room acoustic problems

[sabnzbd]

Hello,
I'm new here on the forums. I'm trying to build a studio in my basement.
I have tried to improve the acoustics, but there are still some problems. I have calibrated
roomeqwizard for my microphone, calibrated using a spl meter and calculated the soundcard frequency response.
The speakers i use are mackie hr 824 mkII's and are put on the sides to make a better base response.
here is the room drawn in google sketch.

the sizes of the room and the listening position is measured, the other things on the images are just to give an idea of where the room looks like. I have used the 38 percent rule.
The height of the room is 210 centimeters, 83 inches. The frequency response:

and here a picture of the room:

i have treated the room with studiofoam which is 4 inch thick. it's covered everywhere on the walls and even the door. But I think this is not thick enough for the corners and for low frequencies,
so I need some basstraps right?
If anyone could help me with solving this problem, it would be very nice.

[Ethan Winer]

Originally Posted by sabnzbd

so I need some basstraps right?

Right.

If anyone could help me with solving this problem, it would be very nice.

There are many threads here about bass traps. Or just read my Acoustics FAQ which has all of the info you need in one place.

--Ethan

[Drumhum]

Mackies on their sides for better bass response?

[sabnzbd]

Originally Posted by Drumhum

Mackies on their sides for better bass response?

yes, i read it on this site that it should sound better when the speakers are put on their sides. I believe it is true, it sounds like it has less bass then.

[Weasel9992]

Originally Posted by sabnzbd

yes, i read it on this site that it should sound better when the speakers are put on their sides. I believe it is true, it sounds like it has less bass then.

I have no idea why that would be true, but moving on...

Wow...that's a lot of foam. Most of that should be replaced by bass trapping, quite honestly. Foam, no matter how thick, won't do anything useful in terms of bass trapping.

Frank

[Drumhum]

Originally Posted by sabnzbd

yes, i read it on this site that it should sound better when the speakers are put on their sides. I believe it is true, it sounds like it has less bass then.

More bass? maybe.
Accurate? unlikely.

As you move your head left-right or right left (ie horizontal plane - the way you would move while sitting) the alignment of the woofer and tweeter remains the same for vertical orientation. The way you have them the alignment of the speaker drivers changes with movement.

Put it another way
Why do 99.9% of loudspeakers have their tweeters located above the woofers?

If they sounded better this way why don't mackie put the logos/graphics this way round?

Surely a speaker designer would try to get customers to do the "best way" by default.

Vertical is best. Not always the most practical - like when on a board's meter bridge in front of the mains.

Don't believe everything you read in forums. (so perhaps I'm making this up? ....sounds of The Twilight Zone to fade...)

[Weasel9992]

Originally Posted by Drumhum

More bass? maybe.
Accurate? unlikely.

As you move your head left-right or right left (ie horizontal plane - the way you would move while sitting) the alignment of the woofer and tweeter remains the same for vertical orientation. The way you have them the alignment of the speaker drivers changes with movement.

Put it another way
Why do 99.9% of loudspeakers have their tweeters located above the woofers?

If they sounded better this way why don't mackie put the logos/graphics this way round?

Surely a speaker designer would try to get customers to do the "best way" by default.

Vertical is best. Not always the most practical - like when on a board's meter bridge in front of the mains.

Don't believe everything you read in forums. (so perhaps I'm making this up? ....sounds of The Twilight Zone to fade...)

Very well put. As I said, I don't know why you would get more bass...those speakers aren't designed to be placed on their sides.

Frank

[Drumhum]

Just to stick my oar in even more...

Looking at your plan, I'd try and get those speakers further back a foot or so. They look a bit close and far apart from the pics. If you draw lines between the monitors and your head you want to be (ideally) making an equilateral triangle.

You computer monitors might get in the way, if you have the speakers further back though. Could you put one (or two) of them on the keyboard shelf? Personally, I can't have my computer monitors so high - it would give me too much neck ache!

Just a thought. Hope you don't mind the interference. Nothing to do with your original question of course

[sabnzbd]

Originally Posted by Drumhum

Just to stick my oar in even more...

Looking at your plan, I'd try and get those speakers further back a foot or so. They look a bit close and far apart from the pics. If you draw lines between the monitors and your head you want to be (ideally) making an equilateral triangle.

You computer monitors might get in the way, if you have the speakers further back though. Could you put one (or two) of them on the keyboard shelf? Personally, I can't have my computer monitors so high - it would give me too much neck ache!

Just a thought. Hope you don't mind the interference. Nothing to do with your original question of course

No i don't mind the interference, this is a chance to improve the placement of the speakers as well
I have done that and the frequency response has changed in a good way i think.

i've here got a picture of how the placement of the speakers look:

I have placed the speakers vertically though. It did sounded somewhat like the high was more in place.
I have not put the speakers more to the back, but shortened the distance between them. there is 150 cm between them,
so the listening distance has to be 2 * width * tan (30) = 173 cm which i used to measure the frequency response

But there still are some gaps in the frequency response in the low area.
I was thinking about building panel bass traps, like in the how i built my basstraps
thread.
Can i place these panel basstraps in front of the foam i've got,
or do i have to remove it again?