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Quantum 677

Floor-standing loudspeaker, 3-way bass reflex with double bass


The three-way Quantum 677 floor-standing loudspeaker is the flagship in the Quantum 670 series. Elegantly rounded MDF case possessing sophisticated struts and a varnished 25 mm acoustic baffle constitute the strong foundation for high-strength aluminium ceramic cones and the lightweight dome made of synthetic silk with a redesigned horn flare.



Floor-standing loudspeaker, 3-way bass reflex with double bass


The Quantum 677 is the flagship in the Quantum 670 series, a further development of Magnat´s Quantum 650 series, which was highly praised in many test reviews. The elegantly rounded MDF case with its elaborate struts and varnished 25 mm acoustic baffle constitute the strong foundation for high-strength aluminium-ceramic cones and the lightweight dome made of synthetic silk with redesigned horn flare.




The Quantum 677 is available with a black and mocha-coloured corpus, the baffle on both versions possesses a black piano-lacquer finish. Two bass loudspeakers and one mid-range loudspeaker with a diameter of 170 mm in conjunction with Magnat´s proven ceramic-aluminium sandwich cone in streamlined baskets made from carbon-fibre-reinforced ABS are responsible for highly precise sound and harmonious transitions to the dynamic second-generation "HRH" silk dome.

Test reviews

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Technical specifications


Principle
  • 3 way bass reflex
Drivers
  • 2 x 6.5“ woofer
  • 6.5“ midrange
  • 30 mm tweeter
Power Handling (RMS/Max.)
  • 200 / 350 Watts
Sensitivity (2.8V/1m)
  • 93 dB
Impedance
  • 4 – 8 Ohms
Frequency Response
  • 20 – 50.000 Hz
Crossover Frequencies
  • 300 Hz, 3100 Hz
Recommended Amplifier Output
  • > 30 watts
Dimensions (WxHxD)
  • 202 x 1080 x 316 mm
Weight
  • 19.5 kg

Highlights


Woofer / midrange
  • FE-Dynamics bass/mid-range loudspeaker with ceramic-aluminium cones, 25 mm voice-coil unit and a flow-optimised basket made from carbon-fibre composite
Highlights
  • Klippel® optimised construction
Tweeter
  • HRH tweeter 2. generation with 30 mm cloth dome, special damping and ferrofluid-cooling, big surround and Harmonic Radiation Horn
Crossover
  • High-quality interior cabling
Connections
  • Big bi-wiring connecting terminal with solid screw connectors
Cabinet
  • Airflex ports with extremely wide openings for optimized bass connection
  • Baffle with high-quality lacquering
  • Solid base plate
  • Solid and substantially braced MDF cabinet with rounded side panels and 25 mm low-resonance baffle
  • Removable protection grill with optimum sound transmissibility
  • Metal spikes included
Cabinet surface
  • Piano black/ Ash decor black
  • Piano black/ Ash decor mocca