Back to series Quantum 720

Quantum 723

2-way bass-reflex shelf-top loudspeaker

  • Compact format, powerful sound: This shelf-top speaker lives up to the Quantum name in every respect
  • Stylish, timeless design as the perfect shell for high-end technology – looks and acoustics harmoniously combined in the smallest of spaces
  • 30 mm fabric dome with special damping and ferrofluid cooling, wide surround and Harmonic Radiation Horn (HRH) made of aluminium
  • Klippel-optimized 170 mm woofer chassis with ceramic-aluminium cone for maximum resilience and precision
  • Sturdy, rounded MDF enclosure with low-resonance 25 mm baffle in a silk-matt design and traverse system with height-adjustable spikes

2-way bass-reflex shelf-top loudspeaker

The 2-way shelf-top speakers of the Quantum 720 series are equipped with the identical loudspeaker chassis found in the larger members of the range. So the compact version also benefits from high-quality HRH tweeters with a 30 mm fabric membrane, special damping and ferrofluid cooling as well as a wide bead and Harmonic Radiation Horn made of aluminium. Responsible for the foundation is the Klippel-optimised 170 mm subwoofer with a ceramic-aluminium membrane. The MDF enclosure with rounded side sections is equipped with a low-resonance 25 mm baffle in a silk-matt lacquer finish. An Airflex port with a rounded reflex opening eliminates flow noise.

Test reviews

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High-quality chassis components

The FE Dynamics subwoofers and woofers with a size of 130mm and 170mm respectively are made of a ceramic-aluminium membrane. These harmonize perfectly with the 30 mm fabric tweeters of the range and deliver a very dynamic and transparent, spatial soundscape.

High sound performance combined with visual understatement

The enclosure shape rounded at the sides and to the rear gives the loudspeakers a discretely elegant look. The speakers produce high-quality sound.

Technical specifications

  • 2 way bass reflex
  • 6.5“ woofer-midrange
  • 30 mm tweeter
Power Handling (RMS/Max.)
  • 110 / 180 watts
Sensitivity (2.8V/1m)
  • 91 dB
  • 4 – 8 Ohms
Frequency Response
  • 30 - 52.000 Hz
Crossover Frequencies
  • 3.100 Hz
Recommended Amplifier Output
  • > 20 Watts
Dimensions (WxHxD)
  • 200 x 355 x 310 mm
  • 6.7 kg


Highly modern design with silk matt lacquer and aluminium applications
  • Shelf speaker
  • Solid metal basket with generous ventilation openings
  • Solid aluminum cover rings
  • Ceramic-aluminium cone
  • FE-Dynamics woofer-midrange
  • Ventilated voice-coil unit for maximum capacity
  • Klippel® optimised construction
  • HRH tweeter with 30 mm cloth dome, special damping and ferrofluid-cooling, big surround and aluminium Harmonic Radiation Horn
  • Amplitude and phase-optimised crossover with acoustical 24dB filters and high-quality components
  • Big Bi-Wiring/Bi-Amping connecting terminal with big screw connectors and gold-plated contacts
  • Solid and substantially braced MDF cabinet with rounded side panels and 25 mm low-resonance baffle
  • Airflex port with rounded reflex opening to minimize annoying resonances
  • Baffle in semi-gloss lacquering
  • Removable fabric protection grille with optimum sound transmission and invisible magnet attachment
Cabinet surface
  • Black Satin/Ash Decor Black
  • Black Satin/Mocca Decor