The ELAC Concentro S 503 is a reference-tier 3-way stand-mount loudspeaker that packs the design philosophy and acoustic innovations of ELAC’s larger Concentro floorstanding speakers into a compact enclosure. Featuring a curved, trapezoidal multi-layer composite cabinet with a backward-slanted baffle, the S 503 minimizes structural resonance while achieving precise time alignment between drivers.

At the center of its performance is the newly developed StepX-JET dual-concentric driver, which integrates ELAC’s signature JET 5c ribbon tweeter within a midrange ring. Featuring patented Directivity Control Ring (DRC) technology, the speaker includes three interchangeable magnetic rings to adjust the ratio of direct to reflected sound based on room acoustics. Low frequencies are handled by an 18 cm (7") AS-XR (Aluminum Sandwich Crystal Membrane) woofer capable of reaching down to 34 Hz.

KEY FEATURES & PROPRIETARY TECHNOLOGIES

• StepX-JET Dual-Concentric Driver: Combines a JET 5c folded ribbon tweeter coaxial to a midrange ring driver for point-source dispersion and precise spatial imaging.
• Patented DRC (Directivity Control Ring) Technology: Includes three magnetic attachment rings with different profiles to customize radiation characteristics for specific room environments.
• 18 cm AS-XR Crystal Cone Woofer: Extended Range driver combining a lightweight aluminum foil skin over a paper cone with crystal-pattern stamping for extreme rigidity and low-frequency extension down to 34 Hz.
• Curved Multi-Layer Composite Cabinet: Trapezoidal shape with a rearward-tilted baffle reduces internal standing waves, panel vibration, and diffraction artifacts.
• High-End 3-Way Crossover Architecture: Precision crossover network crossing over at 400 Hz and 2,600 Hz ensures seamless driver integration and balanced tonal accuracy.
• Furniture-Grade Gloss Finish: Premium piano lacquer finish with modern organic curves, complete with adjustable isolation feet and decoupling pads.

SPECIFICATIONS