Where can I get the manual for the Rumble LT amplifier? You can view and download the manual right here! Related articles Where can I get a copy of the Rumble LT Quick Start Guide? Where can I get the manual for the Mustang LT amplifier? How do I update the firmware on my Mustang LT or Rumble LT? How to update the firmware on a Mustang GTX, GT or Rumble amplifier About Mustang LT & Rumble LT Amplifiers