Expanding on their Groove Bass amp line which was introduced in 2004, Kustom Amplification unveils three, Groove Bass combo amplifiers at Winter NAMM 2005. The new Groove Bass 115C features one 15-inch Eminence speaker, a compression horn with its own Level control and 600 watts of output power as a self-contained unit; external speaker cabinets are not required to utilize all 600 watts. The Groove Bass 210C offers the same 600-watt circuit, but with two, 10-inch Eminence speakers. And last but not least, the Groove Bass 310C provides three 10-inch Eminence speakers with 1,200-watt output power. Again, this is 1,200 watts as the amp is wired; additional speaker cabinets are not necessary to attain full power.