Thread update and correction. Yesterday I measured 10.5V across the open circuit input of a DAD6001 powered with P48. Note that a proper measurement would be taken while under load, with the microphone or a resistor in its place in circuit, in which case the voltage will drop somewhat.. guessing to around 9V or so, but definitely higher than 5V as stated earlier.
As Aarron mentions, unless you already have DAD6001 that you wish to use with the MKE2, there are a number of alternate XLR powering adapter options that may work better for you. I use both DAD6001 and Naiant PFA's to power miniature DPAs. The PFA's are nice in that you can specify desired gain - I requested unity-gain when I ordered them years ago and although I've not measured specifically, their output is a few dB lower than DAD6001 when using the same mics into both adapters. The primary good/bad about DAD6001 is its rigidly mounted female microdot input. Good to have a direct microdot connection for mics equipped with that connector, but not so good in that once attached the microphone cable sticks straight out from the end of the adapter, making it somewhat awkward and venerable to damage if the adapter is then plugged straight into a recorder's XLR input. I resolve that by using a short XLR patch cable between the DAD6001 and recorder.