Here is a used GT (Groove Tubes) Electronics Speaker Emulator II rack mount signal processor. This particular example is in very excellent all original condition and includes the original manual! The GT Speaker Emulator II essentially provides the guitarist with vintage tone while connecting straight into a PA system, bypassing the need for speakers altogether. This allows for amazing tone, and perfectly balanced stage volume. Based off the Celestion G12, the SE II not only emulates this speaker perfectly, but also includes a bypassable EQ section to further dial in that perfect tone. Whether in the studio or playing live, this is the best investment for any player.