M90 KFT   Shelf speaker as in Hobby Hifi 6/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 250 x 140 x 186 mm
  • frequency range (-8dB): 53 - 25000 Hz
  • crossover frequency(s): 3000 Hz
  • speaker type: bass reflex

M90 KFT is a two way compact speaker.

M90 KFT is a bass-reflex cabinet loudspeaker with drivers of Mivoc .

The kit is delivered with the following drivers:
- a Mivoc KFT 130 M tweeter
- a Mivoc FR 358 N midrange / bass driver

M90 KFT can be ordered with a 6 dB, or 12 dB high-pass filter for using with a subwoofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a 2nd order low-pass filter (12 dB per octave slope) for the midrange / bass driver.

The decay spectrum is nearly perfect. At 90 dB and 1 m, nonlinear distortions are below 1.3 % almost everywhere above 300 Hz.

Our kit consists of

  • Mivoc KFT 130 M
  • Mivoc FR 358 N
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 4.7 uF / 70 Vdc
  • Mundorf air core coil L50, 0.47 mH/0.93 0hm
  • Mundorf ferrite core coil F50 6.8mH/2.75Ohm
  • Mundorf H core coil H71, 3.3 mH/0.47 0hm
  • ceramic resistor 4.7 Ohm/5 Watt
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 142,00 excl. VAT: € 119.33 / $ 138.42

For the speaker you need additionally the following screws per speaker: 4 pieces cylinderhead screws M4x30 mm, 4 pieces cylinderhead screws M4x20 mm, 4 pieces of nuts M4, 10 pieces of chipboard screws 4x40 mm.

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coil 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 fullrange driver are of type polypropylen (MKP) Clarity-Cap SA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 154,00 excl. VAT: € 129.41 / $ 150.12

Our kit with 6 dB high pass filter consists of

  • Mivoc KFT 130 M
  • Mivoc FR 358 N
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 4.7 uF / 70 Vdc
  • Mundorf air core coil L50, 0.47 mH/0.93 0hm
  • Mundorf ferrite core coil F50 6.8mH/2.75Ohm
  • Mundorf H core coil H71, 3.3 mH/0.47 0hm
  • ceramic resistor 4.7 Ohm/5 Watt
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 144,00 excl. VAT: € 121.01 / $ 140.37

For the speaker you need additionally the following screws per speaker: 4 pieces cylinderhead screws M4x30 mm, 4 Stück cylinderhead screws M4x20 mm, 4 pieces of Nuts M4, 10 pieces of chipboard screws 4x40 mm.

Kit with high-end crossover and with 6 dB high-pass filter

The high-end kit is delivered with baked varnish air core coil 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 fullrange driver are of type polypropylen (MKP) Clarity-Cap SA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 181,00 excl. VAT: € 152.10 / $ 176.44

Our kit with 12 dB high-pass filter consists of

  • Mivoc KFT 130 M
  • Mivoc FR 358 N
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 4.7 uF / 70 Vdc
  • Mundorf air core coil L50, 0.47 mH/0.93 0hm
  • Mundorf ferrite core coil F50 4.7mH/2.15Ohm
  • Mundorf H core coil H71, 3.3 mH/0.47 0hm
  • ceramic resistor 3.3 Ohm/5 Watt
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 142,00 excl. VAT: € 119.33 / $ 138.42

For the speaker you need additionally the following screws per speaker: 4 pieces cylinderhead screws M4x30 mm, 4 Stück cylinderhead screws M4x20 mm, 4 pieces of Nuts M4, 10 pieces of chipboard screws 4x40 mm.

Kit with 12 dB high-pass filter and high-end crossover

The high-end kit is delivered with baked varnish air core coil 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 fullrange driver are of type polypropylen (MKP) Clarity-Cap SA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 179,00 excl. VAT: € 150.42 / $ 174.49

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 9,90 excl. VAT: € 8.32 / $ 9.65

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. I-2765, price per unit:   EUR 3,70 excl. VAT: € 3.11 / $ 3.61
We recommend one board per kit (two boards for a speaker pair)


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