Preziosa   Shelf speaker as in K+T 4/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 238 x 163 x 240 mm
  • frequency range (-8dB): 42 - 27000 Hz
  • crossover frequency(s): 1600 Hz
  • speaker type: bass reflex

Preziosa is a small monitor with ribbon tweeter. The kit is delivered with an Expolinear TMT 130K woofer and an Expolinear RT-9 Pro ribbon tweeter. Preziosa has been developed by Thomas Schmidt.

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter. The woofer is connected to a 2 nd order low-pass filter.

The frequency response of this loudspeaker is linear on axis. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 1% above 250 Hz and rises not over 1% at 95 dB at 1 m above 800 Hz.

Our kit consists of

  • Expolinear ribbon RT-9 Pro
  • Expolinear woofer TMT 130 K
  • Bass reflex tube HP35, 35x125 mm, black
  • 0.5x Damping Sonofil 100 x 35 cm for 20 litres
  • 0.5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKP CAP Superior 15 uF / 400 Vdc
  • Audaphon MKT CAP 33 uF / 160 Vdc
  • 1.4 mm air core coil, 1.8 mH/0.43 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)

Kit without cabinet, price per speaker   EUR 565,00 excl. VAT: € 474.79 / $ 550.76

Kit with high-end crossover

The high-end kit is delivered with baked varnish air 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. All capacitors are polypropylen capacitors (MKP). The capacitors for the Tweeter are ClarityCap capacitors type ESA.

Kit with high-end-crossover without cabinet, price per speaker   EUR 606,00 excl. VAT: € 509.24 / $ 590.72

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 17,75 excl. VAT: € 14.92 / $ 17.30

universal PCBs

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 / $ 4.58
We recommend one board per kit (2 boards per speaker pair)


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