Have I posted this correctly?

[Daverich4]

The first time I posted one of these I did a number of things wrong so I'm trying again. Can someone tell me if this provides enough useful information for me to ask some questions about it? The Convolution file was created with Focus Fidelity with the Harmon Curve as the target. Thanks.

 

[Daverich4]

Would it be possible for someone to look at my graph and tell me if there’s something I can do about the dips? I have GIK Bass Traps in the front corners but I’m under the impression from reading threads here that isn’t actually a solution because bass wavelengths are so long. Would a pair of subwoofers appropriately placed help out at all? They can go on the side walls or front and back walls, wherever is the best location.

 

[staticV3]

Yes, multiple subwoofers definitely help smooth out the in-room bass response, even better if you use them in combination with Multi Sub Optimizer/Dirac Bass Control, and best of all if you use them with Dirac ART.

For the best positions in your room, check out REW's Room Sim.

 

[Daverich4]

Yes, multiple subwoofers definitely help smooth out the in-room bass response, even better if you use them in combination with Multi Sub Optimizer/Dirac Bass Control, and best of all if you use them with Dirac ART.

For the best positions in your room, check out REW's Room Sim.

My electronics are by Audio Research so I don’t have access to anything by Dirac. I do use REW so could try Room Sim as well as doing a Sub Crawl. It’s a dedicated room which means the subs could go anywhere that gave the best results.

 

[Daverich4]

I know you’re not supposed to try and eliminate dips using PEQ but would it be ok to try and raise them a little bit? Say, 2-3dB? If so, could someone suggest a Q setting to use in Roon? I’m only interested in the two biggest dips in the chart earlier in this thread. Thanks.

 

[pierre]

Do you have the raw measurements?

 

[Daverich4]

Do you have the raw measurements?

The Mdat file is posted with the graph. Is that what you meant?

 

[pierre]

The Mdat file is posted with the graph. Is that what you meant?

The measurements are smoothed and looks like post correction. Or is it before correction?

 

[Daverich4]

The measurements are smoothed and looks like post correction. Or is it before correction?

I used 1/6 smoothing. Both the before and after correction measurements are there.

 

[Flaesh]

look at my graph and tell me

I can say I wouldn't want to be in this room. I think so. When I see the RT chart.

They can go on .. front and back walls

Really!?)) Link in signature. See
What are the dimensions of the room? Almost 7 meters - is this the length? What is the room like in general?

 

[Daverich4]

I can say I wouldn't want to be in this room. I think so. When I see the RT chart.

Really!?)) Link in signature. See
What are the dimensions of the room? Almost 7 meters - is this the length? What is the room like in general?

I'm not sure where you're getting the room dimensions. It's 19'5' wide by 23' long. There is a 3' wide staircase coming down about a third of the back wall. On the same side of the room as the staircase is a 6' wide by 8' deep alcove for a small kitchen. The MLP is 8'4" from the back wall. The speakers are located on the short wall. The tweeters are 43" from the front wall and 115" apart. There are doors and windows in the room but I keep the doors closed and the windows covered with drapes when listening.

 

[Flaesh]

where you're getting the room dimensions

From your .mdat, first mode 24-25 Hz.
Is it possible to change MLP, have you tried it?
If you have two subs and delay - you mau try SSS configuration.

Off-topic, but I'd like to reduce reverberation time at hundreds of hertz.

 

[Chromatischism]

I'm not sure where you're getting the room dimensions. It's 19'5' wide by 23' long. There is a 3' wide staircase coming down about a third of the back wall. On the same side of the room as the staircase is a 6' wide by 8' deep alcove for a small kitchen. The MLP is 8'4" from the back wall. The speakers are located on the short wall. The tweeters are 43" from the front wall and 115" apart. There are doors and windows in the room but I keep the doors closed and the windows covered with drapes when listening.

This doesn't look like you are 8 ft from the back wall. Did you mean front wall?

I'll say it: this sub bass looks horrible. Honestly, the worst I have ever seen. EQ will not be the solution to this. I don't understand why it's so bad because your setup doesn't look bad to me.

Is this measurement L+R?

 

[Daverich4]

From your .mdat, first mode 24-25 Hz.
Is it possible to change MLP, have you tried it?
If you have two subs and delay - you mau try SSS configuration.

Off-topic, but I'd like to reduce reverberation time at hundreds of hertz.

I could move the MLP anywhere but the current one was determined by using Jim Smith's method using a UMIK 1 and a RTA. I don't have any subs at this point, just considering them.

 

[Daverich4]

This doesn't look like you are 8 ft from the back wall. Did you mean front wall?

I'll say it: this sub bass looks horrible. Honestly, the worst I have ever seen. EQ will not be the solution to this. I don't understand why it's so bad because your setup doesn't look bad to me.

Is this measurement L+R?

It's 8 feet from the back wall, approximately 1/3 of the way into the room. The measurements are L+R. If you look at the picture in Post 11 you can get a general feel of the room layout.

 

[Chromatischism]

It's 8 feet from the back wall, approximately 1/3 of the way into the room. The measurements are L+R. If you look at the picture in Post 11 you can get a general feel of the room layout.

Well, you are using a wide-angle lens so I assumed without the distortion you are much closer than it appears.

I don't see anything obviously wrong with how you've placed everything. But you're missing more than 20 dB in more than one area. I think you won't solve this without dual subs. One against the wall behind the rack, and one against the wall behind you. That will cancel most or all of these problems for you.

 

[Flaesh]

Jim Smith's method using a UMIK 1 and a RTA

What is this method? If we're talking about monitoring the RTA in real time while moving speakers and/or a microphone, it's a fairly ancient method; I don't know if its inventor is known. Was other places worse than this? The main part of the dip between 30 and 40 Hz is predictable; move the microphone forward and the dip will move up (and vice versa). Of course, a real room with niches and openings differs from a simple model.
I love it when people use solutions like mine, but 4-6-.. wall-mounted subwoofers (half of which you can't hear)) is a bit radical. And it's unknown how well the DBA will work in your room. This issue is discussed in more detail in my thread and other DBA threads.
The MSO approach is more common and has been widely written about.
In your case, I would first try to reduce the deeps by positioning speakers and MLP.

Not a single\any MSO or RC or smoothing was harmed in 30' * 14' room:

 

[Daverich4]

Well, you are using a wide-angle lens so I assumed without the distortion you are much closer than it appears.

I don't see anything obviously wrong with how you've placed everything. But you're missing more than 20 dB in more than one area. I think you won't solve this without dual subs. One against the wall behind the rack, and one against the wall behind you. That will cancel most or all of these problems for you.

You are correct about the photography. The room does look longer than it is. I did that to show that the post that was added to the room recently did not block the speaker from the listening position. The position you suggested for the subs is one that’s also on the Harman web site. They also suggested one on each of the side walls. It’s easy enough to experiment with the different locations to determine the best spot. Thanks for your post, I appreciate the assistance.