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Measuring Room Acoustics
Old 26th September 2016
  #181
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JayTee4303's Avatar
Thanks Dan! For the specifics,and the thread itself.
Old 5th October 2016
  #182
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thank you
Old 16th March 2017
  #183
Here for the gear
 

Thank you for this thread.

Before I head down the path to get the software and hardware for measuring, I want to make sure I'm not spinning my wheels.

I have a Mac but can run Windows if I need to.

So, has their been any software / hardware updated recommendations? Thanks!

GT
Old 16th March 2017
  #184
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DanDan's Avatar
 

Thread Starter
FuzzMeasure

FuzzMeasure has been developing and continues to do so.
There are also iOS options at Faber and StudioSixDigital.
DD
Old 16th March 2017
  #185
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jhbrandt's Avatar
Quote:
Originally Posted by GTHill View Post
Thank you for this thread.

Before I head down the path to get the software and hardware for measuring, I want to make sure I'm not spinning my wheels.

I have a Mac but can run Windows if I need to.

So, has their been any software / hardware updated recommendations? Thanks!

GT
Fuzz only works on a Mac.

REW works on both. You will need buy a $75 USB microphone - highly recommended - from minidsp.

If you are working with a consultant, you can send him/her your mdat file for review. It's universal.

REW is free, but I also recommend strongly that you donate.

My 2 cents.
Cheers,
John
Old 16th March 2017
  #186
Here for the gear
 

Thanks John. Ordered microphone, downloaded and donated. Thanks!

GT


Quote:
Originally Posted by jhbrandt View Post
Fuzz only works on a Mac.

REW works on both. You will need buy a $75 USB microphone - highly recommended - from minidsp.

If you are working with a consultant, you can send him/her your mdat file for review. It's universal.

REW is free, but I also recommend strongly that you donate.

My 2 cents.
Cheers,
John
Old 16th March 2017
  #187
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DanDan's Avatar
 

Thread Starter
Seconded

+1 to all of that from John. The UMIK has held up very well in comparison with Bruel and Kjaer gear here.
REW currently seems stable across a range of Macs and OSX versions. In the past there were issues, fatal ones, because Apple were not complying with Java protocols. JohnPM, REW creator, sidestepped that by building Java into the current Mac REW.
However, there are still issues with particular interfaces or their drivers. e.g. RME, Firewire.
The very useful USB Mic can circumvent many of those, with playback via the Mac Line out. No interface.

REW has an extremely comprehensive feature set, it's like a Lab.

But FuzzMeasure has it's own fortes. Multichannel recording. Good for Stereo sampling using Jecklin Disc or even Dummy Head techniques. Can even do 8 mics simultaneously if you have the gear. Ditto playback, this is surround capable. FM also has the ability to generate a sweep which we can send to a client. They record the result, send back the audio, we convolute in FM. i.e. The client needs no skill nor software nor hardware other than normal recording.

Both apps can Export and Import IR's which the other can read. I would expect the iOS apps to be similarly capable.

All good.

DD
Old 15th May 2017
  #188
Here for the gear
 

Thanks DanDan, massively helpful info here, got me started on treating/testing my room further. However, I'm kind of stuck at the moment, struggling for what to next/how to make useful changes.

Using REW, I've tested the room from the listening position, and have come up with the following results:


https://www.dropbox.com/s/slgbr5l999...thing.jpg?dl=0


https://www.dropbox.com/s/n125abatsf...%20IR.wav?dl=0

I included the IR as people seemed to be requesting different resolutions of smoothing, hopefully this will get me closer to the finished room!

Some more info:

the room is floated, wooden floor, and rectangular (more or less), in shape. Dimensions are about 3m x 4.5 x 4m (WxLxH), and I'm firing down the long axis of the room. Monitors are approximately 2 feet from the wall, I actually moved them closer to the wall as it really seemed to improve low end response, which is what I'm having the most issue with. I have fairly large peaks and dips up to about 200 it seems, then some funny business around 500.

Currently there is a cloud, two large corner bass traps (superchunks, which I felt do very little, as we removed them to test what they were doing) then 6 broadband traps evenly distributed in the room. It's not badly treated already.

Regardless, I'm kind of stuck about how to progress from here, being as far as possible from an acoustician myself, I'd like to instil confidence when working in here.

Any help is massively appreciated, pictures can be supplied too.
Old 17th May 2017
  #189
Gear Nut
 

Hi TSLL
I got some great results with positioning a little while back see my thread for more details
https://www.gearslutz.com/board/stud...s-my-room.html

it does get frustrating and you start to question what your doing but if you find the best placement for your speakers it may halve your problem.
so my results were better with the speakers closer to the wall and closer together initially i had them in the corners the diagram of my room with dimensions is on the first page of the post.

since that post I have put in super chunks into the four corners when i get some time i will post the graphs to show the effectiveness, in my case the super chunks didn’t make the difference I thought they would on the frequency graph but more on the waterfall graph the low end in my room is much tighter now.
good luck
Old 19th May 2017
  #190
Here for the gear
 

Thanks Shak, I appreciate the info. Seems like a similar deal to mine, I've just been reading through your thread, and getting my thoughts together from there. I'll update as soon as I get further along with testing and treating. Too much work and too little time at the moment!
Old 30th May 2017
  #191
Gear Addict
 
kgveteran's Avatar
 

Anyone interested in discussing Impulse Response inregards to locating reflections. Here is a screen shot i took of my right speaker from the LP. Rumor is the first 10ms will give you the result you are looking for ?

