Is it possible that amp LPF crossover is not working

[bigmizzle99]

I have the RF R1200.1D and to me the LPF crossover is not working.

I've experimented with playing test tones, using 80Hz on a CD, and adjusting the LPF so that I could set the crossover, and the knob turns and nothing changes. I expected to be able to turn the knob and as soon as I got near 80Hz it would start to diminish...but it never changed. Its adjustable from 50 to 250Hz and turned all the way to 250 Hz, no filtering.

Same on music...play some bass music and play with knob...no changes.

Anyone ever experience this? Gonna contact Rockford support.

[SIDE SHOW]

Check to make sure the deck doesn't have lpf turned on aswell