T-Desk 315   Shelf speaker as in Hobby Hifi 4/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 82,5 dB
  • size (HxWxD): 300 x 130 x 175 mm
  • frequency range (-8dB): 48 - 22000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

T-Desk 315 is a compact speaker with a fullrange driver.

T-Desk 315 is a bass-reflex cabinet loudspeaker with drivers of Tang Band.

The kit is delivered with a Tang Band W3-315 fullrange speaker

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of two RCL circuits in series to the fullrange driver.

The frequency response of this speaker is linear at 20 degrees off axis. The decay spectrum as shown in the waterfall diagram is free of any disturbing resonance. At a volume of 80 dB or 90 dB at 1 m, the nonlinear distortions are mostly lower than 1% above 300 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Tang Band W3-315 full range loudspeaker
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • 0,5x 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.

  • Mundorf, electrolytic capacitor, unetched, 1 uF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 8.2 uF / 70 Vdc
  • 1.0 mm air core coil, 0.10 mH/0.14 Ohm
  • 1.0 mm air core coil, 0.56 mH/0.36 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 47 Ohm (yellow-violet-black)

Kit without cabinet, price per speaker   EUR 57,00 excl. VAT: € 47.90 / $ 54.61

Kit with high-end crossover

The high-end kit comes with MKP capacitors for the fullrange driver. The inductances for the full range loudspeaker are 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.

Kit with high-end-crossover without cabinet, price per speaker   EUR 67,00 excl. VAT: € 56.30 / $ 64.18

Optionally high-pass filter for T-Desk 315

Our 110 Hz kit consists of

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

  • Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 2.7 Ohm (red-purple-gold)

Kit without cabinet, price per unit   EUR 9,74 excl. VAT: € 8.18 / $ 9.33

Our 110 Hz high-end kit consists of

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

  • Audaphon MKP CAP Superior 6.8 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 180 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 2.7 Ohm (red-purple-gold)

Kit without cabinet, price per unit   EUR 19,20 excl. VAT: € 16.13 / $ 18.39

Our 120 Hz kit consists of

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

  • Mundorf, electrolytic capacitor, etched, 180 uF/63 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 1.5 Ohm (brown-green-gold)

Kit without cabinet, price per unit   EUR 9,54 excl. VAT: € 8.02 / $ 9.14

Our 120 Hz high-end kit consists of

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

  • Audaphon MKP CAP Superior 6.8 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 22uF / 70 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 1.5 Ohm (brown-green-gold)

Kit without cabinet, price per unit   EUR 18,00 excl. VAT: € 15.13 / $ 17.24

Our 130 Hz kit consists of

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

  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)

Kit without cabinet, price per unit   EUR 9,34 excl. VAT: € 7.85 / $ 8.95

Our 130 Hz high-end kit consists of

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 100 uF/100 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47uF / 50 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)

Kit without cabinet, price per unit   EUR 17,15 excl. VAT: € 14.41 / $ 16.43

Our 140 Hz kit consists of

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

  • Mundorf, electrolytic capacitor, etched, 22 uF/100 Vdc
  • Mundorf, electrolytic capacitor, etched, 100 uF/100 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm

Kit without cabinet, price per unit   EUR 10,00 excl. VAT: € 8.40 / $ 9.58

Our 140 Hz high-end kit consists of

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

  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 82 uF/100 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf air core coil L50, 3.3 mH/3.13 0hm

Kit without cabinet, price per unit   EUR 16,90 excl. VAT: € 14.20 / $ 16.19

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 3,85 excl. VAT: € 3.24 / $ 3.69

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.. I-2765, price per unit:   EUR 3,70 excl. VAT: € 3.11 / $ 3.54
We recommend two boards per kit (four boards for a speaker pair)


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