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Room Boundaries and Modal Issues
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January 31, 2021
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February 1, 2021 - 11:49 am
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I am new to these forums and so forgive me if I have started off posting under the wrong sub forum. Room mode calculators use the internal room dimensions to calculate potential issues. Do these calculators assume 100% reflection of the bass back into the room, because that doesn't really happen does it? Bass passes through sheetrock and the wall cavity where some is mitigated. After all this how the built in diaphragmatic bass traps work, isn't it?. The reflection point back into the room would actually be at the boundary of the brick outer wall of a brick home, wouldn't it? If that is the case, that could add close to another foot to the actual room dimensions used to to make those calculations.

Windows would be another issue allowing the bass to leave and not reflect back in at all. I guess they could be considered a type of infinite bass trap. With new construction would it be possible to build in a similar type of trap without the use of windows? Your techniques like to make use of the wall cavities between studs to create bass mitigation. Would it make sense to build a false wall designed to allow the bass to pass through and get mitigated in a space between that wall and the actual room boundary wall? That space could be several feet wide allowing for other creative solutions for keeping most of the bass from reflecting back into that room.

Dave

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Chief Acoustics Engineer
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August 12, 2013
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February 1, 2021 - 2:02 pm
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Low-frequency energy is wave energy. It is a pressure based energy that fills the room. Reflection does not apply to low-frequency pressure. Diaphragmatic absorption is a pressure based technology. It reacts to the pressures exerted upon it. Some energy is absorbed some is not. Standard windows are the perfect low frequency absorber . Sound leaves and never comes back. Building walls to absorb energy is done through our CAW system: https://www.acousticfields.com.....rber-wall/

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