From the express assembly manual:
Power Information
Using both power inputs (ie: two cords on two separate circuits (ie: breakers))
40 amps Total for the Express with approved heat sink attached
4 amps per channel maximum with approved heat sink attached
2 amps per channel maximum without approved heat sink attached
Using one power input (see below - Appendix A single power input mod)
20 amps Total for the Express with approved heat sink attached
4 amps per channel maximum with approved heat sink attached
2 amps per channel maximum without approved heat sink attached
There is also a limit of 20 amps per half (1-8 or 9-16) and this assumes you have a 20 amp dedicated circuit for each half with appropriate power leads coming into the box (12 gauge or bigger). If I remember correctly, a 16 gauge (awg) cable tops out at about 13 amps - more than that creates a fire hazard.
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