Monitor CB   Shelf speaker as in K+T 2/2014

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 430 x 300 x 350 mm
  • frequency range (-8dB): 34 - 30000 Hz
  • crossover frequency(s): 1600 Hz
  • speaker type: closed box

Oliver Martin developed Monitor CB. CB stands for closed bass. The Monitor CB comprises a Monacor tweeter with wave guide and a Monacor bass driver.

The principle is GHP. This denotes "Geschlossene Bauweise mit Hochpass" in German, which means "sealed cabinet with high pass". Here you can find some theory about high pass.

The crossover consists of a second order high pass and a second order low pass.

Our kit consists of

  • Monacor dome tweeter DT-254
  • Special horn front attachment (wave guide) WG-300
  • Monacor woofer SPH-220HQ
  • PE sealing tape, 5x2 mm
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 0,25x Foam N25, 100x50x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 12 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Audaphon MKT CAP 47 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • ClarityCap PWA capacitor 0.15 uF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 1.0 uF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Mundorf air core coil L100, 0.56 mH/0.36 Ohm
  • Mundorf air core coil L140, 3.9 mH/0.65 Ohm
  • Metal-oxide resistor, 10W 18 Ohm (brown-grey-black)

Kit without cabinet, price per speaker   EUR 249,00 excl. VAT: € 209.24 / $ 242.72

Kit with high-end crossover

Our Kit with high end crossover provides high-quality ClarityCap film capacitors and Mundorf electrolytic capacitors. Mundorf baked varnish coils are used as a coil.

Kit without cabinet, price per speaker   EUR 294,00 excl. VAT: € 247.06 / $ 286.59

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 9,70 excl. VAT: € 8.15 / $ 9.46

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. I-2767, price per unit:   EUR 7,60 excl. VAT: € 6.39 / $ 7.41
We recommend one board per kit (two boards for a speaker pair)


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