Ariosa   Shelf speaker as in K+T 3/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 316 x 192 x 253 mm
  • frequency range (-8dB): 50 - 30000 Hz
  • crossover frequency(s): 3100 Hz
  • speaker type: bass reflex
Ariosa is a shelf speaker, reviewed in journal K+T 3/2017

Ariosa is a 2 way compact speaker with AMT (air-motion-transformer).

The kit provides an air motion tranformer (AMT) and a woofer. The AMT is the Gradient AT1R and the woofer is a Seas CA15RLY.

Ariosa is developed by Thomas Schmidt.

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter. The woofer is connected to a 2nd order low-pass filter (12 dB per octave slope).

Between 100 Hz and 20000 Hz the frequency response of this loudspeaker is 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 0.5% above 500 Hz and below 1% at 95 dB at 1 m .

Our kit consists of

  • Air Motion Transformer Gradient AT1R
  • Seas CA15RLY (H1216-08)
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x2.5 mm2, transparent
  • 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 3.3 μF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF / 400 Vdc
  • Audaphon MKP CAP Superior 18 μF / 400 Vdc
  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • Mundorf air core coil L140, 0.82 mH/0.26 Ohm
  • Mundorf air core coil L140, 1.5 mH/0.38 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • ceramic resistor 8.2 Ohm/20 Watt
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 394,00 excl. VAT: € 331.09 / $ 341.03

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. All capacitors are of type polypropylen (MKP). In series to the tweeter Clarity-Cap CSA 630 V are employed.

Kit with high-end-crossover without cabinet, price per speaker   EUR 466,00 excl. VAT: € 391.60 / $ 403.34

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 19,70 excl. VAT: € 16.55 / $ 17.05

universal PCBs

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. str-RA160, price per unit:   EUR 5,90 excl. VAT: € 4.96 / $ 5.11
We recommend one board per kit (two boards for a speaker pair)


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