CT 278   Shelf speaker as in K+T 3/2015

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 80 dB
  • size (HxWxD): 320 x 109 x 280 mm
  • frequency range (-8dB): 50 - 20000 Hz
  • crossover frequency(s): 2800 Hz
  • speaker type: bass reflex

CT 278 is a small compact box that employs a Westra mids-tweeter and a Monacor mid-woofer. This box has been developed by Guenther Jaeger.

The crossover consists of a 2nd order high-pass filter for the tweeter and a second order low-pass filter for the woofer.

Our kit consists of

  • Mids-tweeter Westra OT-57-148
  • Woofer Monacor SPH-75/8
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,25x Foam N25-30, 100 x 50 cm, black
  • Spring loaded terminal T56 D
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • Audaphon MKT CAP 5.6 μF / 160 Vdc
  • Audaphon MKT CAP 6.8 μF / 160 Vdc
  • 0.7 mm air core coil, 0.22 mH/0.39 Ohm
  • M core coil M12, 1.0 mH/0.13 0hm
  • Metal-oxide resistor, 5W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 5W 18 Ohm (brown-grey-black)

Kit without cabinet, price per speaker   - not available

Kit with high-end crossover

Kit without cabinet, price per speaker   - not available

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit:   EUR 4,20 excl. VAT: € 3.53 / $ 3.85
We recommend one boards per kit (two boards for a speaker pair)

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