I graphed my new Epik Dynasty sub from 14HZ to 100 HZ.

I used a RS meter on a tripod at my main seating position. I used test tones in 1 HZ increments from 10HZ on up. I ran it with no EQ and plotted. I ran it with Audessey EQ on and plotted. I ran it with my Onkyo 605 EQ on and plotted.

I ran a pink noise test and dialed it in to 65dB before I ran the test tones.

The Onkyo will only EQ at 25HZ, 40HZ, and 63HZ for the subwoofer. I have a pronounced null at 56HZ that rises immediately on at 55HZ and 57HZ.

Audessey seems to do little. It raised the null a couple of DB's, but overall it follows the "NO EQ" line pretty closely.

I was also surprised at how little the Onkyo receiver EQ did. I bumped 25HZ +3dB, 40HZ I used -2db, and 63db +3db. Looking at the graph...nothing happend.

Looking at the below chart, how bad is my response line???

http://i66.photobucket.com/albums/h260/juliussrt8/DBtest.jpg

Any suggestions?
Would a separate EQ help me here?
If so, what are my best options?
Would the difference be that noticeable?

Thanks for any input.

MrJulius

Well, this looks like the best I can do with the Onkyo EQ...

http://i66.photobucket.com/albums/h260/juliussrt8/DBfinal.jpg

I was able to knock out some of that 56HZ dip. Couldn't do much else with the rest of the graph.

you should never try to EQ up nulls. it is always a bad idea. where is the sub placed and have you tried the sub anywhere else? location can make a big difference in frequency response.

Actually it doesn't look all that terrible. I would think Audyssey would have helped level it out more but as a starting base point with no EQ it could be alot worse. I personally wouldn't worry to much about the null at 56hz as it's pretty narrow in width and likely not noticed.

If you're going to be taking more measurements I'd recommend getting REW at Home Theater Shack. It's free and much easier than plotting them out manually after a short learning curve.

I know it's a beast and not fun to move around but if you have more placement options for the sub try each of those plotting the response and the compare them. You want the flattest response possible across the board. Even moving the sub a few inches can have an effect especially if it's in or near a corner as it looks like it might be from your hump at 20. That's also a big area to fill. You might find you get the best results by placing the sub as close to the listening position as possible, that should also help even out the response.

Don't worry about Audyssey quite yet. Work on getting the best response you can then when you've got some time you can start working with Audyssey. I recently received my new sub and used it without Audyssey for about a week. Ran it and it was a huge step back only after getting frustrated, quitting and then coming back week later when I had more time to work with it testing and measuring from different areas many times over did I achieve better results.

Actually it doesn't look all that terrible. I would think Audyssey would have helped level it out more but as a starting base point with no EQ it could be alot worse. I personally wouldn't worry to much about the null at 56hz as it's pretty narrow in width and likely not noticed.

If you're going to be taking more measurements I'd recommend getting REW at Home Theater Shack. It's free and much easier than plotting them out manually after a short learning curve.

I know it's a beast and not fun to move around but if you have more placement options for the sub try each of those plotting the response and the compare them. You want the flattest response possible across the board. Even moving the sub a few inches can have an effect especially if it's in or near a corner as it looks like it might be from your hump at 20. That's also a big area to fill. You might find you get the best results by placing the sub as close to the listening position as possible, that should also help even out the response.

Don't worry about Audyssey quite yet. Work on getting the best response you can then when you've got some time you can start working with Audyssey. I recently received my new sub and used it without Audyssey for about a week. Ran it and it was a huge step back only after getting frustrated, quitting and then coming back week later when I had more time to work with it testing and measuring from different areas many times over did I achieve better results.

Jakeman02,
I grabbed REW last week. I have to get a soundcard for my laptop and wire everything up.

I figured that I had the RS meter anyway. I just whipped up a quick Excell worksheet that did the chart plotting. It took 10 to 15 minutes for each line going from 10 through 100 HZ in 1 HZ increments.

Unfortunately the placement can't change much unless I throw some doylies on it call it an end table :)

you should never try to EQ up nulls. it is always a bad idea. where is the sub placed and have you tried the sub anywhere else? location can make a big difference in frequency response.

mcjasonb,
Is the theory behind EQing your sub the flattening of the peaks without regard to the valley's?

The Anti-Mode 8033 will cut a couple of peaks. Is this correct and will it help in my situation?

Thanks