CT 321   Floorstanding as in K+T 3/2022

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 89 dB
  • size (HxWxD): 930 x 280 x 268 mm
  • frequency range (-8dB): 48 - 18000 Hz
  • crossover frequency(s): 2000 Hz
  • speaker type: bass reflex

CT 321 is a two way floorstanding speaker.

CT 321 is a bass-reflex cabinet loudspeaker with drivers of Monacor .

The kit is delivered with the following drivers:
- a Monacor MHD-55 horn with driver
- a Monacor SP-250P woofer

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 (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 2,8% above 300 Hz and doesn't exceed 6% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • SP-250P replacement for Peerless PT250s diameter larger d=265mm
  • Monacor MHD-55
  • Bass reflex tube BR15.34, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 97,5x49x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 2,5x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 3.9 μF / 400 Vdc
  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • Mundorf air core coil L140, 2.2 mH/0.46 Ohm
  • 1.0 mm air core coil, 0.56 mH/0.36 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 18 Ohm (brown-grey-black)

Kit without cabinet, price per speaker   EUR 286,00 excl. VAT: € 240.34 / $ 240.34

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 Monacor MHD-55 are of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • ClarityCap ESA capacitor 1 μF / 250 Vdc
  • ClarityCap ESA capacitor 3.9 μF / 250 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.27 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL100, 0.56 mH/0.36 Ohm
  • Mundorf baked varnish air core coil BL140, 2.2 mH/0.46 Ohm
  • Metal-oxide resistor, 10W 18 Ohm (brown-grey-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 312,00 excl. VAT: € 262.18 / $ 262.18

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).

  • Audaphon MKT CAP 33 μF / 160 Vdc
  • ceramic resistor 15 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 10,50 excl. VAT: € 8.82 / $ 8.82

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 / $ 3.95
We recommend one board per kit (2 boards per speaker pair)


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