Spirit 5.1 AMT   Shelf speaker as in K+T 3/2022

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 300 x 210 x 230 mm
  • frequency range (-8dB): 58 - 30000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

Spirit 5.1 AMT is a two way compact speaker.

Spirit 5.1 AMT is a bass-reflex cabinet loudspeaker with drivers of Omnes Audio .

The kit is delivered with the following drivers:
- a Omnes Audio AMT 50 air motion transformer (ribbon-tweeter)
- a Omnes Audio MW 5.0 Alu woofer

The loudspeaker has been developed by Omnes Audio.

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 woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,3% above 300 Hz and doesn't exceed 0,9% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Omnes Audio MW 5.0 Alu
  • Omnes Audio AMT 50
  • Bass reflex tube HP50, 50x143mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Terminal T105 Au, with brass, gold plated
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 3.5x17 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 12 μF / 400 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.0 mm air core coil, 1.2 mH/0.54 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)

Kit without cabinet, price per speaker   EUR 109,00 excl. VAT: € 91.60 / $ 91.60

Kit with high-end crossover

The high-end kit is delivered 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. The capacitor for the Omnes Audio AMT 50 is of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • ClarityCap ESA capacitor 12 μF / 250 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.39 mH/0.51 Ohm
  • Mundorf baked varnish air core coil BL100, 1.2 mH/0.54 Ohm
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 135,00 excl. VAT: € 113.45 / $ 113.45

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).

  • JB, electrolytic capacitor, bipolar advanced, 47μF / 50 Vdc
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • ceramic resistor 5.6 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 9,90 excl. VAT: € 8.32 / $ 8.32

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 3.95
We recommend one board per kit (2 boards per speaker pair)


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