The room is 19' front to back, 13' side to side, ceiling is vaulted, 18" above the 8' wall, the peak runs front to back. I sit 13' from the front wall (screen wall).

Old 31st May 2017
  #192
Quote:
Originally Posted by kgveteran View Post
Anyone interested in discussing Impulse Response inregards to locating reflections. Here is a screen shot i took of my right speaker from the LP. Rumor is the first 10ms will give you the result you are looking for ?

The room is 19' front to back, 13' side to side, ceiling is vaulted, 18" above the 8' wall, the peak runs front to back. I sit 13' from the front wall (screen wall).

You would get better response if you post your MDAT file with you question.
Old 31st May 2017
  #193
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kgveteran's Avatar
 

Quote:
Originally Posted by philsaudio View Post
You would get better response if you post your MDAT file with you question.
I fear to ask what a MDAT file is.......I searched and found very little explanations
Old 31st May 2017
  #194
Lives for gear
 

Exporting Impulse

Quote:
Originally Posted by kgveteran View Post
I fear to ask what a MDAT file is.......I searched and found very little explanations
.mdat is the file format REW software is using. Seems like you have Omnimic.
Is there a way of exporting IR (as .wav-file) from your software?
Old 31st May 2017
  #195
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kgveteran's Avatar
 

Quote:
Originally Posted by akebrake View Post
.mdat is the file format REW software is using. Seems like you have Omnimic.
Is there a way of exporting IR (as .wav-file) from your software?
Has to be a way, i will figure that out. In the mean time, can you explain how it will help others interpret the graphs, having this file ? How is this file used to do this ?
Old 1st June 2017
  #196
Quote:
Originally Posted by kgveteran View Post
Has to be a way, i will figure that out. In the mean time, can you explain how it will help others interpret the graphs, having this file ? How is this file used to do this ?
You can download REW5.1 for free. If we have the impulses (,mdat) we can manipulate them in REW or Fuzzmeasure.

People like Akbrake are like sending your MRI to a brain surgeon specialist when your doctor is just an xray tech. They can then can find your tumor; take a snapshot of your tumor; and send you detailed instructions on what to do next.

Just do it.
Old 3rd June 2017
  #197
Gear Addict
 
kgveteran's Avatar
 

Quote:
Originally Posted by philsaudio View Post
You can download REW5.1 for free. If we have the impulses (,mdat) we can manipulate them in REW or Fuzzmeasure.

People like Akbrake are like sending your MRI to a brain surgeon specialist when your doctor is just an xray tech. They can then can find your tumor; take a snapshot of your tumor; and send you detailed instructions on what to do next.

Just do it.
Sounds good, i have to see if my USB mic from omnimic is capable to work with REW.

*****there is a professional installer on another forum who believes the whole first reflection theory is wrong, and having reflections make for a more spacious room in his installed hometheaters :0/
I will do a nice A/B inregards to both with graphs soon enough, and some Objective/Subjectives*****
Old 4th June 2017
  #198
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Quote:
Originally Posted by kgveteran View Post
*****there is a professional installer on another forum who believes the whole first reflection theory is wrong, and having reflections make for a more spacious room in his installed hometheaters :0/
I will do a nice A/B inregards to both with graphs soon enough, and some Objective/Subjectives*****
More early reflections will create more spaciousness. AFAIK there is no debate or scientific disagreement about that.

The question is: In your listening room, living room or home theatre, how much spaciousness do you prefer? Driven by the speakers or occupants?

A listening room (for entertainment) is usually different from a control room. Different demands. Coffee table in stead of SSL console

Often one have to accept that possible acoustical design depends on isolation, size, shape, doors, windows, furniture, speakers (2.0 or more), visual appearence, prefered listening distance, WAF, budget...

Cheers

RE Omnimik. See this (long) thread where Jim uses Omnimic in different ways.
https://www.gearslutz.com/board/stud...ml#post8800766
Old 7th June 2017
  #199
Gear Head
 

Can someone help me figure out this REQ measure?

Hi.

I would love if someone would help me understand this measure and what to do if it.
Attached Thumbnails
Measuring Room Acoustics-meassure-7_6_2017.jpg  
Old 1 week ago
  #200
Quote:
Originally Posted by ydaffan View Post
Hi.

I would love if someone would help me understand this measure and what to do if it.
It would help if you would zoom in vertically and repost. Maybe bring your 50 dB down to the bottom of the graph (?) It's hard to see what's going on.
Old 1 week ago
  #201
Gear Guru
 
DanDan's Avatar
 

Thread Starter
Primed

I am a little disappointed to that the Primer which is meant to address such questions sometimes doesn't work! Probably best to ask for individual advice in a new thread. Post your measurement file, .mdat, with a request for help analysing it. Many GS are very helpful and will 'read' your data and explain what it says about the room response.
DD
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