Spider IV guitar amps redefine what is sonically possible from modeling amplifiers. Each one delivers an inspiring collection of amp models, extraordinary effects and a truly evolved playing experience. The Spider IV family includes five combos (15-watt 1x8, 30-watt 1x12, 75-watt 1x12, 120-watt 2x10, and 150-watt 1x12) and a 150-watt head. Quick Loop is a really exciting new feature of Spider IV 75, 120, 150 and HD150. It's a 14-second looper that can be used in a number of cool ways. Manual mode (available in Spider IV 75, 120, 150 and HD150) is for players who desire a more traditional amplifier experience. In manual mode, choosing an amp model does not dictate the settings of the other front-panel knobs.