ELAC Concentro S503 Bookshelf Speakers, Pair
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About ELAC Concentro S503 Bookshelf Speakers, Pair
ELAC Concentro S503 Bookshelf Speakers Product Description:
Make no mistake—the S 503 is a true Concentro in every sense. The design innovations and technical expertise behind the S 507 and S 509 are now distilled into a more compact form. Its trapezoidal profile, convex baffle, and subtly angled cabinet come together in an organically sculpted design that makes a bold visual statement. A comprehensive array of patented technologies and a newly developed woofer magnet system ensure exceptional sonic performance. The sound can be precisely tailored to the room, delivering effortless, immersive listening. Close your eyes, and the compact dimensions disappear—leaving only the music.
Modern Hybrid Design
Creating the Concentro experience in a smaller package is no easy feat. For the Concentro S series loudspeakers, we've taken the progressive design elements from the Concentro Series, and combined them with the clean lines of the Vela Series to create a strong visual presence.

Exchangeable Wave Guides to Optimize Listening
Since no two rooms are the same, midrange directivity can be adjusted using three exchangeable Directivity Control Rings (DCRs). This provides the ability to optimize the Concentro S Loudspeakers for the listening space. They range from more Direct (often preferred for nearfield) to more Diffuse (often preferred for farther listening positions).

Engineered for Low Distortion
Based on ELAC’s Aluminum-Sandwich AS Technology. Resembling the surface of a large crystal, the aluminum-foil stamping stiffens the aluminum dome, diminishing resonances and minimizing coloration, while improving power handling and dynamics. The voice coil design of the drivers results in an expanded frequency range, and driver surround allows for longer cone excursions for truly prodigious volume and lowest distortion, a unique engineering achievement for a driver of its size.
Lightning-Fast Response and Wide Dynamic Range
Delivering true high-definition sound, ELAC’s JET 5 tweeter enthralls with its lightning-fast response and wide dynamic range, offering minimal distortion, lots of headroom, and a distinctly wider frequency range than conventional dome tweeters. The ELAC JET tweeter is one of the most legendary tweeters in the industry and has won international praise for its transparent and effortless sound image.
Specifications:
| Height | 400 mm |
| Width | 225 mm |
| Depth | 372 mm |
| Weight | 13.4 kg |
| Type | 3-way, bass reflex |
| Woofer | 1 × 180 mm, AS-XR cone |
| Midrange | 1 × 50 | 130 mm Ø, AS-XR AL cone |
| Tweeter | JET 5c |
| Crossover Frequency | 400 | 2600 Hz |
| Nominal / Peak Power Handling | 120 W / 1200 W |
| Peak Power Handling | 400 W |
| Minimum Impedance | 4.8 Ω at 120 Hz |
| Sensitivity | 87 dB / 2.83 V / m |
| Nominal Impedance | 4–8 Ω |
| Recommended Amplifier Power | 60–500 W / channel |
| Finishes | High-Gloss Black Lacquer, White Lacquer, Walnut Veneer |
| Accessories | Bi-wiring jumper set |
| Accessories | 3 × DCR (Directivity Control Ring) |
