Acoustic Fields - Forum: Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/ Simple:Press Version 6.6.1 Dennis Foley on Acoustical measurement tools Acoustic Fields uses https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/acoustical-measurement-tools-acoustic-fields-uses/#p1154 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/acoustical-measurement-tools-acoustic-fields-uses/#p1154 We have our own testing gear that has been modified to work with our carbon technology. We guarantee our room responses + - 2 dB depending on usage requirements.

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Wed, 21 Oct 2020 15:51:34 -0700
arkytype on Acoustical measurement tools Acoustic Fields uses https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/acoustical-measurement-tools-acoustic-fields-uses/#p1153 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/acoustical-measurement-tools-acoustic-fields-uses/#p1153 Dennis,

What measuring instruments & tools (microphones, SLM, software, etc.) do you use when working with a client hands-on? How do you measure reverb time in a client's space?

What acoustical characteristics of a client's listening room
/home theater
/recording studio
do you guarantee will be met or exceeded?

Thanks. Enjoy your videos
and other resources.

Lee

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Sat, 17 Oct 2020 16:05:11 -0700
Mads1693 on QRDude calculator https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1147 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1147 Thank you Dennis! Great stuff..

I've bought the plans now.

I'm in doubt if my room is too small for effective diffusion.

I'm building a home theater
where you have the dimension 5,1 m x 4,3 m x 2,7 m. I've learned that I have to treat LFE first. Planning on absorption
on sides and maybe diaphragmatic bass trap in 2 cornes.

My seating is aprox 1 m from the rear wall. Is that enough for a Q7D to work, or how far should I sit? You say 1,5-2 times deepest well wavelenght. Others say 3 times, and say I should go with absorption
. I'm confused :) I've filled the roomanalisys btw :)

Mads

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Mon, 28 Sep 2020 11:27:14 -0700
Dennis Foley on QRDude calculator https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1146 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1146 Stay with the standard prime number diffusers. You can find all of them laid out to build in our DIY build plans
. https://www.acousticfields.com.....s-package/

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Mon, 28 Sep 2020 06:29:38 -0700
Mads1693 on QRDude calculator https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1145 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/qrdude-calculator/#p1145 Hi Dennis,

It seems to me that you have to consider both prime number, depth and width in determining your frequency-response range, correct?

If I want to be able to calculate this myself, how should I do this?

I've found this:

http://www.mh-audio.nl/Acousti.....asp#calcul

Would that be accurate enough?

Thx!

Mads

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Sun, 27 Sep 2020 11:12:54 -0700
vladfisco on Do It Yourself Room Analysis https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/do-it-yourself-room-analysis/#p1106 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/do-it-yourself-room-analysis/#p1106 Room size is:
Length: 17.06'
Width: 11.28'
Height: 8.46'

I have the Window on the back wall (in my back) = Length 6.39' x height 4.46'
Door (on the left wall, unfortunatly on the left of me kinda at the first reflection) = Length 6.56' x height 2.62'

Floor: lamiated parquet
Walls: poured concrete and is 0.5'
+ back wall (the one with the window) is 1.8'

Room usage: Video editing (audio also for advertising, documentaries etc), Recording 1-2 persons podcast and mixing that audio.
Speakers: 2 channels Tannoy Gold 8.
Microphone for voice recording: Shure SM7B

I would like also to soundproof a little bit for not getting sound out. Getting sound from "outside" the room, at the hours that I am working in, is not really an issue.

Room plan: https://ibb.co/vYP6wBZ

Any recommandation is welcomed.

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Wed, 29 Jul 2020 17:44:50 -0700
vladfisco on Do It Yourself Room Analysis https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/do-it-yourself-room-analysis/#p1105 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/do-it-yourself-room-analysis/#p1105 Hi,

I've been sending the date for room analysis
but with no feedback for weeks. I send it again today.

I am sure you are very busy with everything, I can understand that. I am thinking of buying the DIY book and make the panels ourselves as we are in different countries (Europe) and shipment we think will be very very expensive...

I wonder if in the eBook are all the details for analysing the room so we know what to build and where to install it. Or how do we go about this analysis?

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Wed, 29 Jul 2020 17:10:54 -0700
vladfisco on Possible error in foot vs meter conversion for "Good Sound Room Volumes" Chart https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/possible-error-in-foot-vs-meter-conversion-for-good-sound-room-volumes-chart/#p1104 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/possible-error-in-foot-vs-meter-conversion-for-good-sound-room-volumes-chart/#p1104 Looking over the optimal room sizes, I saw two images that you present (one with dimensions in inch and another one in metric system). Coming from Europe (where the metric system is used) I believe there is an error in your conversion from foot to meters.

9' is about 2.7432 meter, not 2.43 meter as presented in the image. And so on, all of the conversions are in error.

