I use a box of the same form factor under the dac for the power supply. There is always room for an additional plug on the back of the dac to get the V+, V-, and Ground into the dac enclosure.SMSL DL200 has an onboard power supply. Geshelli DACs do not. As such, Sparkos voltage regulator upgrades do not apply. If one is using a third party power supply (.i.e. discrete LPS), then it is a possibility.
Can be done with every dac.
Klaus