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This design is very simple to make and also made out of hard material which will be very helpful in the sound amplification process. The two cups are the speakers which the sound will essentially come out through

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Interaction between the device and external speaker

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Interaction between the device and external speaker

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The sound waves emitted from the phone will be diverted through both sides coming out of the hole in the paper cups

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This design is easy to use and looks attractive but its made out of wood and it would be a challenge to forge the cardboard into the shape without it becoming weak and fragile which in tun would reduce the sound amplification. A really good element of this design is the phone holder because it is universal and

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This is a good deign because its uses recyclable materials and is easy to make and use which will make it more attractive.

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Apple iPhone (ANY)
Samsung Galaxy (ANY)
Microsoft Phone (ANY)

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Phone holder should also be secure in the speaker so consumers are able to move around with their phone without having to worry about dropping it. This is also important because we don't want the phone moving around too much, since it would divert the sound waves causing it to be absorbed  by objects in the surrounding environment

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Universal phone holder is a good choice, because it would enable anyone is able to use this product. Also this is beneficial so we can position the phone. In a way that the sound waves travel in the desired direction in turn reducing the amount of absorption

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-Multiple layers of compressed Cardboard so the sound can easily bump into the particles which will produce greater sound
-A base plate of glass since sound travels fastest in glass at 4540m/s
-Aluminium foil since sound waves travel approximately at 5000m\s
-Sticky tape, super glue so we can make sure there are no little open spaces inside the amplifier and so we can hold the different components together
-Paper cup since we need it as the speakers of the amplifier which the sound waves will come out through
-Cylinder so the sound waves can be directed in both directions and because sound waves travel fast in hard material as the atoms are all bunched up together

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Should be of a moderate size. This will make it portable which will attract a wide range of consumers. As well as  reduce the amount of sound waves that would normally be absorbed by the amplifier.

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Make sure it is made out of a good hard material from which sound can bounce off easily with minimum absorption