Am I missing something or is this an error?

Best regards, keep up the good work!

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Wed, 29 Jul 2020 17:06:22 -0700
Dennis Foley on Room mode: is it expected to have such a difference between dBA and dBC? https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/room-mode-is-it-expected-to-have-such-a-difference-between-dba-and-dbc/#p1103 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/room-mode-is-it-expected-to-have-such-a-difference-between-dba-and-dbc/#p1103 S, The frequency response of the male voice starts at 90 Hz. You must choose room dimensions that will support that wavelength.

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Wed, 29 Jul 2020 14:05:18 -0700
Dennis Foley on Predicting RT60 from a Photograph Using Artificial Intelligence https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/predicting-rt60-from-a-photograph-using-artificial-intelligence/#p1102 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/predicting-rt60-from-a-photograph-using-artificial-intelligence/#p1102 P, Rt-60 times are volume, distance, and material composition dependent. No AI required.

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Wed, 29 Jul 2020 14:02:51 -0700
palebluedotdoor on Predicting RT60 from a Photograph Using Artificial Intelligence https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/predicting-rt60-from-a-photograph-using-artificial-intelligence/#p1056 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/predicting-rt60-from-a-photograph-using-artificial-intelligence/#p1056 Hi! I'm currently working on my dissertation based on the question, Can Artificial Intelligence Be Used to Predict RT60 from a Photograph?

I would love to ask for your help and involvment with my project by taking part in this short survey designed to test how well humans can predict RT60 from photographs for use in comparison against the AI.

Survey: https://forms.gle/7AG45fwRH7MpT5or6

Your involvement contributes to the study of Artificial Intelligence within the Audio and Acoustics field...

Thank you!

I'd also be happy to answer any questions here or feel free to go to the Reddit post to join the discussion over there:

Artificial Intelligence Estimation of RT60 Project from audioengineering

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Wed, 22 Apr 2020 03:42:35 -0700
Sylvain Leroux on Room mode: is it expected to have such a difference between dBA and dBC? https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/room-mode-is-it-expected-to-have-such-a-difference-between-dba-and-dbc/#p1021 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/room-mode-is-it-expected-to-have-such-a-difference-between-dba-and-dbc/#p1021 I'm converting a spare room to a recording studio
for voice over and youtube videos
. I did some preliminary studies of the room's acoustics based on the procedure explain by Denis on the video "Recording Room Mode, part II"

If you look in the comment section at the bottom of the video, you will see I mistakenly set my audiometer to dBA instead of dBC (that latter being the same thing as dB SPL if I understood it well).
So, I took a second set of measurements with the right setting this time.

I took *great* cares to ensure all the devices were calibrated exactly the same as in my initial testing. I expected _some_ difference in the results. But they are indeed _very_ different. Here is a link to a graphical view of the results:

https://www.chicoree.fr/pub/ac.....s/mode.jpg

mode.jpgImage Enlarger

The room is 6.35m x 2.9m (x2.4m height at its max -- but it's an attic room)

That raises several questions to my mind.

(1) first, do both sets of measurements seem coherent to you? Or is this "obviously wrong"?
(2) for voice-only work, are low frequencies (<125Hz) as critical as they are for music?
(3) should I need to care about "room mode" for _recording_, knowing the talent will mic'd with a lavalier, and positioned were I put my speaker for the tests?

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Tue, 25 Feb 2020 11:31:08 -0800
Skogs on What Frequency Range Should I Diffuse ? https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p992 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p992 I will have to respectfully disagree with you there Dennis. Specular reflection from one plane will cause peaks and dips in the frequency response, because all the energy will arrive with a specific time delay in respect to the source. Depending on this time delay, some frequencies will cause destructive and some will cause constructive interference, causing peaks and dips.

A properly designed and built QRD will spread that same energy out in time, this will create a more even interference-pattern. There will no longer be certain frequencies where all the reflected energy has a perfect 180deg phase shift caused by a single time delay.

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Fri, 17 Jan 2020 11:02:46 -0800
Dennis Foley on What Frequency Range Should I Diffuse ? https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p989 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p989 S, Diffusers
can not add anything to the room response other than higher Rt-60 times.

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Wed, 15 Jan 2020 10:14:27 -0800
Skogs on What Frequency Range Should I Diffuse ? https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p987 Calculation and Analysis Tools https://www.acousticfields.com/acoustics-forum/calculation-and-analysis-tools/what-frequency-range-should-i-diffuse/#p987 Dennis,

Are you sure about this? It seems to me that nadeau777 was on the right path with his suggestion.

As far as i know, the very main purpose of phase grating is to keep the energy within the room without disturbing the frequency response, by spreading the energy out in time.

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Mon, 13 Jan 2020 13:14:35 -0800