CT 311   Shelf speaker as in CT, K+T 5/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 80 dB
  • size (HxWxD): x x mm
  • frequency range (-8dB): 120 - 16000 Hz
  • crossover frequency(s): Hz
  • speaker type: passive radiator

CT 311 is a compact loudspeaker with a full range driver.

CT 311 is a loudspeaker with drivers of Tang Band . Passive radiators provide deep bass.

The kit is delivered with a Tang Band T2-2136SA full range driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a blocking circuit in series with the full range driver.

The frequency response of this speaker is nearly linear.

The decay spectrum (waterfall spectrum) shows a decelerated swing-out behaviour in the mid-range.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 2,4% above 200 Hz and doesn't exceed 4% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • 2x Tang Band T2-2136SA
  • 1m Speaker cable 2x0.75 mm2, transparent
  • Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • 2x Audaphon MKP CAP Superior 3.9 μF; / 400 Vdc
  • 2x 0.7 mm air core coil, 0.22 mH/0.34 Ohm
  • 2x Metal-oxide resistor, 5W 3.9 Ohm (orange-white-gold)

Kit without cabinet, price per speaker   EUR 104,00 excl. VAT: € 87.39 / $ 94.39

An amplifier (shown in the K+T magazine) is not included in the kit.

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils on important parts of the crossover 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 capacitors for the Tang Band T2-2136SA are of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • 2x ClarityCap ESA capacitor 3.9 μF; / 250 Vdc
  • 2x Mundorf baked varnish air core coil BL71, 0.22 mH/0.34 Ohm
  • 2x Metal-oxide resistor, 5W 3.9 Ohm (orange-white-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 118,00 excl. VAT: € 99.16 / $ 107.09

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