Surprise TQWT   Floorstanding as in K+T 1/2024

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 914 x 210 x 345 mm
  • frequency range (-8dB): 45 - 30000 Hz
  • crossover frequency(s): Hz
  • speaker type:

Surprise TQWT is a two way floorstanding speaker.

Surprise TQWT is a TQWT (Tapered Quarter Wave Tube) loudspeaker with drivers of Sica and Redcatt.

The kit is delivered with the following drivers:
- a Sica LP 110.28/380TW 8 tweeter
- a Redcatt Exclusive 6 woofer

The loudspeaker has been developed by Baur Akustik.

The crossover consists of:
- a 3rd order high-pass filter (18 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 0,4% above 300 Hz and doesn't exceed 1,2% at 95 dB at 1 m between 300 and 15000 Hz.

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

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • Redcatt Exclusive 6, 4 Ohm
  • Loudspeaker Sica LP 110.28/380TW 8
  • Bass reflex tube HP70, 70x220m, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 97,5x49x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 1.0 mm air core coil, 1.8 mH/0.7 Ohm
  • 0.7 mm air core coil, 0.22 mH/0.34 Ohm
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit without cabinet, price per speaker   EUR 189,00 excl. VAT: € 158.82 / $ 182.65

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils 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 Sica LP 110.28/380TW 8 are of type polypropylen (MKP) Mundorf MCAP EVO Öl 450 V.

  • Mundorf MCAP EVO Oil 10 μF / 450 V
  • Mundorf MCAP EVO Oil 18 μF / 450 V
  • Audaphon MKP CAP Superior 22 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.22 mH/0.34 Ohm
  • Mundorf baked varnish air core coil BL100, 1.8 mH/0.70 Ohm
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 260,00 excl. VAT: € 218.49 / $ 251.26

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 33 μF / 160 Vdc
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • ceramic resistor 4.7 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 16,70 excl. VAT: € 14.03 / $ 16.14

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 / $ 4.54
We recommend one board per kit (2 boards per speaker pair)


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