Back to series Quantum 1000S

Quantum 1003 S

Shelf speaker, 2-way bass reflex configuration

  • A reference product in shelf-top speaker format: The Quantum 1003 S offers perfection and unparalleled craftsmanship in the smallest of spaces
  • A joy to the eyes and ears: the most stylish design combined with outstanding Quantum technology
  • 30 mm tweeter with a particularly lightweight membrane made of semi-crystalline polymer (PTFE) for maximum efficiency
  • Klippel-optimized 170 mm "Controlled Flexing Cone" subwoofer with a ceramic-aluminium cone sandwich membrane for perfect three-dimensionality
  • Sturdy MDF enclosure with a low-resonance baffle and double-walled side panel structure with non-constant material thickness

Shelf speaker, 2-way bass reflex configuration

Audiophile components and innovative technology have been used exclusively for the 2-way bass reflex configuration in the Quantum 1000 S series to ensure an optimum sound performance. The 170 mm bass-midrange driver, which is also featured in the Quantum 1009 S floorstanding speaker, is used in combination with the 30 mm high-end tweeter with its lightweight semi-crystalline polymer cone to guarantee maximum precision and uncompromising neutrality.
The sturdy MDF housing, which is available in a high-gloss black or white finish, has been provided with a double-walled side panel configuration to ensure resonance is kept to an absolute minimum. The level of workmanship and quality of material that have gone into both the housing and the internal components are of a premium level.

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Technical specifications

  • 2 way bass reflex
  • 6.5“ woofer-midrange
  • 30 mm tweeter
Power Handling (RMS/Max.)
  • 150 / 230 Watts
Sensitivity (2.8V/1m)
  • 91 dB
  • 4 – 8 Ohms
Frequency Response
  • 27 - 75000 Hz
Crossover Frequencies
  • 2800 Hz
Recommended Amplifier Output
  • > 30 watts
Dimensions (WxHxD)
  • 230 x 360 x 315 mm
  • 11.4 kg


Highly modern design with silk matt lacquer and aluminium applications
  • Floorstanding speaker
Woofer / midrange
  • Controlled Flexing Cone: New cone geometry for controlled projection of wave fronts in the mid range, and with it the capability to reproduce a greater bandwidth 16 and 20 cm woofers with particularly flat cone profile and an adapted dust cap for enhanced all round dispersion and better synchronization with the mid-tweeter range
  • Well-ventilated die-cast basket to prevent turbulence and compression effects
  • High cone rigidity ensured by inverse ceramic/aluminium dust caps for the woofer and midrange
  • Sophisticated voice coil ventilation for a particularly high degree of resilience
  • Distortion-optimised magnet system with double induction rings and stray field optimisation
  • High-end dome tweeter with a particularly wide surround for optimised dispersion characteristics at frequencies above 20 kHz
  • Generous ventilation of the magnet system with low natural resonance
  • Copper cap-optimised drive system for minimum distortion
  • Particularly lightweight cone construction consisting of semicrystalline polymer (PTFE) for maximum efficiency
  • Solid aluminium front panel with computer-optimised sound guide
  • Large, connecting plate with gold-plated speaker terminals encapsulated in acrylic
  • Bi-wiring and bi-amping option, supplied with cable bridges for single-wire operation
  • XO mechanically insulated from the cabinet
  • Built to 24dB LKR topology standards with transformer core coils and audiophile polypropylene capacitors
  • High-quality interior cabling by Oehlbach®
  • Detachable cloth grille with optimized acoustic transmissivity and hidden magnetic fixing
  • High-quality highgloss finish
  • Double-sectioned side reinforcements with varying material thickness to reduce vibration in the cabinet
  • Extensive bracing inside the cabinet
  • Resonance-absorbing supports behind all cone chassis
  • M8 thread insert for cabinet feet, resonance-absorbing, threaded rubber feet for optimum floor protection included
  • Specially coated Airflex ports with aerodynamically rounded openings ensure an optimum bass response without ambient noise
  • Sturdy MDF cabinet with low-resonance baffle
Cabinet surface
  • Piano Black
  • Piano White