## Excel calculation file: Calculate STC, MTC, OITC and more

Mostly MS Excel spreadsheets. Most of those tools are free, provided by list members. Where applicable the links are also accessible via the Topics related folders (e.g. look at > Acoustics Info > Room mode

### Excel calculation file: Calculate STC, MTC, OITC and more

Excel calculation file: Calculate STC, MTC, OITC and more

Excel calculation file: Eric Desart - calculate insulation Drywalls
USNorms3.zip: Calculation and Standards Transmission Loss Walls: STC, MTC, OITC, Music standards, dB(A), dB(B), dB(C) + more info; NEW version; The calculation methods itself are explained in-depth in the related Word document: STC_MTC_OITC_RW.doc

Excel calculation file: Eric Desart - calculate insulation Drywalls
This is the MS Word document explaining the methods in depth: STC_MTC_OITC_RW.doc

Excel calculation files: Calculating Room Modes

Excel calculation file: LINKWITZ LAB - Room Modes

Excel calculation file: LINKWITZ LAB - Room Modes
Room Modes: Another approach to evaluate Room Modes as per averaged room spacing based on a BBC approach R.Walker 1996. Theoretical background to be found in othe document.

General info related to speakers, RT60, Critical Distance (Room Radius), Standing waves, Room Modes etc. Not too complex but good. This link includes the theoretical approach to the LINKWITZ LAB room modes Excel file.

WAVES and MODES a room resonance calculator
This is a Microsoft Excel program for the PC that calculates the resonance frequencies for rectangular rooms, and that shows graphically the sound pressure distributions along the major axes of the room.

Part Three: Getting the bass right
This is Part 3 of "Loudspeakers and Rooms for Multichannel Audio Reproduction" explaining the use of the Excel File
http://www.harman.com/wp/pdf/Loudspeakers&RoomsPt3.pdf

WAVES and MODES a room resonance calculator
This is a Microsoft Excel program for the PC that calculates the resonance frequencies for rectangular rooms, and that shows graphically the sound pressure distributions along the major axes of the room. To use it, type your room dimensions into the WAVES component of the calculator. The dimensions are automatically entered into MODES. Its use is explained in Part 3 of "Loudspeakers and Rooms for Multichannel Audio Reproduction".
http://www.harman.com/wp/pdf/Room%20Mod ... or2002.xls

Excel calculation file: Jeff D. Szymanski - Room Modes
is a spreadsheet from Jeff D. Szymanski that calculates normal room modes for rectangular spaces. Detailed instructions are included on the first sheet. A Bonello distribution curve is included with information on how to interpret the results.
http://www.studiotips.com/tools/MODESv2p.zip

Excel calculation file: Joe Etrick - Room Modes
Contributed by Smaart Pro user Joe Etrick of Professional Electronic Systems. Type: Microsoft Excel Worksheet file. Size: 50kb

Excel calculation file: Timber Slat type Helmholz Resonator

On-Line calculation tools
Several on line calculation tools are available (often in Java script).

Acoustics Software on-line
The software on the links below is provided without any guarantee whatsoever. A recent browser will be required to run Java or JavaScript programs. The software can also be saved and run offline.
http://www.measure.demon.co.uk/software.html

CALCULATORS ON-LINE CENTER
Currently the Calculators On-Line Center contains over "15,380" Calculators
http://www-sci.lib.uci.edu/HSG/RefCalculators4.html

Engineering Toolbox
Some interesting links to on-line tools, but also explaining acoustic notions and lots more.
http://www.engineeringtoolbox.com/Sound/SoundMain.htm

Steve Ekblad's Free Audio Software Page + On-Line Audio Tools
Includes some speaker related on-line calculators for speakers (port calculation) and a few simple other ones.
http://www.wssh.net/~wattsup/audio/

TROX Technik
This is probably the only gasflow (ventilation) attenuator program on the net. This program allows to calculate the attentuation of splitter and circular attenuators (disadvantage, it's based on standard Trox products, advantage the used absorption material is mineral wool, so the results can be used).)
http://www2.troxtechnik.de/auslegung/sd ... anguage=GB

References to calculate other tuned Helmholtz resonators
This are not calculation files, but files explaining how to calculate other than slatt type Helmholtz resonators.

Calculating the fundamental for a cubic Helmholtz
File uploaded by Jeff D. Szymanski (via Dan)
Helmholtz Cube.pdf

IPA Acoustics Handbook: How to use perforated steel sheet
This is a VERY GOOD publication of the Industrial Perforators Association (IPA), related to the use of perforted steel sheets, as wel for broadband absorption as well for tuned resonators.
http://www.iperf.org/ac00.htm

Different Calculation Tools on the StudioTips site itself
Several calculation tools originating from list members collected on the studiotips.com site. As well for MAC as well for PC.
http://www.studiotips.com/tools

Logs, Bels, Decibels, Adding & Subtracting Decibels
Not used to work with decibels? How to add or subtract them. Follow the instructions on this link and it will have no secrets for you anymore.
http://www.steve-o.com/public/unc/decibel/
Dan Nelson

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Joined: Sat Jan 31, 2004 2:52 am