The barrel jack needs to be 5.5×2.1mm and center positive. This is extremely important because some adapters are center negative. Using a center negative DC adapter in a circuit requiring a center positive DC adapter may damage components.
Any quality DC adapter with a center positive barrel jack will be marked with the following symbol:
Any adapter labeled as compatible with the MPC One, MPC Live, and MPC X will work with ALL of the kits using the standard barrel jack.
Advanced PSU Kit:
You will need to look for a +45W DC adapter capable of outputting between 18-20V.
Basic PSU Kit:
You will need to look for a +30W DC adapter capable of outputting between 15-20V.
Boosted PSU Kit ONLY:
If you ONLY want to use a wall adapter, you will need a 12V, 3A power adapter. (Note that the power adapter that comes with the battery packs (listed below) will not provide enough power to operate the MPC. Those adapters are bottle-necked with a rating of 12V, 0.6A and were only designed to charge the battery packs.)
Over 2 hours of runtime was accomplished using both the TalentCell YB1203000 and YB1203000-USB.
TalentCell YB1203000 (link)
TalentCell YB1203000-USB (link)
The bigger YB1206000 and YB1206000-USB, has double the capacity which means it should get over 4 hours of runtime.
TalentCell YB1206000 (link)
TalentCell YB1206000-USB (link)