CT 274, Shelf speaker   as in K+T 5/2014

Technical data
- impedance: 4 Ohm
- sensivity (2,83V/1m): 88 dB
- size (HxWxD): 292 x 492 x 272 mm
- frequency range (-8dB): 55 - 21000 Hz
- crossover frequency(s): 350, 3200 Hz
- speaker type: closed box

CT274 is a universal compact speaker which should be used with subwoofer. It contains Visaton tweeter, a Visaton mids and two Visaton woofer. It is developed by Holger Barske und Thomas Schmidt.
 

The crossover is a 3-way-filter. It consists of a 2rd order high-pass filters (12 dB per octave slope) and 2nd order low-pass filters.
    

Our kit consists of

  • Visaton dome tweeter SC 10 N, 8 Ohm
  • Visaton W100 S, 4 Ohm
  • 2x Visaton W170 S, 8 Ohm
  • PE sealing tape, 5x2 mm
  • 2,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Terminal T105 Au, with brass, gold plated
  • 2,5m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 4 pieces
  • Visaton Countersunk screws 3.5x25, 16 pcs
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • ClarityCap PWA capacitor 18 uF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, unetched, 100uF / 50 Vdc
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • M core coil, 3.3 mH/0.27 0hm
  • H core coil H71, 4.7 mH/0.46 0hm
  • Metal-oxide resistor, 10W 2.7 Ohm [red-purple-gold]

Kit without cabinet, price per speaker EUR 201,00 excl. VAT: € 168.91 / $ 195.93

Kit with high-end crossover

In the kit with high end crossover two ClarityCap foil capacitors are used. Instead of electrolytic capacitors only foil capacitors are delivered. In series to the mids speaker a baked varnish capacitor is used:

  • ClarityCap ESA capacitor 3.3 uF / 630 Vdc
  • ClarityCap PWA capacitor 18 uF / 160 Vdc
  • 2x Audaphon MKT CAP 100 uF / 160 Vdc
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • Mundorf baked varnish air core coil BL100, 0.47 mH/0.32 Ohm
  • M core coil M12, 3.3 mH/0.27 0hm
  • Mundorf H core coil H71, 4.7 mH/0.46 0hm
  • Metal-oxide resistor, 10W 2.7 Ohm [red-purple-gold]

Kit without cabinet, price per speaker EUR 242,00 excl. VAT: € 203.36 / $ 235.90

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).

  • Mundorf, electrolytic capacitor, unetched, 10 uF / 70 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • Metal-oxide resistor, 10W 6.8 Ohm [blue-grey-gold]


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 7,10 excl. VAT: € 5.97 / $ 6.92

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit: EUR 5,10 excl. VAT: € 4.29 / $ 4.97
We recommend two boards per kit (four boards for a speaker pair)
 


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