Audaphon Kura floorstanding loudspeakers from K+T magazine 1/2015

Kit without housing, Price per speaker

Kura is a floor-standing loudspeaker that has an ideally sized loudspeaker for the highs, mids and lows. An air motion transformer is used for the highs, two Morel dome midrange speakers for the mids and two Wavecor woofers for the lows. The floor-standing loudspeaker is designed as a bass reflex loudspeaker. The Audaphon AMT 2i air motion transformer is used as the tweeter. An AMT was chosen because it reproduces the highs particularly lightly and airily. The midrange range should be reproduced by a midrange dome because it has good omnidirectional behavior in line with the wavelength of the emitted sounds. The Morel MDM55 midrange dome was chosen for this. The lows are produced by two Wavecor WF 182BD12 woofers. The crossover contains a 3rd order low-pass filter (18 dB per octave) that controls the two woofers. All other loudspeakers are driven by 2nd order high or low passes (12 dB per octave). The frequency response is quite linear on axis or at an angle of 15 degrees. On axis, the tweeter exaggerates slightly above 14 kHz. At an angle of 20 to 30 degrees, this exaggeration disappears. The non-linear distortions are extremely low at 85 dB (1m) sound pressure: they are well under 0.2% above 400 Hz. At 95 dB (1m) sound pressure, 0.5% is not exceeded in the frequency range between 400 and 10,000 Hz. This is quite excellent. The decay spectrum is flawless except for a resonance at around 500 Hz.

Technical data:

• Impedance: 4 Ohm
• Sound pressure level (2.83V/1m): 88 dB
• Dimensions (HxWxD): 1300 x 220 x 350 mm
• Frequency range (-8dB): 30 - 35000 Hz
• Crossover frequency(s): 850, 4000 Hz
• Principle: bass reflex box

• Air-Motion-Transformer Audaphon AMT-2i
• 2x Morel MDM 55, 55 mm soft dome midrange
• 2x Wavecor mid-woofer WF182BD12 glass fiber
• 2x bass reflex tube HP100, 100x200 mm, black
• 3x Sonofil insulation material 100 x 35 cm for 20 liters
• Pole terminals PK31, one pair, gold-plated, red+black
• 4m speaker cable 2x1.5 mm2, transparent
• Allen wood screws 4x16mm, black (MZF-8614) 12 pieces
• Pan screws 3.5x17 black, Phillips, 8 pieces
• Construction plan for the kit the crossover components (right), to be assembled on a wooden board.
• ClarityCap PWA Capacitor 82 μF / 160 Vdc
• Audaphon MKP CAP Superior 0.47 μF / 400 Vdc
• Audaphon MKP CAP Superior 1.5 μF / 400 Vdc
• Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
• Audaphon MKP CAP Superior 3.3 μF / 400 Vdc
• 2x Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
• Audaphon MKP CAP Superior 10 μF / 400 Vdc
• 0.7 mm air coil, 0.12 mH/0.29 Ohm
• 0.7 mm air coil, 0.47 mH/0.50 Ohm
• 0.7 mm air coil, 0.82 mH/0.89 Ohm
• 1.0 mm air coil, 0.82 mH/0.44 Ohm
• 1.0 mm air coil, 1.0 mH/0.49 Ohm
• 1.0 mm air coil, 2.2 mH/0.89 Ohm
• 1.4 mm air coil, 1.8 mH/0.41 Ohm
• 1.4 mm air coil, 0.33 mH/0.15 Ohm
• 2x metal oxide resistor MOX10 2.2 Ohm (red-red-gold)
• 2x metal oxide resistor MOX10 3.3 Ohm (orange-orange-gold)
• Metal oxide resistor MOX10 5.6 Ohm (green-blue-gold)
• Metal oxide resistor MOX10 6.8 Ohm (blue-gray-gold)
• Metal oxide resistor MOX10 8.1 Ohm (gray-red-gold)