Can I connect a DC power supply to Line 6 Micro Spider with AC "port"?

@amelio -

          Your amp only has one power supply port, designed to take the OUTPUT* plug of a wall wart AC/DC converter (ie: the PX-2g).

           The, "AC IN" labeling is an error and the company should made aware of THEIR confusion (AS IF they care, over there).

                                         *AC in / DC out, of course.

How about the owner manual. Is it misprinted as well?

PX-2 Power Supply Input
Only use a Line 6 PX-2 power supply
when powering your Micro Spider using
the AC IN connection.

"AC in connection."

I have no idea if the circuitry inside the amp can be fed with DC as well.

.

Your amp only has one power supply port, designed to take the OUTPUT* plug of a wall wart AC/DC converter (ie: the PX-2g).

jea48 is correct! The PX-2G is a transformer step down 120VAC to 9VAC, it's not a wall wart AC/DC converter.

The, "AC IN" labeling is an error and the company should made aware of THEIR confusion (AS IF they care, over there).

                                         *AC in / DC out, of course.

No, the "AC IN" labeling is not an error! The Line 6 Micro Spider amp will convert the 9VAC to DC internally. 

BTW, a wall wart AC to DC converter may work as well, but after the Line 6 Micro Spider amp's internal rectifier, a 9VDC input will output much lower DC voltage than a 9VAC input. You need 12.7VDC input to get the same DC voltage after the rectifier of a 9VAC input.