Rumble™ LT25 Rumble LT25 incorporates what we’ve learned over decades of producing the best-sounding bass amps on the planet. It’s ideal for any bassist who wants a great-sounding, easy-to-use amp with a super-simple user interface. A collection of 50 presets covers a wide range of music—a “greatest hits” of electric bass tones. The versatile signal chain with high-quality onboard amp and effects models produces amazing tones, making it an ideal practice amp for home or office.