Compare Amphion Helium520C vs KEF R2c vs KEF Q650c
Construction
Colors
Speaker: White, Black, or Walnut / Grilles: Stone grey, Traffic red, heather violet, Turquoise blue, Sky blue, Yellow green, Sulfur yellow, Beige brown
Black Gloss, White Gloss, Walnut
Satin Black, Satin White, Walnut
Drivers | Midrange
1x 125mm (5in.) aluminium cone
1x 165mm (6.50in.) aluminium Uni-Q
Drivers | Tweeter
1x 1" titanium tweeter
1x 25mm (1in.) vented aluminium dome
1x 25mm (1in.)vented aluminium dome
Drivers | Woofer
2x 5.25" paper woofer
2x 130mm (5.25in.) hybrid aluminium
1x 165mm (6.5in.) aluminium + 2x 165mm (6.5in.) aluminium ABR passive radiator
Form Factor
Center channel loudspeaker
Center channel loudspeaker
Center channel loudspeaker
Loudspeaker Type
2-way, bass reflex
3-way, closed
2.5-way, passive radiator
Dimensions
Size | Depth
265 mm (10.5")
308.5 mm
304 mm (11.96 inches)
Size | Height
160 mm (6.5")
175 mm
210 mm (8.26 inches)
Size | Width
510 mm (20")
550 mm
629 mm (24.76 inches)
Weight
10 kg (22 lbs)
16.9 kg (37.3 lbs.)
13.6 kg (30 lbs)
Function
Crossover
1600 Hz
400Hz, 2.9kHz
2.5kHz
Performance
Frequency Response
48Hz - 25kHz (-6dB)
74Hz-28kHz (±3dB)
64Hz - 28kHz
Impedance
8 ohms
8 ohms (min 3.2 ohms)
8 ohms (min 4.2 ohms)
Max Sound Level
110 dB
110 dB
Power Input
10-150 W
15-200 W
15-150 W
Sensitivity
90 dB
87 dB
87 dB
Production
Debut
2017-12 (redesigned)
2018
2017
Made In
Finland (handmade)
China
China
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