Ella   Shelf speaker as in K+T 3/2020

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 89 dB
  • size (HxWxD): 640 x 360 x 270 mm
  • frequency range (-8dB): 45 - 23000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: bass reflex

Ella is a two way compact speaker.

Ella is a bass-reflex cabinet loudspeaker with drivers of Scan Speak .

The kit is delivered with the following drivers:
- a Scan Speak D3404/552000 tweeter
- a Scan Speak 21WE8542T00 woofer

The loudspeaker has been developed by Thomas Schmidt and Holger Barske.

The crossover consists of:
- a 3rd order high-pass filter (18 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 nearly 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 0,5% above 300 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • ScanSpeak Ellipticor D3404/552000, one unit
  • ScanSpeak Ellipticor 21WE/8542T00
  • Bass reflex tube BR15.34, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 97,5x49x4 cm, black
  • Binding Post PK28 I, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 1,5x Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 6.8 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 12 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF; / 400 Vdc
  • Mundorf air core coil L140, 3.0 mH/0.55 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 1620,10 excl. VAT: € 1361.43 / $ 1564.23

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 Scan Speak D3404/552000 are of type polypropylen (MKP) Clarity-Cap CSA 630 V.

  • ClarityCap CSA capacitor 6.8 μF; / 630 Vdc
  • ClarityCap CSA capacitor 15 μF; / 630 Vdc
  • Audaphon MKP CAP Superior 12 μF; / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL140, 3.0 mH/0.55 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1669,82 excl. VAT: € 1403.21 / $ 1612.24

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 22 μF; / 160 Vdc
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • ceramic resistor 12 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,57 excl. VAT: € 10.56 / $ 12.14

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 4,58 excl. VAT: € 3.85 / $ 4.42
We recommend one board per kit (2 boards per speaker pair)


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