How can I wire 1 dvc 4 ohm sub and 1dvc 2 ohm sub together to a mono amp

[modrat468]

Car subwoofer wiring

 

[Rocky Bennett]

https://jlaudio.zendesk.com/hc/en-us/articles/204374200-Dual-Voice-Coil-DVC-Wiring-Tutorial

 

[americanaudiophile]

Great info in the link above.
You don't actually have to use both voice coils with a mono amp unless you need to lower the impedance to maximize the power output of the amp or raise the impedance up to the minimum the amp can handle,