Welcome to the Circle! I had Acoustat 2+2s for 25 years and the first & most important thing they needed was an amplifier that could handle their extremely wild impedance curve and not go to hell. Sounds like you've made that step already. They needed a subwoofer for the bottom octave right from the start. Then getting the vertical angle right was the second most important & non-obvious thing. It's a pain though, because they are very tall and heavy; I started out with different thickness books, (equal thickness on both sides) under the rear edge of the baseplate. After you find the optimum tip-down angle you can get full width base wedges built. I faced mine with fairly thick self-adhesive silicone tape. You will almost certainly want/need to add a safety strap from the speaker top to the wall behind or make some sort of counter-balance if the wall is too far back (that's a good thing sound wise, along with anti-reflection absorption on that rear surface). In the end though, I hated that it had only a single, rather narrow sweet spot and a lot of venetian-blinding of the highs up and down along the sweet spot axis. A love / hate thing for me with those speakers, but mostly love. Good luck on your journey!
