AKRON AS40 This is the product we sell most in our line. It offers the best cost/benefit relation among planar transducers of high fidelity. It is a leaf system that consists of a slim diaphragm, immerse in a powerful magnetic field. With a minimum inertia due to the low weight, it offers an invincible response to transients, which provides realism in the reproduction, making it similar to a live performance. The AKRON AS 40 panels have a frequency response between 200Hz and 18Khz.