For projects in Ethiopia
Auditorium acoustics and soundproofing in Ethiopia
A large hard volume where speech falls apart long before anyone calls the room echoey. The target is intelligibility at the back row, which is a reverberation and early reflection problem, not a loudspeaker problem. Church buildings and conference halls are tall hard volumes with long reverberation.
- Reverberation time
- Set against use. Speech and music want different numbers, and a dual use hall needs a decision.
- Early reflections
- Shaped surfaces that send energy to the rear seats rather than absorbing everything.
- Rear wall
- The single worst surface in most halls, and the first one to treat.
- Quote
- From a plan and a section, within 48 hours
01 / The product
What this is, and what it changes in a Ethiopia room
A large hard volume where speech falls apart long before anyone calls the room echoey. The target is intelligibility at the back row, which is a reverberation and early reflection problem, not a loudspeaker problem.
Church buildings and conference halls are tall hard volumes with long reverberation.
Work reaching us from Ethiopia is mostly industrial parks, offices, hotels, places of assembly, schools, hospitals.
- Landlocked, so the road leg counts Djibouti then several hundred kilometres by road. We quote the sea leg and the road leg separately so the date is honest.
- Packing has to survive the run A long road leg on mixed surfaces is hard on a pallet. We brace and wrap for that rather than for a short port transfer.
- Industrial parks at scale New manufacturing built quickly, where enclosure and partition detail can still be designed in rather than retrofitted.
- Reverberation time Set against use. Speech and music want different numbers, and a dual use hall needs a decision.
Full specification
Thickness, density, NRC by frequency, fire class, standard sizes and build-up detail for auditorium acoustics are on the main product page. This page covers what that means for a project in Ethiopia.
02 / The build-up
The build-up, layer by layer
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Layer 1
Wooden slat acoustic panels
Timber slats on an acoustic backing. In Ethiopia, split units and generator sets, with mechanical plant close to occupied areas.
Feature wall only. Slats where they are seen, plain felt elsewhere, to hold the budget where it shows.
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Layer 2
PET felt acoustic panels
A rigid non-woven panel pressed from 100% polyester fibre, a large part of it recycled. In Ethiopia, church buildings and conference halls are tall hard volumes with long reverberation.
On a 25 to 50 mm air gap. The same panel on battens. The air gap moves absorption down in frequency at no extra material cost, and is the cheapest improvement available.
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Layer 3
Ceiling baffles and clouds
PET felt suspended from the soffit, vertically as baffles or horizontally as clouds. In Ethiopia, classrooms are concrete and hard surfaced with large class sizes and long corridors.
Vertical baffles. Hung on edge in rows. Both faces absorb, so coverage figures based on plan area understate them.
If you are specifying for a Ethiopia project, we can give you a section, a BOQ and the honest limits of each layer. See how we support architects.
03 / On the ground
What decides the build-up in Ethiopia
- Landlocked, so the road leg counts
Djibouti then several hundred kilometres by road. We quote the sea leg and the road leg separately so the date is honest.
- Packing has to survive the run
A long road leg on mixed surfaces is hard on a pallet. We brace and wrap for that rather than for a short port transfer.
- Industrial parks at scale
New manufacturing built quickly, where enclosure and partition detail can still be designed in rather than retrofitted.
- Large assembly spaces
Halls and civic spaces built in concrete where speech fails long before the room is called echoey.
- Assembly and performance rooms
Church buildings and conference halls are tall hard volumes with long reverberation.
- School and campus buildings
Classrooms are concrete and hard surfaced with large class sizes and long corridors.
04 / Room by room
Room by room, on a typical Ethiopia job
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Reverberation time
Set against use. Speech and music want different numbers, and a dual use hall needs a decision. Djibouti then several hundred kilometres by road. We quote the sea leg and the road leg separately so the date is honest.
- PET felt acoustic panels, 100% PET non-woven, no added binder
- Ceiling baffles and clouds, 9 to 24 mm
- Acoustic carpet and rugs, High density polyester
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Early reflections
Shaped surfaces that send energy to the rear seats rather than absorbing everything. A long road leg on mixed surfaces is hard on a pallet. We brace and wrap for that rather than for a short port transfer.
