Hobo   Floorstanding as in K+T 3/2018

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 1050 x 318 x 420 mm
  • frequency range (-8dB): 32 - 20000 Hz
  • crossover frequency(s): 900 Hz
  • speaker type: closed box

Hobo is a 2,5 way floorstanding speaker.

Hobo is a closed-cabinet loudspeaker with drivers of Celestion, Stereo Lab and Monacor.

The kit is delivered with the following drivers:
- a Celestion CDX1-1747 + Stereo Lab SL600-1 horn with driver
- a Monacor SPH-220HQ midrange / bass driver
- a Monacor SPH-220HQ woofer

The loudspeaker has been developed by Holger Barske and Thomas Schmidt.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter. A trap filter is in series.
- a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.
- a first order low-pass filter (6 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,7% above 300 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Stereo Lab Horn SL-600-1, black
  • 2x woofer Monacor SPH-220HQ
  • Celestion CDX1-1747, 1.75 inch-Kapton-Driver
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 100x50x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 4x20 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 0.68 uF / 400 Vdc
  • Audaphon MKP CAP Superior 1.0 uF / 400 Vdc
  • Audaphon MKP CAP Superior 2.7 uF / 400 Vdc
  • Audaphon MKT CAP 22 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47uF / 50 Vdc
  • Autoformer 8Ohm, 30W/500Hz -8 till -14dB
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Mundorf bs71 core coil 3.0mH/0.56Ohm
  • Mundorf bs71 core coil 5.6mH/0.82Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 12 Ohm (brown-red-black)

Kit without cabinet, price per speaker   - 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 in series to the horn driver are of type polypropylen (MKP) Clarity-Cap CSA 630.

Kit with high-end-crossover without cabinet, price per speaker   - not available

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 / $ 4.42
We recommend two boards per kit (4 boards per speaker pair)

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