Double Three   Shelf speaker as in K+T 6/2018

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 260 x 134 x 229 mm
  • frequency range (-8dB): 52 - 17000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

Double Three is a compact loudspeaker with a full range driver.

Double Three is a bass-reflex cabinet loudspeaker with drivers of Omnes Audio .

The kit is delivered with the following drivers:
- a Omnes Audio BB 3 AL full range driver
- a Omnes Audio BB 3 AL woofer

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

The crossover consists of:
- a first order low-pass filter (6 dB per octave slope) for the woofer.
- a wave trap (notch) circuit in series for the fullrange driver.

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 1% above 200 Hz and doesn't exceed 1,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • 2x Omnes Audio, full range BB3 AL
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • 0,5x 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 12 uF / 400 Vdc
  • 1.0 mm air core coil, 0.33 mH/0.26 Ohm
  • Mundorf H core coil H100, 3.3 mH/0.27 0hm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 89,00 excl. VAT: € 74.79 / $ 86.76

Important: Additionally you need 25mm plastic tubes for the bassreflex system, it is not included in the kit.

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 capacitors for the fullrange driver are of type polypropylen (MKP) Clarity-Cap ESA 250.

Kit with high-end-crossover without cabinet, price per speaker   EUR 102,00 excl. VAT: € 85.71 / $ 99.43

Impedance correction in the high frequency range

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 7,30 excl. VAT: € 6.13 / $ 7.12

Impedance correction bassrange

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 15,00 excl. VAT: € 12.61 / $ 14.62

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. I-2765, price per unit:   EUR 3,70 excl. VAT: € 3.11 / $ 3.61
We recommend one board per kit (two boards for a speaker pair)


Home   Klang+Ton Overview