Eckhorn 18/3 PA Mittelhochton   Shelf speaker as in Hobby Hifi 4-5/2025

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 110 dB
  • size (HxWxD): 536 x 750 x 798 mm
  • frequency range (-8dB): 120 - 20000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: closed box

Eckhorn 18/3 PA Mittelhochtonteil is a two way compact speaker.

Eckhorn 18/3 PA Mittelhochtonteil is a horn loudspeaker with drivers of Celestion and Wavecor.

The kit is delivered with the following drivers:
- a Celestion CDX1-1747+H1-9040P horn with driver
- a Wavecor WF259PA01 woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer.

To operate the Eckhorn 18/3 PA mid-high frequency section, a DSP and a bass section are also required.

The frequency response of this speaker is nearly linear.

The decay spectrum is perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,9% above 200 Hz.

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Wavecor WF259PA01, 8 Ohm, professional woofer
  • Celestion H1-9040P Horn, Plastic, Bolt fastening
  • Celestion CDX1-1747, 1.75 inch-Kapton-Driver
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 2x 1 piece hexagon nuts M6, DIN 934 zinc-plated (934VZ006)
  • 2x 1 piece spring ring 6,1 mm, DIN 127-A zinc-plated (127-AVZ0061)
  • 2x SuM-913BL06X30-1
  • Plan for DIY kit

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

  • Mundorf MCAP EVO Oil 6.8 μF / 450 V
  • Mundorf MCAP EVO Oil 22 μF / 450 V
  • Mundorf MKP capacitor 10 μF / 400 V
  • Mundorf MKP capacitor 22 μF / 400 V
  • Mundorf baked varnish air core coil BL100, 0.39 mH/0.29 Ohm
  • Mundorf baked varnish air core coil BL140, 0.47 mH/0.19 Ohm
  • Mundorf baked varnish air core coil BL140, 0.82 mH/0.26 Ohm
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 859,00 excl. VAT: € 721.85 / $ 837.34

To operate the Eckhorn 18/3 PA mid-high frequency section, a DSP and a bass section are also required.

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 Celestion CDX1-1747+H1-9040P are of type polypropylen (MKP) Mundorf Mcap Supreme EVO Öl 700 V.

  • Mundorf MCAP EVO Oil 10 μF / 450 V
  • Mundorf MCAP EVO Oil 22 μF / 450 V
  • Mundorf Mcap Supreme EVO Oil 6,8 μF / 800V
  • Mundorf Mcap Supreme EVO Oil 22 μF / 700V
  • Mundorf copper foil coil CFC14-0.39 mH/0.14Ohm
  • Mundorf copper foil coil CFC14-0.47 mH/0.15Ohm
  • Mundorf copper foil coil CFC14-0.82 mH/0.22Ohm
  • MResist Supreme 6.8 Ohm / 20 Watt

Kit with high-end-crossover without cabinet, price per speaker   EUR 1082,00 excl. VAT: € 909.24 / $ 1054.72

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 8.38
We recommend one board per kit (two boards for a speaker pair)


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