The OB1-300 is a 300 watt solid state bass amp with a some simple features that lead to a variety of tones. There is a 3-band EQ, active and passive inputs, and a DI out. The main feature is the ability to blend in the foot switchable overdrive channel. Rather than switching channels, this amp allows you to overdrive one channel and then blend the two together, creating a huge array of tonal choices.