Orange OB1-500 Bass Amp Head FEATURES: RACK MOUNTABLE (2U) BI-AMP' INSPIRED BASS HEAD WITH FOOTSWITCHABLE GAIN & BLEND CONTROLS, ACTIVE 3 BAND EQ, BALANCED DI & LINE LEVEL OUTPUTS FRONT PANEL (RIGHT TO LEFT): INSTRUMENT INPUT WITH ACTIVE/PASSIVE SWITCH, GAIN, BLEND, BASS, MIDDLE, TREBLE, VOLUME, FOOTSWITCH INPUT, MAINS SWITCH REAR PANEL (RIGHT TO LEFT): SPEAKER OUTPUTS (SPEAKON), 1/4 LINE OUTPUT, BALANCED OUTPUT WITH GROUND LIFT SWITCH SPEAKER OUTPUT OPTIONS: MINIMUM 4 OHM: 1 X 8 OHM, 2 X 8 OHM, 1 X 4 OHM OUTPUT POWER: 500 WATTS, CLASS A/B