Cursa   Shelf speaker as in K+T 2/2016

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 400 x 200 x 250 mm
  • frequency range (-8dB): 39 - 31000 Hz
  • crossover frequency(s): 1650 Hz
  • speaker type: bass reflex

Cursa is a 2 way bassreflex bookshelf speaker with drivers of high quality from Wavecor. It comes with a first order crossover and with extremely well-behaved sound dispersion and other very good sonic properties.

Cursa is developed by Daniel Gattig and Dennis Frank.

The bass-reflex enclosure improves the low-frequency response of the loudspeaker system.

In Cursa the Wavecor WF152CU14, with a stable die-cast alu basket, phase-plug and a linear frequency response is used. In the upper frequency range the Wavecor TW030WA12 with wide band frequency response, and low possible crossover frequency is used.

The crossover consists of a first order high-pass filter (6 dB per octave slope) for the tweeter. The woofer is connected to a first order low-pass filter with a series-resonant-circuit to smooth the frequency response at 6000 Hz.

Between 60 Hz and 20000 Hz, the frequency response of this loudspeaker is very linear. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.2% above 300 Hz and doesn't exceed 1% at 95 dB at 1 m .

We warmly recommend this loudspeaker.

Our kit consists of

  • Wavecor silk dome tweeter TW030WA12, 8 Ohm
  • WF152CU14, Wavecor Mid/Woofer, 8 Ohm, paper cone, BD, phase plug
  • Bass reflex tube HP50, 50x145 mm, black
  • 1,5x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28 I Ni, nickel plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 0,5x 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.

  • ClarityCap PWA capacitor 1.2 μF / 160 Vdc
  • Audaphon MKP CAP Superior 5.6 μF / 400 Vdc
  • Mundorf air core coil L140, 2.7 mH/0.51 Ohm
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 406,00 excl. VAT: € 341.18 / $ 371.88

Kit with high-end crossover

The high-end kit is delivered with copper foil and baked varnish air core coil 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. The capacitor for the tweeter is a ClarityCap MR 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 606,00 excl. VAT: € 509.24 / $ 555.08

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 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.31
We recommend one board per kit (2 boards per speaker pair)


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