El Centro   Shelf speaker as in K+T 6/2023

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 600 x 250 x 450 mm
  • frequency range (-8dB): 28 - 37000 Hz
  • crossover frequency(s): 230, 2100 Hz
  • speaker type: bass reflex
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El Centro is a three way compact speaker.

El Centro is a bass-reflex cabinet loudspeaker with drivers of SEAS and Audaphon/Seas.

The kit is delivered with the following drivers:
- a Seas Excel C18EN002/A (E0060-08/06) coaxial driver
- a Seas Excel C18EN002/A (E0060-08/06) coaxial driver
- two Audaphon/SEAS WF176ALW woofers

The loudspeaker has been developed by Dennis Frank and Daniel Gattig.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
- 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 nearly perfect.

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.

An excerpt from the Klang+Ton review (El Centro/El Bass) (Translation of the author into English)

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • 2x Audaphon SEAS Titan WF176ALW (H1941-12)
  • Seas Excel coaxial driver C18EN002/A (E0060-08/06S)
  • 4x Bass reflex tube HP50, 50x143mm, black
  • 3x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 2,5x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • 2x Audaphon MKP CAP Superior 2.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • Audaphon MKT CAP 3.3 μF / 160 Vdc
  • Audaphon MKT CAP 6.8 μF / 160 Vdc
  • Audaphon MKT CAP 47 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 100 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 470 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 68 μF/100 Vdc
  • Mundorf baked varnish air core coil BL71, 0.015 mH
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 1.0 mm air core coil, 1.8 mH/0.7 Ohm
  • 2x 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Mundorf bs140 core coil 8.2 mH/0.33Ohm
  • 2x Mundorf H core coil H71, 15 mH/1.15 0hm
  • ceramic resistor 4.7 Ohm/20 Watt
  • ceramic resistor 5.6 Ohm/20 Watt
  • ceramic resistor 8.2 Ohm/20 Watt
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 47 Ohm (yellow-violet-black)

Kit without cabinet, price per speaker   EUR 1299,00 excl. VAT: € 1091.60 / $ 1178.92

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 Seas Excel C18EN002/A (E0060-08/06) are of type polypropylen (MKP) Mundorf MCAP EVO Silber Gold Öl.

  • Mundorf MCAP EVO Oil 2.7 μF / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 2.7 μF / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 10 μF / 450 V
  • Mundorf MKP capacitor 3.3 μF / 250 V
  • Mundorf MKP capacitor 6.8 μF / 250 V
  • Mundorf MKP capacitor 47 μF / 250 V
  • Mundorf, electrolytic capacitor, etched, 68 μF/100 Vdc
  • Mundorf, electrolytic capacitor, etched, 100 μF/100 Vdc
  • Mundorf, electrolytic capacitor, etched, 470 μF/63 Vdc
  • Mundorf baked varnish air core coil BL71, 0.015 mH
  • 2x Mundorf baked varnish air core coil BL71, 0.39 mH/0.51 Ohm
  • Mundorf baked varnish air core coil BL100, 1.0 mH/0.49 Ohm
  • Mundorf baked varnish air core coil BL100, 1.8 mH/0.70 Ohm
  • Mundorf bs140 core coil 8.2 mH/0.33Ohm
  • 2x Mundorf H core coil H71, 15 mH/1.15 0hm
  • ceramic resistor 4.7 Ohm/20 Watt
  • ceramic resistor 5.6 Ohm/20 Watt
  • MResist Supreme 8.2 Ohm / 20 Watt
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 47 Ohm (yellow-violet-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1511,00 excl. VAT: € 1269.75 / $ 1371.33

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).

  • JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 8,60 excl. VAT: € 7.23 / $ 7.81

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,80 excl. VAT: € 9.92 / $ 10.71
We recommend one board per kit (2 boards per speaker pair)

Measurements

measurmentsMeasurements on this speaker

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