In the world of high-performance bass amps, Ampeg's SVT amplifiers are in a class by themselves. In true Ampeg tradition, the SVT-4 PRO offers you more power, performance and flexibility than any other bass amplifier in its class. SVT-4PRO offers an expansive palette of tonal options. The Frequency control allows you to select the centre frequency for the Midrange control, giving you five distinct voicing options for the Midrange. And if that's not enough, you can use the 9-band graphic EQ to fine-tune your sound - or use it to set up a foot switchable "second channel" with a volume boost for your bass solo. SVT-4PRO is designed for the player who wants SVT tone and performance (with a few modern enhancements) in a convenient, high-powered, rackmount design. 1200W, tube preamp and stereo power amp.