Accutop   Shelf speaker as in K+T 5/2020

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 390 x 220 x 350 mm
  • frequency range (-8dB): 38 - 40000 Hz
  • crossover frequency(s): 1900 Hz
  • speaker type: passive radiator

Accutop is a two way compact speaker with fantastic sound characteristics. To call it a reference loudspeaker makes a mockery of its performance. Accutop is the best loudspeaker we know so far.

Accutop is a loudspeaker with drivers of Audaphon, Accuton and Wavecor. Passive radiators provide deep bass.

The kit is delivered with the following drivers:
- a Audaphon APR 1.0 ribbon-tweeter
- a Accuton C168-6-890 woofer with huge voice coil
- two large passive membranes on the back of the loudspeaker

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 first order low-pass filter (6 dB per octave slope) for the woofer.

The frequency response of this speaker is perfectly linear.

The decay spectrum as shown in the waterfall diagram is exemplary, free of any disturbing resonance.

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.

Our kit consists of

  • Accuton/Thiel C168-6-890 mids/woofer, 4D concept driver
  • Audaphon Aluminium Ribbon Tweeter APR 1.0
  • 2x Wavecor PR182BD02 Passive Radiator, die cast
  • 1,5x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Female banana jacks, red and black
  • 2m Speaker cable 2x1.5 mm2 black/red
  • 3x Allen wood screws, black, 4x25 mm, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 0.47 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 3.9 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF; / 400 Vdc
  • Audaphon MKT CAP 0.47 μF; / 160 Vdc
  • Audaphon MKT CAP 2.2 μF; / 160 Vdc
  • Audaphon MKT CAP 4.7 μF; / 160 Vdc
  • 1.3 mm air core coil, 1.8 mH/0.45 Ohm
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • 0.7 mm air core coil, 0.12 mH/0.29 Ohm
  • 0.7 mm air core coil, 0.22 mH/0.34 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 1575,00 excl. VAT: € 1357.76 / $ 1588.58

Price for a pair of custom speakers of any color   EUR 5715,00 excl. VAT: € 4926.72 / $ 5764.27

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 Audaphon APR 1.0 are of type polypropylen (MKP) Mundorf MCAP EVO Silber Gold Öl and Clarity Cap CSA.

  • Mundorf MCAP EVO Silver Gold Öl 3.9 μF; / 450 V
  • ClarityCap PWA capacitor 0.47 μF; / 160 Vdc
  • ClarityCap PWA capacitor 2.2 μF; / 160 Vdc
  • ClarityCap PWA capacitor 4.7 μF; / 160 Vdc
  • ClarityCap CSA capacitor 0.47μF / 630 Vdc
  • ClarityCap CSA capacitor 8.2 μF; / 250 Vdc
  • Mundorf copper foil coil CFC14-1.8mH/0.32Ohm
  • Mundorf baked varnish air core coil BL71, 0.10 mH/0.23 Ohm
  • Mundorf baked varnish air core coil BL71, 0.12 mH/0.25 Ohm
  • Mundorf baked varnish air core coil BL71, 0.22 mH/0.34 Ohm
  • Mundorf baked varnish air core coil BL71, 0.56 mH/0.64 Ohm
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1689,00 excl. VAT: € 1456.03 / $ 1703.56

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, 0.47 mH/0.50 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,57 excl. VAT: € 10.84 / $ 12.68

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,41 excl. VAT: € 9.84 / $ 11.51
We recommend one board per kit (2 boards per speaker pair)

Measurements

measurmentsMeasurements on this speaker

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