With 150 watts of sheer bass power behind it, the MB150 houses a 1 x 15" speaker that can only mean one thing - you mean business! This combo in the series offers the tone and versatility required by any professional bass player. Yet again, the combo has two channels (Modern and Classic) with separate EQ for each. The Modern channel features Bass, Treble, parametric Mid and a switchable compressor with variable level control. The Classic channel with its ECC83 pre-amp valve includes a Boost switch and has a 3-band passive tone network featuring a mid Voice control with three modes.