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For those wishing to use multiple cabinets, the BV412RVB has caster cups on its top surface to accomodate the casters of a second cabinet, stacked on top.
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BV412RVB/SVB The Input/Output Plate: (1) Impedance Selector Switch: Use this switch to select 16 ohm mono operation or 8 ohm stereo/4 ohm mono operation. (2) Out 1/4” Jack: When using the cabinet in the mono operating mode, use this jack to connect the cabinet to another speaker enclo- sure of the same impedance.