DS Audio DS-W1 Optical Cartridge

From Japanese DS AUDIO an unconventional system that uses an optical pickup, but in a unique way.
DS Audio's system, infact, uses a conventional stylus and cantilever but gets rid of the magnet and coil to prevent the 'electromagnetic friction force'.

DS Audio DS-W1 optical cartidge uses a conventional stylus, but with an optical system tracking the movement of the stylus cantilever rather than having a magnet or coil mounted on its end. This pickup works in proportion to the position of the cantilever (and thus the stylus) rather than its velocity, eliminating one stage of EQ.
This unique cartridge comes with its own system to provide power, RIAA EQ and pre-amplification, but is installed on the user's preferred tone arm.