adding 4 ohm cab to an 8 ohm
 

Hi i currently have a SWR 350x with a kustom 410 and kustom 115 . dont think the 115 is cutting it so i was thinking of getting the fender rumble 410 which is 4 ohms so the rig would be running at 2.67 ohms i believe.. anyone have experience with this set up or experience with getting more out of a 350x

Specs say it will handle a 2 ohm load!

Understand, that the power between the 2 cabs will be uneven. The 4 ohm 410 will get 2/3, while the 8 ohm gets 1/3. Not ideal. Much better to wait and find an 8 ohm cab, so both get equal power.