Orkla   Floorstanding as in K+T 4/2021

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 1000 x 220 x 350 mm
  • frequency range (-8dB): 30 - 40000 Hz
  • crossover frequency(s): 120, 1750 Hz
  • speaker type: bass reflex

Orkla is a three way floorstanding speaker.

Orkla is a bass-reflex cabinet loudspeaker with drivers of SB Acoustics, Seas and Alcone.

The kit is delivered with the following drivers:
- a beryllium tweeter SB Acoustics SATORI-TW29B
- a Seas Excel W18EX001 mids driver
- an Alcone AC10 HE woofer

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

The crossover consists of:
- a 2nd order high-pass filter (12 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 0.2% above 500 Hz (that's perfect!) and doesn't exceed 0.5% at 95 dB at 1 m between 300 and 15000 Hz.

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

"The Orkla builds its merits on the already very high quality of its sister model Otra: If this box already impressed with a breathtaking and dynamic appearance, the Orkla will do at least as well and even a little better. I really don't want to claim that I can hear the 40 kilohertz that the beryllium dome reaches, but I have the very definite impression that the rigid cones and somes of the exquisite drivers provide a little more clarity, depth and precision. From the full-fledged subwoofer qualities in the deep bass area to the finest details in the highs, everything is there, without masking effects and no preferred areas over the whole frequency range. There is one small restraint: the Orkla is not a box for small rooms - it needs a little space around the side basses. But from 25 square meters I can't imagine any better full-range loudspeaker for music in all styles."

Conclusion of the magazine Klang+Ton:

"Excellent and perfectly developed floorstanding loudspeaker."

Our kit consists of

  • Seas Excel W18EX001 (E0017-08S)
  • SB Acoustics beryllium dome tweeter SATORI-TW29B
  • 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
  • Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2 black/red
  • 1,5x Pan screws 4x20 black, torx, 8 pieces
  • Allen wood screws, black, 5x30 mm, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • Audaphon MKT CAP 2.2 μF / 160 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • 2x JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • Mundorf, electrolytic capacitor, unetched, 68μF / 50 Vdc
  • Mundorf, electrolytic capacitor, unetched, 82μF / 50 Vdc
  • 1.0 mm air core coil, 0.33 mH/0.26 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 bs125 core coil 12 mH/0.51Ohm
  • Mundorf H core coil H71, 4.7 mH/0.46 0hm
  • Mundorf H core coil H71, 33 mH/1.93 0hm
  • ceramic resistor 1.5 Ohm/20 Watt
  • ceramic resistor 5.6 Ohm/20 Watt
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 1029,00 excl. VAT: € 864.71 / $ 1046.29

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 SB Acoustics SATORI-TW29B are of type polypropylen (MKP) Clarity-Cap CSA and ESA 250 V.

  • ClarityCap PWA capacitor 68 μF / 160 Vdc
  • ClarityCap PWA capacitor 82 μF / 160 Vdc
  • ClarityCap PWA capacitor 2.2 μF / 250 Vdc
  • ClarityCap PWA capacitor 10 μF / 250 Vdc
  • ClarityCap CSA capacitor 10 μF / 250 Vdc
  • ClarityCap ESA capacitor 2.2 μF / 250 Vdc
  • 2x JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL100, 0.33 mH/0.26 Ohm
  • Mundorf baked varnish air core coil BL140, 1.8 mH/0.43 Ohm
  • Mundorf bs125 core coil 12 mH/0.51Ohm
  • Mundorf H core baked varnish coil BH71, 4.7 mH/0.55 0hm
  • Mundorf H core baked varnish coil BH71, 33 mH/2.02 0hm
  • ceramic resistor 1.5 Ohm/20 Watt
  • ceramic resistor 5.6 Ohm/20 Watt
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1125,00 excl. VAT: € 945.38 / $ 1143.91

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
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • ceramic resistor 5.6 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 15,20 excl. VAT: € 12.77 / $ 15.46

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 11,80 excl. VAT: € 9.92 / $ 12.00
We recommend one board per kit (2 boards per speaker pair)


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