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my first measurements
Old 11th September 2019
  #1
Gear Nut
 

my first measurements

Hello all

I have made my first acoustic measurements of my room (5 meters long, 3 meters wide, 2.2 meters height in front of the room, and 196cm in back of the room)

everything is sat to flat to measure, im using aps aeon monitors.
so far my acoustic treatment consist of 40cm caruso 045 stacked in front corners.

Monitors are as close to front wall, ( witch has window in it not perfectly centered)

There is huge dip in 90-100 ish area...

im attaching REW data file, hope it provide more information

Any help appreciated, Thank you
Attached Thumbnails
my first measurements-20190911_225446.jpg  
Attached Files
Old 12th September 2019
  #2
Please always measure L+R separately.

You can see that the corner bass traps already did a lot. Your 0-1-0 mode is already way down. The 1-0-0 mode also but not as much.

Your desk and ceiling reflections are pretty loud. Smaller desk? A ceiling cloud would help.

The side walls will also need treatment -- try 20, then 30 cm of the same WLG045.
Old 12th September 2019
  #3
Gear Nut
 

Quote:
Originally Posted by johannburkard View Post
Please always measure L+R separately.

You can see that the corner bass traps already did a lot. Your 0-1-0 mode is already way down. The 1-0-0 mode also but not as much.

Your desk and ceiling reflections are pretty loud. Smaller desk? A ceiling cloud would help.

The side walls will also need treatment -- try 20, then 30 cm of the same WLG045.

Thank you Johannburkard for your response

L and R separately hm.. i dont see this option in rew..

Smaller desk, i will consider that. im still figuring out the correct placement of speakers..

Should i apply eq on my monitors to dial down low frequencies?
Old 12th September 2019
  #4
Lives for gear
 

Quote:
L and R separately hm.. i dont see this option in rew..
Turn off one speaker while you measure with the other one, then switch. Also, read this:

How to calibrate and use REW to test and tune your room acoustics

- Stuart -
Old 12th September 2019
  #5
Quote:
Originally Posted by gedna View Post
L and R separately hm.. i dont see this option in rew..
Just select L and R outputs when you click measure.
Old 12th September 2019
  #6
Gear Nut
 

Thank you both i have made the correct measurements ( i think..)

Hope it helps

Thank you again
Attached Files
File Type: mdat Gediminas_test_1.mdat (7.41 MB, 11 views)
Old 12th September 2019
  #7
You've got really good L+R amplitude symmetry which is good. I would probably work on the hole between 70-120 Hz next.
Old 15th September 2019
  #8
Gear Nut
 

Quote:
Originally Posted by johannburkard View Post
You've got really good L+R amplitude symmetry which is good. I would probably work on the hole between 70-120 Hz next.
Thank you, any idea or thoughts how to correct the dip?
Old 15th September 2019
  #9
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akebrake's Avatar
 

Quote:
Originally Posted by gedna View Post
Thank you both i have made the correct measurements ( i think..) ...
Well... If one zooms in on the Impulse it looks like "ringing" which might indicate something is not correct with the measurement.
my first measurements-l-gedma-impulse.jpg
IMHO it's important to sort that out before one start hunting for e.g. reflections which are often the cause of frequency response-dips.

What kind of mic is used? (USB or analog with a preamp+ 48V).
Is monitoring switched off ?
Can you make/include a Soundcard Calibration file?
Try using one sweep instead of two.

Then Upload the new mdat


Best
Attached Thumbnails
my first measurements-l-gedma-impulse.jpg  
Old 15th September 2019
  #10
Quote:
Originally Posted by gedna View Post
Thank you, any idea or thoughts how to correct the dip?
Try absorption.
Old 15th September 2019
  #11
Gear Nut
 

Quote:
Originally Posted by akebrake View Post
Well... If one zooms in on the Impulse it looks like "ringing" which might indicate something is not correct with the measurement.

IMHO it's important to sort that out before one start hunting for e.g. reflections which are often the cause of frequency response-dips.

What kind of mic is used? (USB or analog with a preamp+ 48V).
Is monitoring switched off ?
Can you make/include a Soundcard Calibration file?
Try using one sweep instead of two.

Then Upload the new mdat


Best
Akebrake thank you for your response

i made new measurement one sweep
Monitors are about as close to front wall as posible.. 1.25 meters apart,

im using Sonarworks Xref 20 mic (of course +48V enabled)

I did not calibrated sound card after some reading that its not really necessary...(am i wrong?) im using audient id4

What do you mean is monitoring switched off?


Thank you
Attached Files
File Type: mdat Gediminas_test_2.mdat (7.39 MB, 5 views)
Old 16th September 2019
  #12
Gear Nut
 

Hello all

I have made couple different measurements and moved my monitors around, i tested when the listening position is 38percent from front wall, then moved monitors closer to achieve triangle, and it looks ( im not expert on this) that measurements look better than before..
Attached Thumbnails
my first measurements-20190916_182144.jpg  
Attached Files
File Type: mdat Gediminas_test_3.mdat (7.36 MB, 5 views)
Old 16th September 2019
  #13
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akebrake's Avatar
 

Quote:
Originally Posted by gedna View Post
Akebrake thank you for your response
You're welcome!

