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

That doesn't sound right! If the amp doesn't have a DC connector you should only use the AC inlet with an AC cord into a wall outlet.

If you are wanting to carry around a DC power supply for portability, you might need to get an all in one lithium battery and inverter charger. You will want a true sine wave inverter. But you can get a small unit to take with you outdoors and power your amplifier.

The manual says AC...

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

.

So I (am totally new to this, just got a Squier guitar) ordered a Line 6 Micro Spider amp, usee, and without the cables. I bought a DC 9V 2A power supply, only to notice from the pics (the amp is yet to arrive) that it said AC. I asked at the store where i bought the power supply, and the guy who worked there told me it was ok to plug thr DC power cable to the AC "port" of the amp, but I am not completely sure about it. Anyone has experience with something similar?

I got this,...

@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.

       Having read the output spec on their transformer incorrectly, never having seen a 2.1 mm power jack used for an AC input and that the amp will also run on  six C-Cells: I made an erroneous assumption.  (DUH/Old-Timers' Disease)

                                     Have to give Line 6 credit though.   

        For the cost of one rectifier per unit, they've probably compelled (most) anyone purchasing any of the eleven products in their 9V line and not wanting to buy stock in a battery company, to pay an additional $39.99 for the PX-2G.

                                                           SLICK!