Heka   wall-mounted speaker as in K+T 4/2022

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 850 x 450 x 130 mm
  • frequency range (-8dB): 40 - 40000 Hz
  • crossover frequency(s): 1600 Hz
  • speaker type: bass reflex
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Heka is a two way wall-mounted speaker.

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

The kit is delivered with the following drivers:
- a SB Acoustics SB29BAC-C000-4 tweeter
- two Wavecor WF152BD05 woofers

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 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 0,7% above 300 Hz and doesn't exceed 0,7% at 95 dB at 1 m between 300 and 15000 Hz.

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

"Close to or directly on the wall, the Heka shows an amazingly deep and solid bass foundation, which is even suitable for home cinema with moderate demands on the dynamics - I tried it: At "Independance Day”, which was shown again recently, I had it at one point or another still missing the "big stuff” in terms of subwoofers, but the Heka reproduces everything on this side of blockbuster cinema surprisingly well. And that applies above all to music, which it reproduces lively, authentically and very neutrally - a true dream loudspeaker for all people with little space and very high demands."

Conclusion of the magazine Klang+Ton:

The Heka is an uncompromising yet space-saving high-end solution for music and cinema fans alike.

Our kit consists of

  • SB Acoustics beryllium dome tweeter SB29BAC-C000-4
  • 2x Wavecor Mid/Woofer WF152BD05, die cast, 4 Ohm
  • 2x Bass reflex tube HP50, 50x143mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 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 black/red
  • Allen wood screws IS 4x16mm, black (MZF-8614), 8 pcs
  • 0,5x 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 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKP CAP Superior 22 μF / 400 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.3 mm air core coil, 2.2 mH/0.48 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Mundorf ferrite core coil P50 10 mH/3.49Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 752,00 excl. VAT: € 631.93 / $ 631.93

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 SB Acoustics SB29BAC-C000-4 are of type polypropylen (MKP) Mundorf MCAP EVO Silver Gold Oil 450 V.

  • Mundorf MCAP EVO Oil 1 μF / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 8.2 μF / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 22 μF / 450 V
  • Mundorf MKP capacitor 10 μF / 250 V
  • Mundorf MKP capacitor 15 μF / 400 V
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL140, 2.2 mH/0.46 Ohm
  • Mundorf ferrite core coil P50 10 mH/3.49Ohm
  • Mresist Classic 3,3 Ohm / 10 Watt
  • Mresist Classic 15 Ohm / 10 Watt

Kit with high-end-crossover without cabinet, price per speaker   EUR 1039,00 excl. VAT: € 873.11 / $ 873.11

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 22 μF / 160 Vdc
  • 0.7 mm air core coil, 1.2 mH/1.08 Ohm
  • ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 18,00 excl. VAT: € 15.13 / $ 15.13

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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