Recent content by Dennis Foley
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Would Acoustic Foam On The Ceiling Help My Room?
Here is a video I did showing the criteria for a diffused sound field.- Dennis Foley
- Post #22
- Forum: Acoustics and Room EQ Forum
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Is a very big listening room as bad as a very small one?
The size/volume/usage of your room will either exaggerate or minimize the issues the room produces. Rooms only see energy. The source of the energy is not relevant. Large amounts of energy will excite large amounts of issues. All small rooms produce unwanted low-frequency energy issues. Begin...- Dennis Foley
- Post #48
- Forum: Room Acoustics Forum
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Would Acoustic Foam On The Ceiling Help My Room?
Open celled acoustic foam will assist you with reverberation time issues. Make sure you use a foam technology that is specifically designed for music and voice. Do not use diffusion until you have your reverberation times within the room managed correctly. Diffusion will make your room sound...- Dennis Foley
- Post #20
- Forum: Acoustics and Room EQ Forum
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Solving acoustics on a 17' x 13'8"x 10' room for two channel
In small room acoustics, you must treat the low frequency issues first and foremost. The fundamental low frequency issues produce harmonics that extend through the middle and higher range frequencies. If you treat the fundamentals, you minimize the impact at the middle and high frequencies. In a...- Dennis Foley
- Post #19
- Forum: Acoustics and Room EQ Forum
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Corner Bass Traps - Always beneficial?
You have two types of "energy" within your room. You have wave energy which is energy below 100 Hz. You have ray energy which is energy above 100 Hz. Wave energy is pressure based. You must use a pressure based technology in order to adequately treat wave pressure issues. Ray energy which is...- Dennis Foley
- Post #338
- Forum: Room Acoustics Forum
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Corner Bass Traps - Always beneficial?
The corners of a room are not the issue. It is the complete wall surface area. By definition, axial modes are produced by two parallel surfaces not two parallel corners. A corner represents only a fraction of the surface area of the total wall.- Dennis Foley
- Post #336
- Forum: Room Acoustics Forum
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Is a very big listening room as bad as a very small one?
Each room size/volume/usage will have its own set of issues. If the room is small with full range usage, you will have numerous unwanted pressure issues below 100 Hz. If the room is larger, you will have to deal with reflections from boundary surfaces that increase Rt-30/60 times. There is no...- Dennis Foley
- Post #47
- Forum: Room Acoustics Forum
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New idea for Bass mode treatment
Do not confuse middle and high-frequency reflections with low-frequency pressure waves. Waves and ray energy are completely different in form and treatment requirements. Low-frequency energy is pressure based while middle and high-frequency energy is based upon air movement across a surface area.- Dennis Foley
- Post #22
- Forum: Acoustics and Room EQ Forum
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Bass Trap and general room treatment advice please
Steve, Do not get caught up in the myth that a limp mass material such as building insulation will absorb enough energy to attenuate 30 - 100 Hz. You need to choose a technology that can attenuate energy at those frequencies since based upon your room dimensions, you will be faced with large...- Dennis Foley
- Post #22
- Forum: Room Acoustics Forum
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methodology and approach for subs and bass traps
L, Unfortunately, the building insulation material type, amount, and thickness will not address your low-frequency issues at all. It's only sonically viable for low mids and up and it over absorbs at every octave. You can achieve good attack and decay rates for your low-end but you must be...- Dennis Foley
- Post #18
- Forum: Acoustics and Room EQ Forum
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