Over the first hump (I think)

[brotsten]

Some of us are slower then others..... But, I believe I have generated a few graphs for the experts to have a look at.

I'm working on a dedicated theater, 34'Lx16'Wx10'H.

The sub, a Danley DT20 is located in the rear of the theater, laying horizontal, centered on a stage that is ~5'Lx16W about 10" high and filled with sand. The stage and walls have been treated with 1" thick duct liner for damping.

I calibrated my sound card per the help file.



I'm using an older RS SPL meter with your supplied cal file. Here is the first shot:



I ran the find peaks and created 12 filters that I uploaded to the FBQ2496. Here is a graph with both the filtered and unfiltered plots:



What do you think?

Brian

[brucek]

Good job..

All the filters to the right of the crossover are likely not needed. After the crossover the level drops fairly rapidly and as the frequency increases the mains will overwhelm the situation, so you can limit your peaks find routine to about 90-100Hz.

A useful tip. There is a filter sort button on the filter popup screen. Numbers them from 1 to 12 (low to high).

I would address that notch at ~22Hz. I would first move the sub away from its center positioning.

I would remove all the filters (1, 6, 4, 11, 10, 12, 3). Then perhaps use one to lower the small peak at ~72Hz. Then add the mains and check how it looks around the crossover.

brucek

[brotsten]

I moved the sub to the corner, but that was only about 3 feet with it laying horizontal, so I also positioned it in a vertical orientation. That allowed another 4 feet of lateral placement.

I raised the volume about 10db as REW said it would be more accurate. Still only the sub.



Post filtered:



Brian

[JohnM]

After you Assign Filters in REW click on "Optimise PK Gain & Q" to have REW adjust the filters for the best match to your measurement.

[brotsten]

I thought I did, but I will go back and recheck.

Brian