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Fermat               Building Instruction   Lab Results

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 92 dB
  • size (HxWxD): 1053 x 250 x 340 mm
  • frequency range (-8dB): 37 - 30000 Hz
  • crossover frequency(s): 1700 and 2200 Hz
  • speaker type: bass reflex
FermatThe goal was to develop a loudspeaker with the bass sound pressure of the Fourier, the airiness of the Pascal and the efficiency of ... well, a yardstick still had to be found.

Ergo, lots of bass, high efficiency and airy tops.

Consequently, Dennis Frank and Peter Strassacker designed the following speaker. The Fermat is surely not a match for Avior with regards to presence, three-dimensionality and naturalness or Smallblock, but has a lot of power and an excellent efficiency.

Alcone AC15
Alcone AC 8 HE

The Fermat shows the following characteristics:

Technical data:

The Fermat kit contains:

  • 1 x Alcone AC 15 tweeter
  • 2 x Alcone AC 8 midrange / bass drivers with twin magnets
  • 2 x HP 70 bass reflex tubes
  • 1 bi-wiring terminal with gold plated brass binding posts
  • 3 x damping material
  • 1 x crossover kit,
      to be mounted on wood,
      on the right
  • 20 x screws 4 x 20 mm
  • sealing foam tape for the drivers
  • 4m cable Oehlbach Silverline (****), 2x2.5 mm2
  • description and building instruction
  • 2.2 mH i-core coil (< 0.3 Ohm)
  • 0.82 mH air core coil / 1.4 mm
  • 0.15 mH air core coil / 0.7 mm
  • 0.27 mH air core coil / 0.7 mm
  • 15 uF MKP (polypropylen) capacitor/400 V
  • 2x 10 uF MKP (polypropylen) capacitor/400 V
  • 22 uF MKP (polypropylen) capacitor/400 V
  • 1.0 Ohm MOX10 resistor (brown-black-gold)
  • 1.2 Ohm MOX4 resistor (brown-red-gold)

Price per unit without cabinet EUR 448,00

If you prefer to mount the crossover components on a universal PCB instead on wood, we recommend 2 per speaker:
Universal PCB, Order No. I-8805017,     Price   EUR 4,70

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