Eira   Shelf speaker as in K+T 2/2017

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 700 x 180 x 250 mm
  • frequency range (-8dB): 45 - 26000 Hz
  • crossover frequency(s): 2200 Hz
  • speaker type: bass reflex

Eira is a 2 way high-end compact speaker with up-firing bass reflex vent.

The kit provides an air motion tranformer (AMT) and two woofers of highest quality. The AMT is the very linear Air Motion Transformer Audaphon AMT-1i with very low distorsion. The woofers are SEAS Excel W15CH001. These woofers can be found in loudspeakers of highest quality and price.

Eira 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. The woofers are connected to a 2nd order low-pass filter (12 dB per octave slope).

Between 40 Hz and 20000 Hz the frequency response of this loudspeaker is perfect linear on 20 degrees. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.2% above 500 Hz and below 0.6% at 95 dB at 1 m .

Our kit consists of

  • 2x Seas Excel W15CH001 (E0037-08S)
  • Audaphon AMT-1i
  • 2x Bass reflex tube HP70, 70x220m, 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)
  • 2m Speaker cable 2x1.5 mm2 black/red
  • 1,5x 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 1.8 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 1.4 mm air core coil, 0.82 mH/0.26 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 1643,00 excl. VAT: € 1380.67 / $ 1477.32

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 1700,00 excl. VAT: € 1428.57 / $ 1528.57

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 12,90 excl. VAT: € 10.84 / $ 11.60

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 / $ 5.31
We recommend one board per kit (two boards for a speaker pair)


MDF Front for Kit Eira,
price per unit   on request

Assembled MDF cabinet (without paint) for Kit Eira,
price per unit   on request

Assembled cabinet with structure paint for Kit Eira,
price per unit   on request

Measurements Eira


Pictures Eira


technical drawing Eira


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