A low bandwidth signal does not have more power.

no,because generally the lower frequency side existed for lower bandwidth,and higher frequency side existed higher bandwidth,so thus we can say that lower bandwidth has generally has lower power as compared to higher bandwidth.

SSBSC uses 1/2 of the bandwidth and 1/6 as much RF power as AM modulated 100% .

everyone,

As far as I know the Full power bandwidth is the output bandwidth of the signal when it is made to obtain the max power from output

suppose max output voltage is +/- 10 V as prescribed in the data sheet and the slew rate is 600V/u sec , then the full power bandwidth will be

600/(2*pi*10) that is 9.548 MHz

Its bandwidth is determined by the narrowest one within any stage. E.g. If the preamp's is 5MHz and the power amp is 500kHz, then the total bandwidth of the system will be 500kHz.