CT 298   Shelf speaker as in K+T 4/2018

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 195 x 120 x 140 mm
  • frequency range (-8dB): 70 - 22000 Hz
  • crossover frequency(s): 5100 Hz
  • speaker type: bass reflex

CT 298 is a two way compact speaker.

CT 298 is a bass-reflex cabinet loudspeaker with drivers of Dayton and Gradient.

The kit is delivered with the following drivers:
- a Dayton AMT Mini-8 air motion transformer (ribbon-tweeter)
- a Gradient CR-080 midrange / bass driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1% above 300 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Dayton AMT MINI-8
  • Gradient CR-080
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m 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 MKP CAP Superior 3.3 uF / 400 Vdc
  • Audaphon MKT CAP 3.3 uF / 160 Vdc
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 0.7 mm air core coil, 0.15 mH/0.28 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 12 Ohm (brown-red-black)

Kit without cabinet, price per speaker   EUR 84,00 excl. VAT: € 70.59 / $ 81.18

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. The capacitor for the tweeter is of type polypropylen (MKP) Clarity-Cap ESA 250 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 96,00 excl. VAT: € 80.67 / $ 92.77

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 10,53 excl. VAT: € 8.85 / $ 10.18

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.54
We recommend one board per kit (2 boards per speaker pair)


Home   Klang+Ton Overview