CT 273, Shelf speaker   as in K+T 4/2014

Technical data
- impedance: 4 Ohm
- sensivity (2,83V/1m): 89 dB
- size (HxWxD): 635 x 266 x 407 mm
- frequency range (-8dB): 35 - 39000 Hz
- crossover frequency(s): 1800 Hz
- speaker type: bass reflex

CT273 shelf speaker contains two Visaton fullrange loudspeakers: Visaton BG 20 and Visaton FRS 5 X. It is developed by Holger Barske und Thomas Schmidt.
 

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) to control the small fullrange speaker. A 2nd order low-pass filter is used for the fullrange Visaton BG 20.
 

  

Our kit consists of

  • Visaton fullrange FRS 5X
  • Visaton fullrange BG 20
  • Bass reflex tube HP70, 70x220mm, black
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • Terminal T80AU (80 mm square)
  • 2,5m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 12 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.9 μF / 400 Vdc
  • Audaphon MKP CAP Superior 5.6 μF / 400 Vdc
  • Audaphon MKP CAP Superior 18 μF / 400 Vdc
  • 1.4 mm air core coil, 2.2 mH/0.46 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit without cabinet, price per speaker on request

Kit with high-end crossover

In the kit with high end crossover ClarityCap foil capacitors are used. In series to the full range speakers, ClarityCaps of type SA are used elsewhere of type PWA. In series to BG20 is a Mundorf copper foil coil, in parallel to FRS 5X a baked varnish air core coil.

  • ClarityCap SA capacitor 3.9 μF / 630 Vdc
  • ClarityCap SA capacitor 5.6 μF / 630 Vdc
  • ClarityCap PWA capacitor 18 μF / 160 Vdc
  • Mundorf copper foil coil CFC16-2.2mH/0.54Ohm
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit without cabinet, price per speaker EUR 177,00 excl. VAT: € 148.74 / $ 162.13

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).

  • ClarityCap PWA capacitor 18 μF / 160 Vdc
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 15,20 excl. VAT: € 12.77 / $ 13.92

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.. str-RA160, price per unit: EUR 5,90 excl. VAT: € 4.96 / $ 5.40
We recommend one board per kit (two boards for a speaker pair)

universal PCB

The small fullrange should be wrapped in gaffa tape. If you don't have such tape we recommend gaffa tape AT-202/SI

EUR 17,70 excl. VAT: € 14.87 / $ 16.21
 


Home   Klang+Ton Overview