Fender Rumble 15 Cabinet - The all-new Rumble Series is a mighty leap forward in the evolution of portable bass amps. Rumble Series speaker cabinets have been re-voiced to produce a superior level of sonic detail and low-frequency translation. And for even greater performance and convenience, all Rumble cabinets are equipped with Fender's patented Magnetic Rumble Head-Attachment System. Additional upgrades include Eminence drivers and premium HF compression tweeters.