Sirius   Floorstanding as in K+T 3/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 1020 x 250 x 250 mm
  • frequency range (-8dB): 22 - 30000 Hz
  • crossover frequency(s): 270, 1900 Hz
  • speaker type:

Sirius is an high-end 4 way floorstanding speaker with high quality chassis and dipole tweeter . The kit provides an air motion tranformer of highest quality Audaphon AMT 1i. To be adapted to the room acoustics on the rear is an Audiopur AMT13M as dipole. The Wavecor WF182CU13 is used as midrange and Wavecor SW223BD02 with two passive radiators bring out a deep bass.

Sirius is developed by Daniel Gattig and Dennis Frank.

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter, a 2nd order bandpasss filter with an voltage divider for the midrange and a 2nd order lowpass with parallel RCL to reduce the impedance for the woofer. On the rear an air motion transformer with level control is used to adapt the loudspeaker to the room properties. It is connected to a 1st order high-pass filter.

The frequency response of this speaker a very linear. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.1% between 600 and 6000 Hz; at a level of 95 dB at 1 m the distortion is below 0.2%.

Our kit consists of

  • Audaphon AMT-1i
  • Audiopur AMT13M
  • WF182CU13, Wavecor Mid/Woofer, 8 Ohm, paper cone, BD, phase plug
  • Wavecor Subwoofer SW223BD02, die cast, 4 Ohm
  • 2x Wavecor PR223BD02 Passive Radiator, die cast
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 4m Speaker cable 2x1.5 mm2, transparent
  • 2,5x Allen wood screws, black, 5x30 mm, 8 pieces
  • 1,5x Allen wood screws, black, 4x25 mm, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.

  • Audaphon MKP CAP Superior 2.2 uF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 uF / 400 Vdc
  • Audaphon MKP CAP Superior 22 uF / 400 Vdc
  • Audaphon MKT CAP 10 uF / 160 Vdc
  • Audaphon MKT CAP 47 uF / 160 Vdc
  • Audaphon MKT CAP 100 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 100 uF/100 Vdc
  • Mundorf, electrolytic capacitor, etched, 470 uF/63 Vdc
  • 1.3 mm air core coil, 0.82 mH/0.275 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Mundorf H core coil H71, 4.7 mH/0.46 0hm
  • Mundorf H core coil H71, 22 mH/1.49 0hm
  • Monacor transformer coil LSI-56T, 5.6mH/0.15 Ohm
  • ceramic resistor 1.2 Ohm/20 Watt
  • ceramic resistor 2.7 Ohm/20 Watt
  • ceramic resistor 3.3 Ohm/20 Watt
  • ceramic resistor 3.9 Ohm/20 Watt
  • ceramic resistor 5.6 Ohm/20 Watt
  • Metal-oxide resistor, 10W 3.9 Ohm 2% (orange-white-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm 2% (yellow-violet-gold)
  • Volume control mono AT-52H

Kit without cabinet, price per speaker   EUR 1468,00 excl. VAT: € 1233.61 / $ 1455.66

Kit with high-end crossover

The high-end kit is delivered with copper foil and backlack air coils on important parts of the crossover for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. All capacitors are foil capacitors of type polypropylen (MKP) and for the tweeter even Clarity-Cap ESA 250 V are employed.

Kit with high-end-crossover without cabinet, price per speaker   EUR 1572,00 excl. VAT: € 1321.01 / $ 1558.79

Impedance correction

If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,50 excl. VAT: € 10.50 / $ 12.39

universal PCBs

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.66
We recommend three boards per kit (6 boards per speaker pair)


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