Front projectors are more expensive because they require better lamps. The front porjector requires far more light output because it is intended for screens up to 12 feet diagonal.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Front projectors are more expensive because they require better lamps. The front porjector requires far more light output because it is intended for screens up to 12 feet diagonal.