From the product page at the link supplied:
This has about 3-4 times more motor power than entry-level controllers like the gShield.
Could you give a little more information as to how this was determined?
Four amps per phase is not 3 to 4 times 2.5 amps per phase. P = V * I with both running at 24 volts I don't see how you came up with this number.
Also, if you have four motors with 4 amps per phase that would be 8 phases needing 32 amps. A 400 watt power supply can only deliver 16 amps at 24 volts.
The numbers don't seem to add up.
Thanks for any info you can provide......