Hi Sean, I do have a preferred amp. . . problem is that I am not terribly familiar with Halcro amps in general. My fav is the Rowland 312. Like the Spectron, it is a switching class D amp that runs very cool to the touch. Like the Spectron it is very efficient and can drive difficult speakers. . . and like the Spectron it has loads of authority, has a greatly texture midrange and a sweet treble .; and like the Spectron it is very nuanced and 'transparent'. . . . they are both worth listening to. . . you may like them both equally, or you may prefer one to the other, or you may be indifferent to both. . . this last hypothesis not terribly likely [chuckles!]
Thinking about it, one of the most transparent amps I have ever heard and enjoyed are the Theta Citadel monoblocks. . . if your speakers are sensitive like Vandersteen 5As, they also could be absolutely marvellous! Guido