But a
surface can also have a strong effect on a semiconductor, and as porous silicon has an enormous
surface area — between 200 and 1000
square metres for each cubic
centimetre of the material — many researchers believe a second theory: that the
surface is responsible for efficient luminescence.
In the Panamera, the Burmester system not only includes multiple amps et al, but features 16 speakers covering (according to Porsche) a «never before» installed 2400
square centimetres of «acoustically effective
surface».