![]() ![]() The clear winner is the folded horn design. The vibrating surfaces do give the sound more depth, but at the cost of rather high colouration and weaker volume. ![]() The design to the right does indeed work as planned, although it's no Stradivarius. It amplifies and directs the sound quite well, but the sound is still very tinny and flat. The traditional design in the middle sounds the worst. My listening tests revealed the following: To the right is a hollow design, with large plywood surfaces, the idea being that the surfaces will vibrate, thereby amplifying the sound and giving it more depth, almost like a violin or guitar. On the left is of course the folded horn, in the middle a solid plywood block where the sound is channelled from the phone's speaker through inside passages to two cone-shaped openings in front. The three designs I compared are shown in the picture. ![]()
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