In 2003, Rockport Technologies introduced the Sheritan II bass modules as an adjunct to the Merak II. Each unit featured a 12 inch sandwich composite cone Eton woofer, and the addition of the Sheritan II bass modules to the Merak II resulted in a serious, full range loudspeaker with enormous dynamic capability. This modular approach allowed the owner to purchase the Merak II as a stand-alone two-way, and then upgrade to the Merak II/Sheritan II combination at a later date.