Good Signal level and Bad Signal level

Hi

I have an AP with RB911G-5HPnD with 25 connected CPE (all SXT Lite 5 and one Dynadish 5)
Signal levels of connected CPE varies between -46/-49 (Best Signal level) to -72/-76 (Worst Case)

I need to know does this variation of signal level effect the AP wireless cards ?

Thank you