Blackstar Series One 2x12 Tube ComboBy switching both preamplifier and power amplifier parameters the Series One 45W delivers both Class A style tones with a bell like ring and classic push pull crunch depending on the mode selected. The patented ISF control removes the limitations of traditional designs allowing you to tune the tone to exactly the sound you are looking for. DPR can reduce the power down to 4. 5W and MIDI switching and a series effects loop make this the ultimate pro's