The all-tube Boogie® BASS 400+ was a modern-day classic used by the world’s most talented bassists for over two decades. From Paul McCartney to Mark King, Stanley Clark to Jack Blades and Michael Anthony, the 400+ crossed borders and musical genres to take center-stage behind true Icons during its 20-year build cycle. Today it’s our award-winning Subway® Series taking names with accurate Tone, warmth and portability in the Class D realm. The evolutionary step forward beckons to combine these two distinctive preamps and create a powerful, portable way to feature their unique personalities in one package. The Subway® TT-800™ answers that call!