Not on my amp its not

it is part of the intelli Q

Incorporated in the high-pass crossover, Intelli q maximizes performance of a sub-woofer,
the high-pass subsonic filter removes unwanted bass output from the woofer.

A High pass filter and subsonic filter are completely different on anything I have seen, if you have your high pass filter on on your amp you will get almost no bass, and the bass you do get will not be low
Just try taking it off, its not going to hurt anything to try

read the post above yours.

well somethings wrong just try it
or take it to where you got the amp and see what they say

K I will give it a try.

Cant really take it back to the place i bought it cause I bought the amp direct from orion.
Would have to send it away.

Man, my friend has that amp, dont use the HPF...

I think I would know, I did tune the thing after all.

they are two completelly diff things.

set your shiit up like this

LPF all the way up on amp and deck. NO SLOP, PUT IT TO FLAT
HPF all the way down on amp and deck. NO SLOP, PUT IT TO FLAT

subsonic all the way down

sub xover on deck - all the way up. sub boost all the way down. loud ON!!

btw at 0.8 ohm that amp does about 1700 rms.

At 0.8ohms that amp does close to 3000w rms

I have the 2500d not 1200d

It does 1700w rms @ 2ohms

oooooooooook and how do u know that it give that much power ?? did u clap and check your draw ?? anyways i think u just need to build a new box because the one u are using is probably the wrong size . Tell u what why dont u turn your box if u can and see how much u hit !!
hope it helps

Yes I had it bench tested about 2 months ago.

Tried turning the box around but it did worse.
But I did not seal it off around the box.

I am thinking the same thing that the box needs to be replaced.
I do Hear alittle port noise so I will need more port area.

Just not sure on box size.

I am thinking
2.5 cuft after sub and port displacement
65-70 square inches of port area
tuned to about 36-38hz

That is the only thing I can think of that it is the box.