despite the name, it doesn't do anything to the front speakers.  The number is the cutoff frequency; if you set it for 100, the rear speakers will just play the deepest bass; set it for 250, and they'll play some lower midrange too.

The usual effect is to make people think their rear speakers aren't working.

Answer 2

Selectable FIE (Front Image Enhancer) (Rear LPF (Low Pass Filter) 100/160/250Hz)

Read the owners manual or register at Pioneer.com and download the PDF version.