Stepper motor in series power in one bu CNC shield

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I need 3.78 volts to through stepper motor, but my stepper motor has limit volt is 2.7 V

Quick Wantai 42BYGHM809 stepper motor specification:

  • Voltage rating: 2.7 V
  • Current rating: 1.68 A
  • Resistance: 1.6 Ω per coil

I have 24v 6.5A power supply.

I need 5.4V for two stepper motors in series in each X and Y

I checked internet to help me to adjust reference voltage for stepper motor, they doing VREF for single stepper motor but what about two stepper motor?

Check link here: https://cobcnc.com/adding-a-cnc-shield-and-tuning-drv8825-drivers/