The OBL-2 allows standard Hammond consoles to be connected via a 1/4" output jack to an external amplification system. Mounts under the generator shelf or other convenient location. The unit has both an overall output and one that is low pass filtered. The low pass output is useful when using a bass amp to reinforce the organ low end. A level control is provided to allow the output signal to be adjusted to match the amplifier input requirements. For those circumstances where connecting to an external amplifier is desirable. These include temporary installations, rental instruments, and adding a bass amp to give the organ more low end power.

NOTE: Pre-amps in early console models (A,AB,AV,B, BA,BC,BCV,BV,C,CV,D,DV,and G) receive their DC operating voltage from the tone cabinet and will not produce an output if  the tone cabinet is disconnected.