Room Resonances
FREE CALCULATOR
The Room Resonances Calculator (RRC) will calculate every room resonance along every axis in your cinema. It also calculates the polarity locations for the 1st to 4th resonances, critical information needed when using multiple subwoofers to optimise bass response.
Do you need to know the resonance frequencies, the location of resonance peaks and dips, or are you optimising a multi-subwoofer system? RRC does it all.
This calculator is provided entirely free of charge, with no credit card required.
The calculator provides a PDF file upon completion.
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Instructions for Data Entry
In order to create the report, the Room Resonances Calculator needs some information about the project. Cinema Tools does not store or record any data that is entered into this form.
Project Name:
Enter the project name so that the report can be easily identified
Prepared By:
Enter the name of the person creating the report
Calculation Units:
Select the measurement units that will be used in the other form fields
Length:
Enter the length of the room using the units selected for this calculator
Width:
Enter the width of the room using the units selected for this calculator
Height:
Enter the height of the room using the units selected for this calculator
Resonance Distribution
The Room Resonances Resonance Distribution page of the report is used to show all of the resonances calculated for the given room size.
The calculator also runs a check on the resonance distribution using the Walker Criteria formula which helps to identify if the distribution of the length, width and height resonances are well separated or if they interact with each other.
The right hand data bar details:
- Project Name
- Room Length in the units selected for the calculator
- Room Width in the units selected for the calculator
- Room Height in the units selected for the calculator
- Pass or Fail of the Walker Criteria calculations
- Colour Key to identify each of the calculated room resonance categories
Axial Resonance 1
The Room Resonances: Axial Resonance 1 page of the report is used to show the frequency and spatial distribution of the first resonance.
An axial resonance is one which forms between two surfaces within the room – specifically along the length the width or the height of the room.
The first result on this page shows the Top View of the room with the bottom left corner being location 0,0. This means the front wall is on the left of the top view. Length dimensions are marked along the lower side of the view and width dimensions are marked along the right side of the view.
The second result on this page shows the Side View of the room. The front wall on the left of the side view. Length dimensions are marked along the lower side of the view and height dimensions are marked along the right side of the view.
The solid lines on the drawing indicate where the resonance has a pressure peak.
For Axial Resonance 1 those are found at the perimeter of the room.
The dashed lines on the drawing indicate where the resonance has a pressure Null.
For Axial Resonance 1 those are found at the mid lines of the room.
The polarity indicators show how a subwoofer placed in one section will interact with a subwoofer placed in another section. The polarity changes at at each null crossing point.
The right hand data bar details:
- Project Name
- Room Length in the units selected for the calculator
- Room Width in the units selected for the calculator
- Room Height in the units selected for the calculator
- Frequency Data for Axial Resonance 1
- Resonance Frequency Length in Hz
- Resonance Frequency Width in Hz
- Resonance Frequency Height in Hz
- Colour Key to identify each of the elements on the room views
Axial Resonance 2
The Room Resonances: Axial Resonance 2 page of the report is used to show the frequency and spatial distribution of the second resonance.
An axial resonance is one which forms between two surfaces within the room – specifically along the length the width or the height of the room.
The first result on this page shows the Top View of the room with the bottom left corner being location 0,0. This means the front wall is on the left of the top view. Length dimensions are marked along the lower side of the view and width dimensions are marked along the right side of the view.
The second result on this page shows the Side View of the room. The front wall on the left of the side view. Length dimensions are marked along the lower side of the view and height dimensions are marked along the right side of the view.
The solid lines on the drawing indicate where the resonance has a pressure peak.
For Axial Resonance 2 those are found at the perimeter and mid lines of the room.
The dashed lines on the drawing indicate where the resonance has a pressure Null.
For Axial Resonance 2 those are found at the quarter lines of the room.
The polarity indicators show how a subwoofer placed in one section will interact with a subwoofer placed in another section. The polarity changes at at each null crossing point.
The right hand data bar details:
- Project Name
- Room Length in the units selected for the calculator
- Room Width in the units selected for the calculator
- Room Height in the units selected for the calculator
- Frequency Data for Axial Resonance 2
- Resonance Frequency Length in Hz
- Resonance Frequency Width in Hz
- Resonance Frequency Height in Hz
- Colour Key to identify each of the elements on the room views
Axial Resonance 3
The Room Resonances: Axial Resonance 3 page of the report is used to show the frequency and spatial distribution of the third resonance.
An axial resonance is one which forms between two surfaces within the room – specifically along the length the width or the height of the room.
The first result on this page shows the Top View of the room with the bottom left corner being location 0,0. This means the front wall is on the left of the top view. Length dimensions are marked along the lower side of the view and width dimensions are marked along the right side of the view.
The second result on this page shows the Side View of the room. The front wall on the left of the side view. Length
dimensions are marked along the lower side of the view and height dimensions are marked along the right side of the view.
The solid lines on the drawing indicate where the resonance has a pressure peak.
For Axial Resoance 3 those are found at the perimter and third lines of the room.
The dashed lines on the drawing indicate where the resonance has a pressure Null.
For Axial Resoance 3 those are found at the sixth lines of the room.
The polarity indicators show how a subwoofer placed in one section will interact with a subwoofer placed in another section. The polarity changes at at each null crossing point.
The right hand data bar details:
- Project Name
- Room Length in the units selected for the calculator
- Room Width in the units selected for the calculator
- Room Height in the units selected for the calculator
- Frequency Data for Axial Resonance 3
- Resoance Frequency Length in Hz
- Resoance Frequency Width in Hz
- Resoance Frequency Height in Hz
- Colour Key to identify each of the elements on the room views
Axial Resonance 4
The Room Resonances: Axial Resonance 4 page of the report is used to show the frequency and spatial distribution of the third resonance.
An axial resonance is one which forms between two surfaces within the room – specifically along the length the width or the height of the room.
The first result on this page shows the Top View of the room with the bottom left corner being location 0,0. This means the front wall is on the left of the top view. Length dimensions are marked along the lower side of the view and width dimensions are marked along the right side of the view.
The second result on this page shows the Side View of the room. The front wall on the left of the side view. Length dimensions are marked along the lower side of the view and height dimensions are marked along the right side of the view.
The solid lines on the drawing indicate where the resonance has a pressure peak.
For Axial Resonance 4 those are found at the perimeter, mid and quarter lines of the room.
The dashed lines on the drawing indicate where the resonance has a pressure Null.
For Axial Resonance 4 those are found at the eighth lines of the room.
The polarity indicators show how a subwoofer placed in one section will interact with a subwoofer placed in another section. The polarity changes at at each null crossing point.
The right hand data bar details:
- Project Name
- Room Length in the units selected for the calculator
- Room Width in the units selected for the calculator
- Room Height in the units selected for the calculator
- Frequency Data for Axial Resonance 4
- Resoance Frequency Length in Hz
- Resoance Frequency Width in Hz
- Resoance Frequency Height in Hz
- Colour Key to identify each of the elements on the room views