Right it is mono. Classe tells you how to wire the amp to run the amp mono. Fine. You can run two sets of wires to the sub, but it won't matter, because the sub will sum them anyway. Because: mono. So run one set from the amp to either L or R on the sub. Won't matter which because: mono. Summed either way.
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Knowing the age of this passive sub and the configuration of connections on the back, I was thinking the 12" driver might have a dual voice coil. This video confirms that.
A mono connection will only power half of the driver's voice coil, and connecting both inputs of the sub to the amp in mono mode will create an impedance problem for the amp. It will be best to connect the amp in stereo mode to both inputs on the sub.