First equalization and having trouble.. anyone help please

[thewire]

The waterfalls are working again today but that is not what I have question about. Do you think I should place the bad subwoofer in the back center of the room and set it to reverse to the tame the null? It does not go away after I sit down now and moving them down the side walls does not help as far as I could tell from when I was not sitting.

The blue is both front corners and green is the right front corner and back center. I did not adjust the volume on the subwoofer after I moved it because I want to keep that setting sorry.



edit: It is about 3 feet off the back wall because I did not move the equipment rack where it is sitting.

My bad. Sorry for so many graphs. Here are the different mic positions up and forward a couple inches with the 25Hz extension. It was saying 22Hz for awhile the other day for some reason. That peak still seems to be there.

[thewire]

Here is a photo of the damaged C audiovideo 12" driver. I could sit the extra sub inside of the riser also.



edit: Correction. The driver is fine. The amplifier however is not fine.

[thewire]

I have not gotten many complaints from the back row since I added bass traps but I thought I would give some eq a try for them back there. I have not yet installed rear traps on the back center wall that I think I will need and I will ask about this over at the acoustics area when it is time that I am able to get some.

This is the measurements for the front row.



This is the measurements for the back row.



This is the averaged response and waterfall at all of the six seating locations. The filters are under 10dB.





This is the result at the seat where my father sits at with the filters on.

[thewire]

I have tried to get the the most low output and less high output by the corner placement and even boosting the dip at 60Hz. While the corners were not seemingly all that bad the dip bothers me. I moved the subs along the side walls as far as I could and then moved them back towards the corners until I got a good result. Wayne said it was alright before so it must be good. Then I added a curve at 30Hz to 50Hz. My subwoofer is supposed to have flat anechoic response around 30Hz (in-room 19Hz). I would not have difficulties to setup the house curve later on.

Waterfall
I raised the SPL on the graph because I was still getting some error messages that the computer noise was around 60dB - 63dB each time I measured. Filters are added.



Filters



Left and right subwoofers
My room is not symmetrical. The left subwoofer sits next to wall with rooms on the other side and inches from a doorway.



Result



Should I get more cables and eq the left and right separately? I think if there were a reason to that I qualify. Does it look bad? Is the eq to much?

[Wayne A. Pflughaupt]

What's your crossover frequency?

Regards,
Wayne

[thewire]

My crossover frequency is 80Hz. After I apply the eq it still says the level in my THX optimizer is 75dB. I wish I knew how to predict the crossover. I added my right speaker to the test with the same volume level and did a sweep and they matched levels. Is the slope to steep? I can move the dip area from 40Hz up to 60Hz by placement. This was where the dip (or null) seemed to get the most improvement. This is what the placement looks like except the rear surrounds face inwards not towards the seating.



I could move them more towards the corners some to improve the upper range above 50Hz but the dip or dips began to get lower. I had to turn up the level on the subwoofers from around 2:00 to about 3:00 after moving them from the corners.

I found the amplfier on the damaged subwoofer to be bad and not the driver itself.

Crystal Audio is sending me a 2nd subwoofer for the price of one while I wait for my refund from UPS Freight. If I can figure out what amplifier to replace in the damaged one I will have four subwoofers. I was thinking of getting a 300W bash amplifier for it but I am worried they will not match. The subwoofer driver is rated for 400W and the original amp is 200W RMS.

BestBuy just called me to inform me they are crediting the cost of my receiver back to me because it will cost more to repair it and I need to go the store.

[Wayne A. Pflughaupt]

thewire wrote:

My crossover frequency is 80Hz.

Okay - I guess you have your reasons for doing the house curve from 30-50 Hz...

After filters it looks pretty good, except that you might want to turn up the subs a bit.

Regards,
Wayne

[thewire]

I found another 200W RMS subwoofer amplifier. I will have to see what happens. When I stacked two together on their sides in the center of the room I got 22Hz flat and +3dB gain before I changed settings in REW and applied eq. 22Hz is what I always hear when I run sweeps in DVE although the subwoofer starts moving sooner. If I stack them next to each other it might be better but stacking them vertical had no significance on the extension in places I tested.

If I line two in a horizontal array on each side of the room or stack them.....horizontally vertical, I might have something like +9dB and be able to use the 25Hz house curve. It should require about +1dB gain adjustment on each sub to make up for the loss of the corners and the signal being an extra -5dB low. That is my prediction. The additional air displacement will certainly help that curve or the next.

Here are the settings I used for the above measurements.

[thewire]

These graphs will look very different now that one amplifier has no limiter. There is still about 9dB headroom after six filters. This is two subwoofers on the left side of the room.

[thewire]

I tested the new setup this morning and it was really awful. It had to be one of the worst sub setups ever. That is saying allot also because my last HT had no room treatments or any eq. Problems were:

- Able to localize air movement
- No spacial envelopment
- Running amps hot
- Sounded very boomy
- No distinguishable improvement to achieving a flat response
- I would not listen to music like this.

I moved both subwoofers to each side of my left speaker and was able to turn down the volume again this time to an area that the subwoofers performs better at for reference level. I did a new calibration of the SPL meter using DVE and turned down the level of the one closest to the seating position to be 75dB. I left the one in the corner alone for right now but I think it is near 2dB higher. I remeasured and applied the new six filters that REW suggested. I checked with the 80Hz crossover on the new sub amp and there are no peaks above my crossover that REW wants to deal with. There are none for my mains also for that matter. It sounds much better now. Now I just need to treat that 60Hz area. This would most undoubtedly be the left walls for the equipment closet for which no insulation was put it by the builder. I just checked them. I will have to get some blown insulation or install some other kind when the walls get redone soon. This was a quick calibration because there are more subdudes on the way for the one in the corner and the next two will be here soon also.