Atlas   Shelf speaker as in K+T 1/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 650 x 250 x 350 mm
  • frequency range (-8dB): 46 - 30000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: bass reflex
Compact loudspeaker Atlas is an high-end 2 way speaker with high efficiency.

Compact loudspeaker Atlas is an high-end 2 way speaker with high efficiency. The kit is delivered with tweeter Wavecor TW030WA11. This tweeter is perfect for applications with deep crossover frequency. Two Wavecor woofers WF182CU13 with phase-plug and very linear frequency response are within the closed cabinet.

Atlas impresses with high volume stability and brilliant sound reproduction. We recommend this loudspeaker.

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter. A blocking circuit smoothing the frequeny response from 3 kHz to 10 kHz. The Woofers are connected to a 2 nd order (12 dB per octave slope). A series-resonant-circuit is used to smoothen the frequency response at 800 Hz.

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 not higher than 0.1% between 500 Hz and 10 000 Hz and doesn't exceed 0.5% at 95 dB at 1 m. These are the advantages that are hard to exceed.

Our kit consists of

  • Wavecor silk dome tweeter TW030WA11, 4 Ohm
  • 2x WF182CU13, Wavecor Mid/Woofer, 8 Ohm, paper cone, BD, phase plug
  • 2x Bass reflex tube HP100, 100x200 mm, black
  • 3x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • PE sealing tape, 5x2 mm
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 3.5x17 black, 8 pieces
  • 0,5x Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 12 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Audaphon MKP CAP Superior 22 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • Audaphon MKT CAP 33 μF / 160 Vdc
  • 1.3 mm air core coil, 1.0 mH/0.32 Ohm
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • 0.7 mm air core coil, 3.3 mH/1.75 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 764,00 excl. VAT: € 642.02 / $ 699.80

Kit with high-end crossover

The high-end kit is delivered with a baked varnish air coils and for all critical parts of the crossover with Mundorf copper foil coils 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 of type MKP (polypropylen) and in series to the tweeter Clarity-Cap three capacitors of highest quality are used: MR 630V

Kit with high-end-crossover without cabinet, price per speaker   EUR 1676,00 excl. VAT: € 1408.40 / $ 1535.16

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 15,30 excl. VAT: € 12.86 / $ 14.01

universal PCBs

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,80 excl. VAT: € 9.92 / $ 10.81
We recommend two boards per kit (four boards for a speaker pair)


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