ELAC Concentro S 507: scale, directivity control and the discipline of placement
ELAC’s slim Concentro S 507 hides four side-firing woofers behind an unusually composed front. The source consensus is powerful: huge spatial precision and deep bass, provided the room and system are chosen with equal care.
ELAC Concentro S 507 — the short version
What defines it
The discontinued ELAC Concentro S 507 is a four-way floorstander built around an unusually deliberate division of labour: four side-firing woofers supply scale, while the front-mounted JET 5c/high-mid module focuses the image. Directivity Control Rings add a final tuning option for the high-mid radiation pattern. Reviews consistently connect that architecture with deep, fast bass, a large soundstage and unusually exact image placement.
It is highly resolving without a clear consensus that it is harsh. The more careful conclusion is that it reveals the chain and the room, but its resolution is normally described as organised and musical rather than merely analytical.
For whom
The natural owner has a proper two-channel room, a stable amplifier that is comfortable into a nominal 4 Ω load with a 3 Ω minimum, and patience for setup. This is an especially persuasive route for listeners who want genuine low-frequency scale from a visually slim speaker, alongside strong dynamics and a convincing central image.
It is less automatic in small rooms. The cabinet’s narrow front does not reduce the acoustic consequences of four woofers, and community discussion specifically flags very small spaces as a risk. Consider a smaller speaker plus subwoofer if placement freedom is limited.
The directivity rings are best understood as finishing tools. Establish the listening triangle and sensible wall clearance first, then adjust their effect deliberately rather than using them to compensate for a bass problem.
Strengths and reservations
The strengths are bass extension with speed, high-resolution treble, a broad and deep stage, clean high-level capability and first-class construction. The qualifications are inseparable from the same qualities: bass can excite the room, toe-in matters, and the DCR rings cannot replace good positioning. Its original premium price also means a used purchase should be evaluated against the current alternatives, condition and included accessories—not against its former retail price alone.