Bump at 50hz problem - AVS Forum
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post #1 of 9 Old 10-30-2012, 12:44 PM - Thread Starter
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I have a pretty nasty bump at 50hz, and was wondering best way to bring it down. I have 2 sealed 12" in the front and Onkyo 709. Ran Audyssey, and still there. The room is on the small size without any wall or corner treatments yet. What would be the best way to tame the bump between 50-65hz?
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post #2 of 9 Old 10-30-2012, 12:54 PM
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are the 12's in the same box or two different ones? First suggestion would be to try and place them (if two boxes) at the 1/4 distance in from each side wall.

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post #3 of 9 Old 10-30-2012, 01:03 PM - Thread Starter
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They are in their own boxes on each side of the TV.
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post #4 of 9 Old 10-30-2012, 02:24 PM
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Quote:
Originally Posted by SvtFoci View Post

They are in their own boxes on each side of the TV.
That may be the most pleasing arrangement for the eyes but possibly the worst for the ears. One method of placement is to first hook up one box and place it where it gives the best result. Then hook up the second and place it where it does the best job of smoothing out room modes.

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post #5 of 9 Old 10-30-2012, 02:31 PM - Thread Starter
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That was my next move. The only problem with that is that if i place the other one behind the seating area, it would be closer to it that the one upfront. I think I read somewhere that they should be placed around the same distance from the seating area.
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post #6 of 9 Old 10-30-2012, 02:54 PM
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Originally Posted by SvtFoci View Post

I think I read somewhere that they should be placed around the same distance from the seating area.
Not true. What matters is the result, and if it works best with one behind the seats that's what you do.

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post #7 of 9 Old 10-30-2012, 10:51 PM - Thread Starter
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I am at end of options. I have tried every position of placing not only 2 but even 3 subs. I have tried sealed and ported boxes, and nothing seems to be helping the the bump. Even audyssey does not fix it. In some in stances the difference is as high as 10db, and that's only going up a couple of HZ. Switching between Movie to Music on my 709 improves it a little bit, but nothing that is nearly acceptable. I am at a loss of what to do. Other that eq and bass traps, what else could I do before I do that? Could my room be that bad? It's hard wood floor and the subs sit on the floor, I keep thinking that could be a problem. Either way this has been very confusing and frustrating. In my other room, which was bigger, I had a pretty flat response to about 18-19 hz. My subs sound like some cheap store bought compared to how they sounded before. So any help would be greatly appreciated.
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post #8 of 9 Old 10-31-2012, 12:38 AM
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Did you do >4 listening points in the audyssey setup? I found that when I did few points it didn't EQ properly but adding 5+ seemed to make it a lot better.

Hardwood floors are more a problem for high frequency reflections. Carpet doesn't absorb a lot of bass.
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post #9 of 9 Old 10-31-2012, 11:00 AM
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Where is your seating positioned in the room, and do you have any flexibility to move it?

Another approach to try out positions is to put the subwoofer right at your primary listening location (temporarily), and then go around the room to determine where the bass sounds best (relative to the problem bump) - then put the sub there, and listen from the LP.
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