Mikro-Horn 2011, Shelf speaker   as in Hobby HiFi 6/2010

 
Technical data
- impedance: 8 Ohm
- sensivity (2,83V/1m): 88 dB
- size (HxWxD): 440 x 188 x 370 mm
- frequency range (-8dB): 49 - 21000 Hz
- crossover frequency(s): Hz
- speaker type: Horn

Using the Micro Horn 2011 as an example Bernd Timmermanns wants to show how small a horn could be. As driver he chose the Fostex FE 103 full range.

The exaggeration of mid frequencies are corrected by a wave trap. Further corrections, like impedance linearization, are implemented by components in parallel to the driver.

An excerpt from the Hobby HiFi review

"For the listening test we placed the Micro Horns on stands of 60 cm height. The rear wall helped to somewhat reinforce the bass. We put on Scream Machine" by James Morrison, waiting for what was going to happen. Funky brass sections blended with plucked bass - that's a piece of cake for the Micro Horns. The diminutive radiators certainly rose to the challenge. The music arrived exactly where it was aimed at: the stomach. At the same time the speakers were quite capable of displaying different virtues. They staggered the brass section accurately, positioned the bass dead center and carefully avoided muddling the instruments.

Encouraged by this we played "Havana Cafe" by Paquito D'Rivera. This recording is less aggressive, but shows a larger instrumental variety. Here as well, the Micro Horns were in absolute control and carefully avoided producing a mush of sounds. Clearly, the Micro Horns show immense musical talented. Instrumental music is reproduced with lots of verve, convincing dynamics and, considering the Micro Horn's talent - an adequate power handling. At the same time they neatly differentiate between instruments and place them in traceable positions. "

Our kit consists of

  • Fostex FE 103EN, 4 inch, full range, 8 Ohm
  • Polyester damping material
  • 0.5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31 (a pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • 4 pcs Pan screws 4x20 black
  • Plan for DIY kit

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

  • Mundorf, electrolytic capacitor, etched, 4.7 uF/100 Vdc
  • Mundorf, electrolytic capacitor, etched, 68 uF/100 Vdc
  • Mundorf, electrolytic capacitor, unetched, 4.7 uF / 70 Vdc
  • 0.5 mm core coil 10 mH/3.48 Ohm
  • Mundorf H core coil H100, 6.8 mH/0.46 0hm
  • MOX4 resistor 6.8 Ohm/4 Watt (blue-grey-gold)
  • MOX4 resistor 10 Ohm/4 Watt (brown-black-black)
  • MOX10 resistor 15 Ohm/10Watt (brown-green-black)

Kit without cabinet, price per speaker EUR 134,00 excl. VAT: € 112.61 / $ 131.75
 

   

Kit with high-end crossover

In our high-end version all capacitors are replaced by better ones. In the signal path to the woofer the coil is replaced.

  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • electrolytic capacitor, unetched, 4.7 uF / 70 Vdc
  • electrolytic capacitor, unetched, 68uF / 50 Vdc
  • 0.5 mm core coil 10 mH/3.48 Ohm
  • Mundorf H100-Kernspule 6.8 mH
  • MOX4 resistor 6.8 Ohm/4 Watt (blue-grey-gold)
  • MOX4 resistor 10 Ohm/4 Watt (brown-black-black)
  • MOX10 resistor 15 Ohm/10Watt (brown-green-black)

Kit with high-end crossover without cabinet, price per speaker EUR 142,00 excl. VAT: € 119.33 / $ 139.61

Kit with high-end crossover 2

In our high-end version all capacitors are replaced by Foil capacitors.

  • 2 pcs MKP capacitor 4.7 uF / 400 Vdc
  • MKP capacitor 68 uF / 400V
  • 0,7 mm baked varnish air core coil, 10 mH/3.62 Ohm
  • DR coil 6.8 mH/0.285 Ohm (FEB068)
  • MOX4 resistor 6.8 Ohm/4 Watt (blue-grey-gold)
  • MOX4 resistor 10 Ohm/4 Watt (brown-black-black)
  • MOX10 resistor 15 Ohm/10Watt (brown-green-black)

Kit with high-end crossover without cabinet, price per speaker EUR 172,00 excl. VAT: € 144.54 / $ 169.11

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).

  • Mundorf, electrolytic capacitor, etched, 47 uF/100 Vdc
  • 0.7 mm air core coil 0.33 mH/0.48 Ohm
  • MOX10 resistor 12 Ohm/10Watt (brown-red-black)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 7,25 excl. VAT: € 6.09 / $ 7.13
 

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 / $ 3.64
We recommend one board per kit (two boards for a speaker pair)
 

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