Blue Start 5 TQWT   Floorstanding as in K+T 6/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 950 x 160 x 238 mm
  • frequency range (-8dB): 45 - 31000 Hz
  • crossover frequency(s): Hz
  • speaker type:

Blue Start 5 TQWT is a floorstanding with Omnes Audio and LPG drivers. The initials TQWT are an abbreviation for Tapered Quarter Wave Tube. This is a mixture of transmissionline loudspeaker an bass reflex loudspeaker. Blue Start 5 TQWT has been developed by Blue Planet Acoustic.

The crossover consists of a 2nd order high-pass filter (12 dB per octave slope) for the tweeter and a 2nd order low-pass filter for the woofer. A parallel RC circuit is smoothing the impedance of the woofer.

The frequency response of this speaker is linear. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.5% above 300 Hz and rarely exceeds 1% at 95 dB at 1 m .

Our kit consists of

  • Omnes Audio T25 H
  • Woofer LPG 13
  • Bass reflex tube BR50, 50x145 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)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 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 8.2 μF / 400 Vdc
  • Mundorf, electrolytic capacitor, unetched, 15μF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47μF / 50 Vdc
  • 1.4 mm air core coil, 0.68 mH/0.23 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 115,00 excl. VAT: € 96.64 / $ 103.40

Kit with high-end crossover

The high-end kit comes with an Clarity Cap SA capacitor instead of an Audaphon MKP capacitor. Two electrolytical capacitors are replaced by foil capacitors. All inductances are baked varnished 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.

Kit with high-end-crossover without cabinet, price per speaker   EUR 149,00 excl. VAT: € 125.21 / $ 133.97

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 14,90 excl. VAT: € 12.52 / $ 13.40

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit:   EUR 4,20 excl. VAT: € 3.53 / $ 3.78
We recommend one board per kit (two boards for a speaker pair)

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