Quote:
i made new measurement one sweep
Did not change the measurement, unfortunately

Quote:
Monitors are about as close to front wall as posible.. 1.25 meters apart, im using Sonarworks Xref 20 mic (of course +48V enabled)
OK thats fine

Quote:
I did not calibrated sound card after some reading that its not really necessary...(am i wrong?) im using audient id4
Sound Card Calibration is a ”health check” of your system. It can show Digital glitches, feedback and set up mistakes that makes a measurement non valid.
See this link:

https://www.avnirvana.com/threads/ex...oundcard.5547/

Quote:
What do you mean is monitoring switched off?
A better explanation would have been: Mute Input Monitoring or Direct Monitoring”.
When making a sweep you have to prevent feedback.

I guess you can turn your monitor mix control all the way to "DAW"
E.g. Mic signal should not be heard in the speakers.

Hope that helps
Old 16th September 2019
  #14
Gear Nut
 

Quote:
Originally Posted by akebrake View Post
You're welcome!



Did not change the measurement, unfortunately



OK thats fine


Sound Card Calibration is a ”health check” of your system. It can show Digital glitches, feedback and set up mistakes that makes a measurement non valid.
See this link:

https://www.avnirvana.com/threads/ex...oundcard.5547/



A better explanation would have been: Mute Input Monitoring or Direct Monitoring”.
When making a sweep you have to prevent feedback.

I guess you can turn your monitor mix control all the way to "DAW"
E.g. Mic signal should not be heard in the speakers.

Hope that helps
Yes direct monitoring is off, its completely to DAW side on my ID4 interface

My latest test is still not good enough?
Old 17th September 2019
  #15
Lives for gear
 
akebrake's Avatar
 

Two choices

Quote:
Originally Posted by gedna View Post
Yes direct monitoring is off, its completely to DAW side on my ID4 interface

My latest test is still not good enough?
Honestly, I don't know. The impulse don't looks familiar to me so I suspected there might be "something going on" in the digital communication between your computer, soundcard and REW.

Nowadays with different digital stuff (and no common word clock) one can expect clocking errors to show up occasionally on precision measuring tools.

Valid measurements is a good start.

Two choices:
1. Pretend everything is OK
2. Ask about it on AV Nirvana (REW support forum) where REW author (John Mulcahy) kindly helps many users.


My 0.02
Old 17th September 2019
  #16
Lives for gear
 
akebrake's Avatar
 

Before that...
Check your levels. Are you sweeping loud? Turn down the volume a little? Your distortion is quite high. Also turn down mic-pre gain a little.
Test again.
Old 17th September 2019
  #17
Lives for gear
the Sonarworks Xref 20 mic is usable only with his soft.

Change the mic.
Old 17th September 2019
  #18
Gear Nut
 

Quote:
Originally Posted by akebrake View Post
Before that...
Check your levels. Are you sweeping loud? Turn down the volume a little? Your distortion is quite high. Also turn down mic-pre gain a little.
Test again.
so my id4 playing games?

i made more measurements and if i move my speakers away from front wall about 30cm right now i think i get more "even" response, there is that dip on 80ish but not that steep...
Attached Files
Old 4 weeks ago
  #19
Lives for gear
 
akebrake's Avatar
 

Quote:
Originally Posted by gedna View Post
so my id4 playing games?
It' possible. I don't know...The ringing on the impulse is still there.

Dino might be right. Try another microphone.
It's also possible that your REW 19, Windows 10 or ASIO drivers don't like each other.

You can also try latest REW: 5.20 beta 24 or send a question to the REW author

(see post 15)

Best
Old 4 weeks ago
  #20
Gear Addict
 

Download ARTA demoversion and compare the measurements.
Old 4 weeks ago
  #21
Gear Nut
 

Quote:
Originally Posted by bert stoltenborg View Post
Download ARTA demoversion and compare the measurements.
ARTA basically give me the same results, huge dip in 80 ish area...

i made new measurements this time i tried to imitate REW room simulation to achieve best posible response by just repositioning my setup ( im not an expert ) i think its better, that Huge dip is gone, ( its still a lot in 70-100ish area) but not that steep.
Attached Thumbnails
my first measurements-screenshot-4-.jpg  
Attached Files
File Type: mdat ged_measure_9_24.mdat (4.50 MB, 5 views)
Old 3 weeks ago
  #22
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Matti's Avatar
Quote:
Originally Posted by dinococcus View Post
the Sonarworks Xref 20 mic is usable only with his soft.

Change the mic.
No, you can download calibration files for your mic to use with any software that reads them. -I have one

Matti
Old 3 weeks ago
  #23
Gear Nut
 

Quote:
Originally Posted by Matti View Post
No, you can download calibration files for your mic to use with any software that reads them. -I have one

Matti
Yes i have downloaded and used cal_0degree file with all my measurements
Old 3 weeks ago
  #24
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Matti's Avatar
Yep

M.
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