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It seems the SMSL M8 Dac does not work with iFi iPower:
http://www.head-fi.org/t/761310/ifi-audio-ipower-universal-ultra-low-noise-ac-dc-adapter/45
So the P1 power supply remains the only upgrade option.
I will answer my own question, it looks like at present the SMSL P1 is not available for 120VAC markets.
Is the SMSL P1 power supply available for US power 120VAC?