For years, bassists have been combining guitar and bass amps to remarkable effect, adding harmonics and layers of overdrive from a guitar amp to their core bass tone in pursuit of the ultimate live sound. This “bi-amp” trend got the engineers at Orange Amplification thinking: why drag two amps to the show when you could take just one? The result is the OB1 series of Class A/B rack mountable bass heads, which take care of this and much more besides. SPECS: Brand: Orange Model: Orange Amps OB1-500 Bass Amplifier Head Finish: White powder-coated steel chassis (2U 19" Rack Mountable) Made In: United States of America Color: White 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: Instrument Input with Active/Passive Switch, Gain, Blend, Bass, Middle, Treble, Volume, Footswitch Input, Mains Switch Back Panel: 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 Dimensions: 48.2 × 26.5 x 10cm (18.97 x 10.43 x 3.93″) Weight: 10.1kg (22.26lb) Serial Number: R-03B774