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.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker - not available
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.
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 - not available
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.
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).
If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit: EUR 4,20 excl. VAT: € 3.53 / $ 3.95
We recommend one board per kit (two boards for a speaker pair)
Hobby HiFi Overview