CT250, Floorstanding   as in K+T 5/2010

Technical data
- impedance: 4 Ohm
- sensivity (2,83V/1m): 93 dB
- size (HxWxD): 1800 x 246 x 328 mm
- frequency range (-8dB): 34 - 23000 Hz
- crossover frequency(s): 3000 Hz
- speaker type: bass reflex

The CT 250 is 1.80 meter high floorstanding speaker comprising two Visaton BG 20 full range drivers and a Monacor MRD-44PA horn driver with Dayton waveguide.

The Visaton full range driver was modified:

  • the whizzer was cut out with a carpet knife as has been done in many Klang+Ton designs, the driver was reinforced with an additional magnet glued to the rear of the unit;

the horn driver uses a Dayton 12 inch horn Waveguide H12 RW12.

The cabinet consists of two symmetrical 90 cm high units that are placed on top of one another Klang+Ton readers know this cabinet already from the kit Notch.

The CT 250 was designed by Holger Barske and Ronald Waßen.
 

    

An excerpt from the Klang+Ton review

... "The music shows a rarely audible tension in conjunction with some real bass, not too much but with vehemence and differentiation. The reproduction appears to be lightning-fast and effortless; definitely, this is no obtrusive basher. The three drivers perform in unity: no driver is intruding and there are no audible transitions. Vocals are immensely open and transparent with wonderful body and with such presence that the singer seems to be present in the room. Instruments show body and outward appearance, accompanied by their natural creaking; everything that's on the record is reproduced, nothing is omitted.

The musical stage is wide and deep and the musicians are placed with pinpoint accuracy, resulting in a credible illusion. Equipped with suitable power handling the CT 250 allows all types of musicians to perform in your lounge and some of them are even revived."


Our kit consists of

  • 2 pcs Visaton BG 20, 8 Ohm
  • 2 pcs Vifa compensation Magnet 90mm
  • Monacor MRD-44PA, 1 inch Horn Driver
  • Dayton H12RW 12 inch Round Waveguide 1 inch threaded
  • 2 pcs Bass reflex tube HP70, 70x220mm, black
  • 1/2 Polyurethane foam N25, 100 x 50 cm
  • 2 pcs Polyester damping material, 125 g for 20L volume
  • 3 pairs Binding Posts
  • 3m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • electrolytic capacitor, unetched, 10 μF / 70 Vdc
  • electrolytic capacitor, unetched, 15uF / 70 Vdc
  • MKP capacitor 1.5 μF / 400V
  • MKP capacitor 1.8 μF / 400V
  • MKP capacitor 2.2 μF / 400V
  • MKP capacitor 15 μF / 400V
  • Baked varnish air core coil 0.12 mH/0.19 Ohm
  • Baked varnish air core coil 0.15 mH/0.21 Ohm
  • Baked varnish air core coil 0.39 mH/0.37 Ohm
  • Baked varnish air core coil 1.5 mH/0.76 Ohm
  • Mundorf air core coil L71, 0.068 mH
  • Ceramic resistor 3.3 Ohm/20 Watt
  • MOX10 resistor 2.2 Ohm/10Watt (red-red-gold)
  • MOX10 resistor 8.2 Ohm/10Watt (grey-red-gold)
  • MOX10 resistor 10 Ohm/10Watt (brown-black-black)

Important note: The coil with 1.5 mH and 0.9 mm wire diameter connected in series to the woofers as specified in Klang+Ton magazine overheats at high volumes. Those of you who wish to listen at high levels should go for the high-end crossover.

Kit without cabinet, price per speaker - not available

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit: EUR 8,60 excl. VAT: € 7.23 / $ 7.81
We recommend one board per kit (two boards for a speaker pair)

Kit with high-end crossover

Our high-end version comprises only MKP capacitors instead of etched capacitors.

  • MKP capacitor 1.5 μF / 400V
  • MKP capacitor 1.8 μF / 400V
  • MKP capacitor 2.2 μF / 400V
  • MKP capacitor 10 μF / 400V
  • 2 pcs MKP capacitor 15 μF / 400V
  • Baked varnish air core coil 0.12 mH/0.19 Ohm
  • Baked varnish air core coil 0.15 mH/0.21 Ohm
  • Baked varnish air core coil 0.39 mH/0.37 Ohm
  • Baked varnish air core coil 1.5 mH/0.76 Ohm
  • Mundorf air core coil L71, 0.068 mH
  • Ceramic resistor 3.3 Ohm/20 Watt
  • MOX10 resistor 2.2 Ohm/10Watt (red-red-gold)
  • MOX10 resistor 8.2 Ohm/10Watt (grey-red-gold)
  • MOX10 resistor 10 Ohm/10Watt (brown-black-black)

Kit with high-end- crossover without cabinet, price per speaker - not available

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit: EUR 8,60 excl. VAT: € 7.23 / $ 7.81
We recommend one board per kit (two boards for a speaker pair)

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).

  • electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 0.7 mm air core coil, 0.22 mH/0.39 Ohm
  • MOX10 resistor 6.8 Ohm/10Watt (blue-grey-gold)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 14,60 excl. VAT: € 12.27 / $ 13.25
 


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