Palu   Shelf speaker as in K+T 1/2021

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 86 dB
  • size (HxWxD): 340 x 200 x 300 mm
  • frequency range (-8dB): 45 - 31000 Hz
  • crossover frequency(s): 2100 Hz
  • speaker type: bass reflex

Palu is a two way compact speaker.

Palu is a bass-reflex cabinet loudspeaker with drivers of SB Acoustics and Wavecor.

The kit is delivered with the following drivers:
- a SB Acoustics SB26ADC-C000-4 tweeter
- a Wavecor WF152BD03 midrange / bass driver

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

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 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 0,5% above 300 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Wavecor Mid/Woofer WF152BD03, die cast, 4 Ohm
  • SB Acoustics aluminium dome tweeter SB26ADC-C000-4
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Bi-wiring Terminal T122 Ni with brass, nickel plated
  • 2m Speaker cable 2x1.5 mm2 black/red
  • Pan screws 3.5x17 black, torx, 8 pieces
  • 0,5x 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 2.2 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF; / 400 Vdc
  • 2x Audaphon MKT CAP 22 μF; / 160 Vdc
  • 1.3 mm air core coil, 1.2 mH/0.35 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • 0.7 mm air core coil, 1.5 mH/1.13 Ohm
  • Metal-oxide resistor, 10W 1.2 Ohm (brown-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 243,00 excl. VAT: € 204.20 / $ 245.04

For the Palu kit, feet with a height of at least 25 mm are also required, because the bass reflex opening is in the bottom.

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 SB Acoustics SB26ADC-C000-4 are of type polypropylen (MKP) ClarityCap CSA 250 V and 630 V.

  • ClarityCap PWA capacitor 2.2 μF; / 160 Vdc
  • 2x ClarityCap PWA capacitor 22 μF; / 160 Vdc
  • ClarityCap CSA capacitor 6.8 μF; / 630 Vdc
  • ClarityCap CSA capacitor 10 μF; / 250 Vdc
  • Mundorf baked varnish air core coil BL71, 0.27 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL71, 1.5 mH/1.13 Ohm
  • Mundorf baked varnish air core coil BL140, 1.2 mH/0.34 Ohm
  • Metal-oxide resistor, 10W 1.2 Ohm (brown-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 304,00 excl. VAT: € 255.46 / $ 306.55

Our Palu Low Cost kit consists of

  • Wavecor Mid/Woofer WF152BD03, die cast, 4 Ohm
  • SB Acoustics aluminium dome tweeter SB26ADC-C000-4
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Terminal T80AU (80 mm square)
  • 2m Speaker cable 2x1.5 mm2 black/red
  • Pan screws 3.5x17 black, torx, 8 pieces
  • 0,5x Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Audaphon MKT CAP 2.2 μF; / 160 Vdc
  • Audaphon MKT CAP 6.8 μF; / 160 Vdc
  • Audaphon MKT CAP 10 μF; / 160 Vdc
  • 2x JB, electrolytic capacitor, bipolar advanced, 22μF / 50 Vdc
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Audaphon M core coil M12, 1.2 mH/0.15 0hm
  • Mundorf ferrite core coil F50 1.5mH/1.07Ohm
  • Metal-oxide resistor, 10W 1.2 Ohm (brown-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 219,00 excl. VAT: € 184.03 / $ 220.84

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, 0.15 mH/0.28 Ohm
  • ceramic resistor 5.6 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 14,60 excl. VAT: € 12.27 / $ 14.72

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 / $ 4.74
We recommend one board per kit (2 boards per speaker pair)


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