DCX2496 EQ Tips... Does anyone had success with Equalization of bass is Small Rooms?

[gedlee]

Ok Dr. Geddes, no problem because I can run windows on my mac with Parallels. What are the adjustments for the holm? what should I look for and how to take exactly each measurement?

Thx

Didn't I send you a paper outlining the measurements?

 

[murillollirum]

This is the best I can do...

View image: Sem Título 1

 

[murillollirum]

Didn't I send you a paper outlining the measurements?

yes, I forgot, I will search it. thx

 

[murillollirum]

these links are easier to open:

Waterfall showing my ringing room...
http://postimg.org/image/fqdggwjut/

sub 1 Dayton near the listening position
View image: Captura de Tela 2013 04 17 às 22 09 52

sub 2 SVS in the back wall corner
View image: Captura de Tela 2013 04 17 às 22 10 10

sub 3 Dyton in the backwall, not corner
View image: Captura de Tela 2013 04 17 às 22 10 18

sub1, 2 and 3 without the mains.
View image: Captura de Tela 2013 04 17 às 22 09 43

mains + sub1 ,sub2 and sub3
View image: Captura de Tela 2013 04 17 às 22 09 33

sub 1 with 90 phase invert, sub 2 with 180 phase invert and sub 3 normal phase
View image: Captura de Tela 2013 04 17 às 22 10 27

all measurements
View image: Captura de Tela 2013 04 17 às 22 09 14

 

[murillollirum]

Today I sent to Dr. Geddes all measurements with HOLME software for his analysis. Just a initial take because he certainly will ask me to do it again...

 

[murillollirum]

Not sure what you're trying to do. Multiple subs and near field sub are two different approaches.

Could you post a floor plan?

here it is Markus, View image: Sem Título 1

 

[markus76]

Thanks.
Could you put one sub directly behind the listening chair. It should be at shoulder height as close as possible to your ears. Disconnect all other subs. Then measure the response at the listening position where your head would be.

 

[markus76]

...and please post the .mdat

 

[murillollirum]

...and please post the .mdat

ok, I will do that.

 

[murillollirum]

today I will post my new measurements.

 

[markus76]

When is "today"?

 

[murillollirum]

Sorry Markus and Dr. Geddes but I had been sick and could not do nothing. now, finally I'm very well and will do the measurements. I will do it today april, 29 and post it the results and also attach the raw data. Murillo

 

[murillollirum]

this are my new measurements.
As oriented by Dr. Geddes, I repositioned my 3rd sub, the one that it's near me, so I placed in the left side wall, at 1/3 the corner.
The measurements are done with HOLM and REW, also I measured with an Ipad software that has a FFT from studio six digital.
There is no EQ or delay adjust at the DCX.
Something that I'm little confused is with the output loudness, how I calculate the best volume to measure? I'm using the volume I used to listen, but I'm not certain hat this is the correct approach.

Now lets listen to the Audio GURUs...



the 3 subs without the mains, phases zero.


the 3 subs without the mains, phases inverted 180.

 

[murillollirum]

I'm trying to post the files but there is a message telling that a token is missing. So Markus, I will try to send you in a pm. The holm I will send to Dr. Geddes email. Markus, what's your email? can you tell me in a pm?

 

[murillollirum]

Rew measurements.

 

[markus76]

There doesn't seem to be much low frequency output at all?

Did you try the near field configuration described at http://www.diyaudio.com/forums/mult...alization-bass-small-rooms-5.html#post3458938

P.S. Zip the .mdat and upload it here (if it's within file size limits).

 

[Pano]

There doesn't seem to be much low frequency output at all?

Agreed. The F3 of the "sub" seems to be about 48-50Hz. That's fine for most stuff, no problem. But not really what I'd call a subwoofer, except in a very small system.

 

[Pano]

View attachment 345563
the 3 subs without the mains, phases inverted 180.

Can you switch polarity separately on the subs? You might find a combination of polarities that give you a smoother response. Worth a try.

 

[bodo]

Simulation of your room

I tried to simulate your room with an online version of a room simulator located at Lautsprecher Rechner - AUDIO . I "moved" 3 subs until I got the smoothest response fo your listening position.
I ended up with one sub in the front right corner, on sub in the left back corner and one sub on right wall 2 meters away from the front right corner.

 

[bodo]

Simulation of your room

Here comes a snapshot of the simulation. I used 3 Klipsch SW110 as replacement for your custom subs.

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Bodo