Rauma   Floorstanding as in K+T 2/2018

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 1300 x 180 x 250 mm
  • frequency range (-8dB): 30 - 25000 Hz
  • crossover frequency(s): 2100 Hz
  • speaker type: bass reflex
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Rauma is a two way floorstanding speaker of high quality.

Rauma is a bass-reflex cabinet loudspeaker with drivers of SEAS and Audaphon.

The kit is delivered with the following drivers:
- a Audaphon AMT 1i air motion transformer (ribbon-tweeter)
- two SEAS Excel W15CH001 woofers

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 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 is perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0.2% above 500 Hz and doesn't exceed 0.4% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Audaphon AMT-1i
  • 2x Seas Excel W15CH001 (E0037-08S)
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • 2x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 1,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2 black/red
  • 1,5x Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • ClarityCap SA capacitor 1.8 uF / 630 Vdc
  • ClarityCap SA capacitor 8 uF / 630 Vdc
  • Audaphon MKT CAP 22 uF / 160 Vdc
  • 1.3 mm air core coil, 0.82 mH/0.275 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 1109,00 excl. VAT: € 931.93 / $ 1053.08

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coil and copper foil coil 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 drivers are of type polypropylen (MKP) Clarity-Cap ESA 630 V and PWA 160V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 1158,00 excl. VAT: € 973.11 / $ 1099.61

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 12,80 excl. VAT: € 10.76 / $ 12.15

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 / $ 4.46
We recommend one board per kit (2 boards per speaker pair)


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