- PET felt acoustic panels, 9, 12, 18 and 24 mm standard, tolerance plus or minus 5 percent
- Ceiling baffles and clouds, Made to the drawing, standard and custom
- Acoustic carpet and rugs, Felt
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Rear wall
The single worst surface in most halls, and the first one to treat. New manufacturing built quickly, where enclosure and partition detail can still be designed in rather than retrofitted.
- PET felt acoustic panels, 4 to 24 mm
- Ceiling baffles and clouds, Both faces work, which is why suspended area outperforms the same area laid flat
- Acoustic carpet and rugs, 64 sq ft per pack
If the visual is fixed and the room still has to perform, that is a solvable problem and a conversation worth having early. See how we work with interior designers.
04 / Conditions
The Ethiopia climate decides the material list
Ethiopia is warm and humid through most of the year, with a long wet season, and that narrows the material list before acoustics is discussed.
Humidity is the deciding factor. PET felt does not absorb moisture, shed fibre or feed mould, which is why it outlasts fabric-wrapped mineral wool in this climate. Wood wool and timber need a ventilated cavity behind them.
The failure we design against here is mould, sagging fabric finishes and swelling in timber.
If a consultant has set the target, we will quote against their figures rather than ours, and stay out of the scope they own. More on working with acoustic consultants.
06 / Straight talk
Six mistakes that turn into a second fit-out
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Absorbing the whole room and losing the back rows
It sounds like a small detail until the room is finished and the complaint arrives.
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Adding speakers to fix a reverberation problem
It sounds like a small detail until the room is finished and the complaint arrives.
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Ignoring the rear wall because it is behind the audience
It sounds like a small detail until the room is finished and the complaint arrives.
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Treating it as a generic Ethiopia job
Djibouti then several hundred kilometres by road. We quote the sea leg and the road leg separately so the date is honest.
05 / Supply
How material reaches a Ethiopia site
| Ships from | Palwal, Haryana, India |
|---|---|
| Arrives at | Djibouti, then road inland to Addis Ababa |
| Dispatch | 4 to 7 working days |
| Freight | Sea via Djibouti, then road |
| Support | Drawings, build-ups, BOQ and material that arrives complete |
Standard items dispatch in 4 to 7 working days. Grooved panels and custom colours take longer, and we say so before you order, not after.
Sea freight into Djibouti, then road inland to Addis Ababa and beyond. Air freight for samples and urgent quantities.
Questions from Ethiopia projects
What makes auditorium acoustics and soundproofing different in Ethiopia?
Church buildings and conference halls are tall hard volumes with long reverberation. Djibouti then several hundred kilometres by road. We quote the sea leg and the road leg separately so the date is honest.
Where should the budget go first on a Ethiopia project?
Reverberation time. Set against use. Speech and music want different numbers, and a dual use hall needs a decision. Early reflections. Shaped surfaces that send energy to the rear seats rather than absorbing everything.
Do you have an office or installation team in Ethiopia?
No. We manufacture in India and supply into Ethiopia. We give you drawings, build-ups, a BOQ and material that arrives complete, and we will tell you plainly when a job needs a local contractor we cannot be.
How does material get to a Ethiopia site?
ships from: Palwal, Haryana, India, arrives at: Djibouti, then road inland to Addis Ababa, dispatch: 4 to 7 working days. Standard items dispatch in 4 to 7 working days. Grooved panels and custom colours take longer, and we say so before you order, not after.
What goes wrong most often on this kind of project?
Absorbing the whole room and losing the back rows. Adding speakers to fix a reverberation problem.
What do you need from us to quote?
A plan, a section through the critical partition or ceiling, and what the room is for. From that we can give a build-up and a BOQ rather than a price per square foot.
Next step
Send a plan and a section, get a real build-up
A plan and a section is enough. We will come back with a build-up, a BOQ and a delivered date, and we will say so if what you are asking for will not work.