Scan Concert   Shelf speaker as in K+T 4/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 350 x 180 x 349 mm
  • frequency range (-8dB): 45 - 26000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: bass reflex

Scan Concert is a two-way bassreflex bookshelf speaker with high quality drivers from Scan-Speak. Tweeter Scan-Speak D2905/9300 is working in the upper frequency range and Scan-Speak 15W/4531G00 is for the lower frequency range.

Scan Concert has been developed by Wolfgang Grasshoff.

The crossover consists of a third order high-pass filter (18 dB per octave slope) for the tweeter. A voltage divider reduces the volume . The woofer is connected to a 2nd order low-pass filter.

Between 80 Hz and 20000 Hz, the frequency response is nearly flat. Apart from some weak resonances the decay spectrum is perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.5% above 700 Hz and stays below 1% at 95 dB at 1 m .

Our kit consists of

  • ScanSpeak tweeter D2905/9300-00, 1/2 package
  • ScanSpeak woofer 15W4531 G, 1/2 package
  • 2x Bass reflex tube HP50, 50x145 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • ClarityCap PWA capacitor 8.2 uF / 160 Vdc
  • ClarityCap PWA capacitor 33 uF / 160 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Mundorf air core coil L140, 1.5 mH/0.38 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 375,00 excl. VAT: € 315.13 / $ 359.24

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core 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 Caps of type ESA 250 V are employed.

Kit with high-end-crossover without cabinet, price per speaker   EUR 417,00 excl. VAT: € 350.42 / $ 399.48

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 15,10 excl. VAT: € 12.69 / $ 14.47

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 / $ 4.50
We recommend one board per kit (2 boards per speaker pair)


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