Libertas   Floorstanding as in K+T 3/2022

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 950 x 180 x 270 mm
  • frequency range (-8dB): 40 - 34000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: bass reflex

Libertas is a two way floorstanding speaker.

Libertas is a bass-reflex cabinet loudspeaker with drivers of SEAS and Wavecor.

The kit is delivered with the following drivers:
- a Seas TWS27-6 + Visaton WG 148 R tweeter
- two Wavecor WF146WA05 woofers

The loudspeaker has been developed by Dennis Frank and Daniel Gattig.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.

The frequency response of this speaker is perfectly linear.

The decay spectrum is perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,6% above 300 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

An excerpt from the Klang+Ton review (Translation of the author into English)

"In the listening room, the Libertas presents itself from its best side: the two 13-centimetre woofers create a bass as dynamic as a large paper cone and the tweeter matches t them dynamically. The clean crossover area between the drivers pays off in the shape of a stable and precise spatial image, while the tonality hardly changes even at angles - but you can adjust the intensity of the high-frequency range. The tonal balance is absolutely on-point and can inspire friends of all music genres, because all the qualities of a htop-notch loudspeaker are offered here at a more than fair price."

Conclusion of the magazine Klang+Ton:

"Sound-wise and technically well-designed speaker, pretty to look at and absolutely inexpensive."

Our kit consists of

  • Seas TWS27-6 (Replacement for Audaphon TWS25-6)
  • waveguide Visaton WG 148 R
  • 2x Wavecor Mid/Woofer WF146WA05 glass fiber, 4 Ohm
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2,5m Speaker cable 2x1.5 mm2 black/red
  • Pan screws 4x20 black, torx, 8 pieces
  • Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Mundorf ferrite core coil P100 2.7 mH/0.57Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 338,00 excl. VAT: € 284.03 / $ 284.03

Price for a pair of custom speakers of any color   EUR 2801,00 excl. VAT: € 2353.78 / $ 2353.78

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 capacitors for the Seas TWS27-6 + Visaton WG 148 R are of type polypropylen (MKP) Mundorf MCAP EVO Öl 450 V.

  • Mundorf MCAP EVO Oil 4.7 μF / 450 V
  • Mundorf MKP capacitor 22 μF / 400 V
  • Mundorf baked varnish air core coil BL71, 0.56 mH/0.64 Ohm
  • Mundorf baked varnish air core coil BL140, 2.7 mH/0.51 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 402,00 excl. VAT: € 337.82 / $ 337.82

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).

  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 13,10 excl. VAT: € 11.01 / $ 11.01

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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