Variant Diamond   Shelf speaker as in K+T 6/2025

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 360 x 240 x 302 mm
  • frequency range (-8dB): 40 - 21000 Hz
  • crossover frequency(s): 1950 Hz
  • speaker type: bass reflex

Variant Diamond is a two way compact speaker.

Variant Diamond is a bass-reflex cabinet loudspeaker with drivers of Dayton Audio .

The kit is delivered with the following drivers:
- a Dayton Audio DC28F-8 tweeter
- a Dayton Audio DS 175-8 woofer

The loudspeaker has been developed by Thomas Schmidt.

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 0,3% above 300 Hz and doesn't exceed 0,5% at 95 dB at 1 m between 300 and 15000 Hz.

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

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • Dayton Audio DC28F-8
  • Dayton Audio DS 175-8
  • Bass reflex tube HP50, 50x143mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 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)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Jantzen Cross Cap MKP capacitor 8.2 μF / 400V
  • Jantzen Cross Cap MKP capacitor 10 μF / 400V
  • 1.0 mm air core coil, 3.0 mH/0.98 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 166,00 excl. VAT: € 139.50 / $ 161.82

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 Dayton Audio DC28F-8 are of type polypropylen (MKP) Clarity-Cap SA 630 V.

  • ClarityCap PWA capacitor 8.2 μF / 400 Vdc
  • ClarityCap SA capacitor 10 μF / 630 Vdc
  • Mundorf baked varnish air core coil BL71, 0.27 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL100, 3.0 mH/0.98 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 182,00 excl. VAT: € 152.94 / $ 177.41

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, 1.2 mH/1.08 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 21,00 excl. VAT: € 17.65 / $ 20.47

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 / $ 4.58
We recommend one board per kit (2 boards per speaker pair)


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