Akerselva   Floorstanding as in K+T 3/2017

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 1100 x 240 x 365 mm
  • frequency range (-8dB): 30 - 40000 Hz
  • crossover frequency(s): 220, 2500 Hz
  • speaker type: closed box
Akerselva is a 3 way high-end floorstanding speaker with coaxial driver and four woofers. Enlarge

Akerselva is a 3 way high-end floorstanding speaker with coaxial driver and four woofers.

In the kit the Seas Excel C18EN002/A coaxial driver is working in the mid and high frequency range. Four woofers of type Wavecor SW182BD01 in a closed cabinet provide a powerful and precise bass reproduction.

Akerselva has been developed by Daniel Gattig and Dennis Frank.

The crossover consists of a 2nd order high-pass filter (12 dB per octave slope) for the tweeter, a bandpass filter consisting of a high and low pass filter of second and third order with an voltage divider for the midrange and a second order low pass filter with parallel RCL circuit to reduce the impedance peak for the woofer.

Between 40 Hz and 18000 Hz, the frequency response of this loudspeaker is very linear on axis. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.6% above 500 Hz and mostly below 1% at 95 dB at 1 m .

Our kit consists of

  • Seas Excel C18EN002/A (E0060-08/06S)
  • 4x Wavecor Subwoofer SW182BD01, die cast, 4 Ohm
  • 2x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 4m Speaker cable 2x1.5 mm2 black/red
  • 3x Pan screws 3.5x17 black, 8 pieces
  • Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.8 uF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 2.7 uF / 400 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • 2x Audaphon MKT CAP 47 uF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • Mundorf baked varnish air core coil BL71, 0.015 mH
  • Mundorf air core coil L140, 0.47 mH/0.19 Ohm
  • Mundorf air core coil L140, 0.56 mH/0.20 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 3.3 mH/1.75 Ohm
  • Mundorf bs140 core coil 4.7mH/0.24Ohm
  • Mundorf H core coil H71, 3.3 mH/0.47 0hm
  • Mundorf H core coil H71, 33 mH/1.93 0hm
  • 2x ceramic resistor 10 Ohm/20 Watt
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • 2x Metal-oxide resistor, 10W 10 Ohm (brown-black-black)
  • 2x Metal-oxide resistor, 10W 12 Ohm (brown-red-black)
  • Metal-oxide resistor, 10W 47 Ohm (yellow-violet-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 and copper foil 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. All capacitors in series to the drivers are of type polypropylen (MKP). In series to the tweeter Clarity-Cap MR 630 V and CSA 630 V are employed.

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

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 8,00 excl. VAT: € 6.72 / $ 7.66

universal PCBs

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 / $ 4.50
We recommend four boards per kit (8 boards per speaker pair)

Cabinet

MDF Front for Kit Akerselva,
price per unit   EUR 75,00 excl. VAT: € 63.03 / $ 71.85

Assembled MDF cabinet (without paint) for Kit Akerselva,
price per unit   EUR 430,00 excl. VAT: € 361.34 / $ 411.93

Assembled cabinet with structure black paint for Kit Akerselva,
price per unit   EUR 530,00 excl. VAT: € 445.38 / $ 507.73

Assembled cabinet with structure white, or grey paint for Kit Akerselva,
price per unit   EUR 580,00 excl. VAT: € 487.39 / $ 555.63

Assembled cabinet with fine paint black, or white for Kit Akerselva,
price per unit   EUR 760,00 excl. VAT: € 638.66 / $ 728.07

Assembled cabinet with fine paint colored for Kit Akerselva,
price per unit   EUR 840,00 excl. VAT: € 705.88 / $ 804.71

Measurements Akerselva

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Pictures Akerselva

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technical drawing Akerselva

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