About Dialogues well driven: very fast, crystal-clear, precise, not euphonic, but not "cold" however. I remember that they could easily sound: thin, cut off in the bass with lower-mids bloom -- when driven with unmatched electronics. (It was one of the huge M-Fidelities -- 400? -- driving them to disastrous effects.)
The Supers are easier to match with amplification and get a tonally balanced sound.
A very fast pre/amp combo with some current capability is useful -- wide-bandwidth too, if possible, as per lawrensw above.
I, for one, have fond memories of these speakers and a good deal on Goldmund is rare! Enjoy!