Quantum 677

Quantum 677


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.

3 way bass reflex
30 mm tweeter
170 mm midrange
2 x 170 mm woofer
Power Handling (RMS / Max.)
200 / 350 Watts
Sensitivity (2.8V/1m)
93 dB
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
19.5 kg
Cabinet surface
Piano black/ Ash decor black
Piano black/ Ash decor mocca