Fender Rumble 25 Bass Combo (V3) Part of Fender’s recent update to the ever-popular, and very portable, Rumble Series, the Fender Rumble 25 V3 Bass Guitar Combo Amplifier is the next step up from the smallest of the series. Armed with a beefier 25-watts of power and a larger, ported 10” speaker, the Rumble 25 provides greater volume and a deeper bass response than its smaller sibling. The Fender Rumble 25 Bass Guitar Amp’s simple, yet powerful sound-sculpting options keeps you covered, with volume and 3-band EQ (consisting of Bass, Mid & Treble) sitting alongside a switchable Contour control, which, with the newly-developed overdrive circuit, offers gritty bite and heavy punch. The new Rumble series are based on the amazing Genz-Benz range of bass amps, which they now effectively replace.