Yamuna   Shelf speaker as in K+T 5/2022

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 81 dB
  • size (HxWxD): 280 x 160 x 210 mm
  • frequency range (-8dB): 50 - 28000 Hz
  • crossover frequency(s): 2400 Hz
  • speaker type: bass reflex

Yamuna is a two way compact speaker.

Yamuna is a bass-reflex cabinet loudspeaker with drivers of Wavecor .

The kit is delivered with the following drivers:
- a Wavecor TW022WA10 tweeter
- a Wavecor WF118WA06 woofer

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

The crossover consists of:
- a 2nd order high-pass filter (12 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 nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1,1% above 200 Hz and doesn't exceed 2,1% at 95 dB at 1 m between 300 and 15000 Hz.

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

"In our large listening room, the Yamuna was able to assert itself convincingly as long as extreme levels were not demanded. Some bass really comes out of the small Cabinet, which lays a strong and contoured foundation as long as the volume stays within its limits. The mid-range is slightly pointed when listening, which makes a very pleasant and at the same time focused impression, especially with acoustic and voice-heavy music, like a good full-range speaker, which, however, has a very neutral and extensive high-frequency range here. Placed inside my record shelf as a test, the Yamuna is even more powerful in the basic tone and bass range due to the virtual baffle extension and sounds extremely pleasant with its really tasteful British tuning."

Conclusion of the magazine Klang+Ton:

"Very high-quality mini speaker, finely tuned in terms of sound."

Our kit consists of

  • Wavecor silk dome tweeter TW022WA10
  • Wavecor Mid/Woofer WF118WA06 glass fiber, 8 Ohm
  • 2x Bass reflex tube HP50, 50x143mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Binding Post PK28 I Ni, nickel plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2 black/red
  • 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 3.3 μF / 400 Vdc
  • 2x Audaphon MKT CAP 10 μF / 160 Vdc
  • 1.0 mm air core coil, 1.2 mH/0.54 Ohm
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • Mundorf ferrite core coil P50 3.3 mH/1.71Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)
  • Metal-oxide resistor, 10W 22 Ohm (red-red-black)

Kit without cabinet, price per speaker   EUR 285,00 excl. VAT: € 239.50 / $ 239.50

Price for a pair of custom speakers of any color   - not available (_)

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 Wavecor TW022WA10 are of type polypropylen (MKP) Mundorf MCAP EVO Silber Gold 450 V.

  • Mundorf MCAP EVO Silver Gold Öl 3.3 μF / 450 V
  • 2x Mundorf MKP capacitor 10 μF / 250 V
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL100, 1.2 mH/0.54 Ohm
  • Mundorf ferrite core coil P50 3.3 mH/1.71Ohm
  • Mresist Classic 8,2 Ohm / 10 Watt
  • Mresist Classic 15 Ohm / 10 Watt
  • Mresist Classic 22 Ohm / 10 Watt

Kit with high-end-crossover without cabinet, price per speaker   EUR 374,00 excl. VAT: € 314.29 / $ 314.29

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 10 μF / 160 Vdc
  • 0.7 mm air core coil, 0.82 mH/0.89 Ohm
  • ceramic resistor 12 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 13,80 excl. VAT: € 11.60 / $ 11.60

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 / $ 3.95
We recommend one board per kit (2 boards per speaker pair)


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