The woofers are from the same company than the ones in the "normal" S-range. They are from the "Symphony Line" of german manufacturer ETON:
ETON Car-HiFi Home-HiFi loudspeaker Lautsprecher Boxen Audio HiFi ETON LPG etongmbh Subwoofer tweeter bass radio
Nevertheless, the SX range looks really good, and due to some design-changes will be very different to the S-Range, expecially S3X-H to S3A.