You have many options, but two speakers that are remarkable for their smoothness are Sonus Faber Cremona, and Zu Druid. The Cremona is a voiced speaker that trades some ultimate resolution for musicality, and the Druid is an intimately holistic reproducer that intentionally sacrifices some of its big brother's extreme revelatory character to retain the warmth and unity of a simpler design. Two different price points, yes, but both can be used with a wide range of gear, including the best.
Phil
Phil