Otra   Floorstanding as in K+T 2/2019

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 1000 x 220 x 350 mm
  • frequency range (-8dB): 28 - 38000 Hz
  • crossover frequency(s): 120, 1900 Hz
  • speaker type: bass reflex
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Otra is a three way floorstanding speaker.

Otra is a bass-reflex cabinet loudspeaker with drivers of Scan-Speak, SEAS and Alcone.

The kit is delivered with the following drivers:
- a Scan-Speak R2604/832000 tweeter
- a SEAS L18RCY/P (H1085-08) mids driver
- a Alcone AC10 HE woofer

The loudspeaker has been developed by Dennis Frank and Daniel Gattig.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is perfectly linear.

The decay spectrum as shown in the waterfall diagram is exemplary, free of any disturbing resonance.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,4% above 300 Hz and doesn't exceed 0,7% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Seas L18RCY/P (H1085-08)
  • ScanSpeak ring radiator R2604/832000
  • Alcone 25 cm speaker AC10 HE, aluminium cone
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 3m Speaker cable 2x1.5 mm2 black/red
  • 2,5x 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 3.3 uF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 uF / 400 Vdc
  • Audaphon MKT CAP 2.2 uF / 160 Vdc
  • Audaphon MKT CAP 10 uF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 330 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 56uF / 50 Vdc
  • Mundorf, electrolytic capacitor, unetched, 68uF / 50 Vdc
  • Mundorf air core coil L140, 0.47 mH/0.19 Ohm
  • 1.3 mm air core coil, 1.8 mH/0.45 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Mundorf bs140 core coil 15mH/0.48Ohm
  • Mundorf H core coil H71, 4.7 mH/0.46 0hm
  • Mundorf H core coil H71, 22 mH/1.49 0hm
  • ceramic resistor 3.3 Ohm/20 Watt
  • ceramic resistor 3.9 Ohm/20 Watt
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)

Kit without cabinet, price per speaker   EUR 451,00 excl. VAT: € 378.99 / $ 428.26

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 Scan-Speak R2604/832000 are of type polypropylen (MKP) Clarity-Cap ESA 250 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 508,00 excl. VAT: € 426.89 / $ 482.39

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).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 27,33 excl. VAT: € 22.97 / $ 25.95

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,70 excl. VAT: € 9.83 / $ 11.11
We recommend one board per kit (2 boards per speaker pair)


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