I want to do the same. Add 2ohm Infinnity Kappa's
in lower fairing and J&M 7" Rockers in the fairing (2 ohm as well).
Can I wire them in series to make 4 ohms for the PBR300X4 amp?
If you take 2 2ohm speakers and wire them in series... + to -.. + from one speaker to amp and - from other speaker to amp, you will double the load to 4 ohms.