Electro Magnet - EM

The performance of a loudspeaker is directly linked to the magnetic energy transmitted by the magnet - a subject that Focal knows well, having invented original and technically advanced solutions such as the Multiferrite magnet, which remains one of the brand's technological signatures. But permanent magnets are power-limited, and in the context of a reference woofer, this is a real problem. Because a woofer should combine at least two essential performances: high efficiency and the ability to go down in frequency. To get down to low frequencies, you can play with the flexibility of the surround and spider, but above all you need to increase the mass of the cone. If you increase the mass, the efficiency drops. And to compensate for this drop, you need to increase the motor's power. This is where the limits of the permanent magnet come into play, forcing a compromise between efficiency and resonant frequency.