123tibbit

hi new to all this. I need advise a have a jcm800 4210 the one with 2 channels and 1x12 g12m-75 speaker.I would like to use a 1 x12 cab through the extra input it to make it a 2x12,but i would like to experiment with some different speakers.I,ve seen a few reviews of the tsl602 and people have changed the speakers for 1x12 g12 heritage and 1x12 vintage 30 both are 30 watts, would this be ok to try with my jcm? or would i need higher wattage speakers? 30 + 30 is 60 watts right? Any advise would be appreciated.