Originally Posted by shravanc
Gain to be set to 50% you mean to 40hz?
Low pass set to LFE, I do not see that option, all I see is ability to set the Hz and db.
Thank you in advance for your comprehension and help.
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You want to set your gain control wherever you can get a good negative number when your AVR calibrates your system. So, whether the setting is at 40%, or 50%, or even higher, you would like to have your sub's trim level (the volume control for the sub in the AVR itself) set at about -8 after you run your automated EQ set-up. That will then enable you to raise the volume level of the sub in your AVR by about 6db, or so, in order to hear more dynamic bass. That part is a little complicated, but just take it on faith for the moment that you want to start with a good negative number and then add trim in the AVR up to about -1.
The reason I asked earlier where you were sitting was twofold. First, obviously, the further you are sitting from your subwoofer, the more of the room it has to fill. If you could move up to about 15', or so from the sub, it would help a lot. And I would try moving the sub back toward the corner, if I were you. That will give it some extra oomph. The second reason I asked where you were sitting is because I was hoping you would say that you were sitting toward one end of the room.
Sitting at virtually the exact midpoint of the room (at 25' in a 50' room), you are experiencing cancellation of some bass frequencies--essentially, you are sitting in a null zone. If you can move forward to about 1/3 or 2/5 of the room length, that alone should improve your bass. I think that you would ideally be at about 15' to 18' from the wall behind your screen. I am not sure what that would do to your optimum viewing distance, although I think that might improve as well, but I am sure that your bass response would improve.
Alan wasn't exaggerating when he said that you were putting an almost impossible demand on that 12" woofer, in a room that size, so anything you can do to help it, and improve your overall audio as well, should receive some serious consideration. Everyone here will be glad to help you get things dialed in.