You can use the "standard" Alchemy supplies...they have 7009 stamped on them, or you can use the PS-1..i think 7655 was the manufacturers number (but not sure).
The DITB (DAC section) requires plus and minis 15-18vDC. The connector should be wired for plus voltage at the tip, minus voltage at the center band, and ground to the base.
The DTI.Plus only needs the plus voltage at the tip and ground at the base (no center band connection). A simple 12vDC adapter will work fine.