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Genz Benz bass amplifiers

Depends on what's loaded in the Contour combo. So long as adding a cab doesn't dip below the amps minimum impedance, you're fine. Best to get an ext cab that closely matches what's in the combo, ie: 1x12 combo/1x12 ext cab, or 2x10 combo/ 2x10 ext cab, etc.
 
Total load below 4 ohms is not good. That would be 2 x 8 ohm cabinets in parallel.

If using 2 cabinets, each one should be 8 ohms or GREATER (not less).
 

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