Ephedra   Floorstanding as in K+T 5/2015

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 94 dB
  • size (HxWxD): 1056 x 356 x 395 mm
  • frequency range (-8dB): 40 - 21000 Hz
  • crossover frequency(s): 800 Hz
  • speaker type: bass reflex

Ephedra is a 2 way floorstanding speaker with professional Monacor drivers. The kit is delivered with the SP-12/200PA woofer and the MRD-180 mounted on a MRH-200 horn. Ephedra has been developed by Holger Barske and Thomas Schmidt.

The crossover consists of a second order high-pass filter (12 dB per octave slope) for the tweeter and for the woofer a second order low-pass filter (12 dB per octave slope) .

The frequency response of this loudspeaker is linear on axis with a sag between 2000 Hz and 4000 Hz. The decay spectrum shows small resonances; apart from that it is nearly without fault . At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 1% above 300 Hz and doesn't exceed 1,5% at 95 dB at 1 m .

Our kit consists of

  • Monacor SP12/200PA, mids/woofer, 100 dB
  • Monacor MRD-180, mid/high frequency driver, 2-20 kHz, 109dB
  • Monacor MRH-200, 320 x 198 mm horn
  • Bass reflex tube for Ephedra
  • PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 1,5x Foam N25-30, 100 x 50 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2x Allen wood screws, black, 5x30 mm, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • Jantzen Cross Cap MKP capacitor 39 uF / 400V
  • Audaphon MKP CAP Superior 1.5 uF / 400 Vdc
  • Audaphon MKP CAP Superior 2.7 uF / 400 Vdc
  • Audaphon MKT CAP 47 uF / 160 Vdc
  • Autoformer 8Ohm, 30W/500Hz -8 till -14dB
  • Mundorf air core coil L140, 3.3 mH/0.58 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 12 Ohm (brown-red-black)

Kit without cabinet, price per speaker   - not available

Kit with high-end crossover

The high-end kit comes with ClarityCap capacitors of high quality and a Jantzen Cross Cap. The inductances are 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.

Kit with high-end-crossover without cabinet, price per speaker   - not available

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 13,85 excl. VAT: € 11.64 / $ 13.50

universal PCBs

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. I-2767, price per unit:   EUR 7,60 excl. VAT: € 6.39 / $ 7.41
We recommend one plate for one kit (for a pair of speakers you need 2 plates)


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