Redcatt Kellerkind   Shelf speaker as in K+T 4/2023

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 96 dB
  • size (HxWxD): 532 x 380 x 250 mm
  • frequency range (-8dB): 80 - 20000 Hz
  • crossover frequency(s): 2500 Hz
  • speaker type: bass reflex

Redcatt Kellerkind is a two way compact speaker.

Redcatt Kellerkind is a bass-reflex cabinet loudspeaker with drivers of Redcatt .

The kit is delivered with the following drivers:
- a Redcatt 141FCDX4+McGee Horn horn with driver
- a Redcatt 121FINDX4 woofer

The loudspeaker has been developed by Blue Planet Acoustic and Thomas Schmidt.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a 2nd order low-pass filter (12 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 0,5% above 300 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.

An excerpt from the Klang+Ton review (Translation of the author into English)

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • McGee PA Horn
  • Redcatt 121FIND-233
  • Redcatt 141FCDX4-337
  • 2x Bass reflex tube HP70, 70x220m, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 2x 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 2.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.4 mm air core coil 1.8 mH/0.41 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • ceramic resistor 3.3 Ohm/20 Watt

Kit without cabinet, price per speaker   EUR 195,00 excl. VAT: € 163.87 / $ 176.97

Price for a pair of custom speakers of any color   - not available (_)

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 Redcatt 141FCDX4+McGee Horn are of type polypropylen (MKP) Clarity-Cap PX 250 V.

  • ClarityCap PX capacitor 2.7 μF / 250 Vdc
  • ClarityCap PX capacitor 15 μF / 250 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.39 mH/0.51 Ohm
  • Mundorf baked varnish air core coil BL140, 1.8 mH/0.43 Ohm
  • ceramic resistor 3.3 Ohm/20 Watt

Kit with high-end-crossover without cabinet, price per speaker   EUR 223,00 excl. VAT: € 187.39 / $ 202.39

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 22 μF / 160 Vdc
  • 0.7 mm air core coil, 0.18 mH/0.36 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,50 excl. VAT: € 10.50 / $ 11.34

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 / $ 4.27
We recommend one board per kit (2 boards per speaker pair)


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