The Horizon does the disappearing act. Something has to drive it — cleanly, reliably, and right-sized to the room. For that, Evan points at one place: the AudioControl Bijou series. Here's why, and which one to reach for.
Leon's Horizon bars are passive — no amplification baked in. That's a feature: it lets you drive them with electronics worthy of the cabinetry instead of whatever's stuffed in a plastic soundbar. But it does mean the amp is your call, and a mismatched amp is the fastest way to make a beautiful system sound ordinary.
Under-power a multichannel Horizon off a crowded AVR and it never opens up. The client paid for hidden, high-fidelity sound and got "fine." That's a callback, not a referral.
A clean, right-sized dedicated amp. The Bijou series is compact enough to live in the rack you actually have, and built to make a passive Horizon effortless to commission.
Match the channel count to the Horizon and the room; confirm current models, power ratings, and pricing with AudioControl / AVPro. When in doubt, send Evan the front-of-room spec and he'll point at the right one.