Stage 12   Shelf speaker as in K+T 5/2016

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 93 dB
  • size (HxWxD): 712 x 440 x 272 mm
  • frequency range (-8dB): 60 - 21000 Hz
  • crossover frequency(s): 1300 Hz
  • speaker type: bass reflex

The Stage 12 is a 2 way speaker with coaxial driver from Monacor. The kit is delivered with the Monacor SP-312CX.

The crossover consists of a 1st order high-pass filter (6 dB per octave slope) for the tweeter, a acceptor circuit is smoothing the resonance frequency of the tweeter. The woofer is connected to a 3rd order low pass filter (18 dB per octave slope).

The frequency response of this speaker is nearly linear. The decay spectrum is without extreme resonances. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 1% above 500 Hz and stays below 1% at 95 dB at 1 m (if f<5kHz).

Our kit consists of

  • Monacor SP-312CX
  • Bass reflex tube HP100, 100x200 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 3x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Allen wood screws, black, 5x30 mm, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 2.2 uF / 400 Vdc
  • Audaphon MKT CAP 1.8 uF / 160 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Audaphon MKT CAP 33 uF / 160 Vdc
  • Mundorf air core coil L140, 1.0 mH/0.30 Ohm
  • Mundorf air core coil L140, 2.2 mH/0.46 Ohm
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • ceramic resistor 3.9 Ohm/20 Watt
  • ceramic resistor 8.2 Ohm/20 Watt
  • ceramic resistor 33 Ohm/20 Watt

Kit without cabinet, price per speaker   EUR 348,00 excl. VAT: € 292.44 / $ 339.23

Kit with high-end crossover

The high-end kit is delivered complete 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 polypropylen (MKP) capacitors; for the tweeter even high quality Clarity-Cap CSA 630 V capacitors are employed.

Kit with high-end-crossover without cabinet, price per speaker   EUR 378,00 excl. VAT: € 317.65 / $ 368.47

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 11,85 excl. VAT: € 9.96 / $ 11.55

universal PCBs

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 11,70 excl. VAT: € 9.83 / $ 11.41
We recommend one board per kit (two boards for a speaker pair)


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