What matters most here: is €2,490 actually cheap for this piece, or just comfortably on-market? Against your own comps, it sits essentially on the median €2,486 and just above the 25th percentile €2,465, so this is a fair asking price, not a bargain and not ambitious.
That makes it a sensible buy if the unit is clean and complete, because SoulNote’s A-1 is the kind of well-regarded integrated amp people tend to keep for its refinement, control, and musically relaxed presentation rather than flashy specs. At this level, I’d prioritize condition, service history, and whether the original remote, box, and paperwork are included; a tidy, well-kept example at €2,490 is the sort of listing a serious buyer can move on without much regret.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.