Mini-Monitor Advanced   Shelf speaker as in Hobby Hifi 6/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 400 x 200 x 300 mm
  • frequency range (-8dB): 33 - 40000 Hz
  • crossover frequency(s): 2500 Hz
  • speaker type: bass reflex

Mini-Monitor Advanced is a two way compact speaker.

Mini-Monitor Advanced is a bass-reflex cabinet loudspeaker with drivers of Visaton and SB Acoustics.

The kit is delivered with the following drivers:
- a SB Acoustics SB21RDC-C000-4 tweeter
- a Visaton AL 130 midrange / bass driver

The loudspeaker has been developed by Bernd Timmermanns.

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 as shown in the waterfall diagram is exemplary, free of any disturbing resonance. At 90 dB and 1 m, nonlinear distortions are below 1% almost everywhere above 200 Hz.

Our kit consists of

  • SB Acoustics tweeter SB21RDC-C000-4
  • Visaton woofer AL 130, 8 Ohm
  • 2x Bass reflex tube HP50, 50x145 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Visaton damping material, lambs wool, Bag
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 uF / 400 Vdc
  • Mundorf air core coil L140, 1.8 mH/0.43 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 202,00 excl. VAT: € 169.75 / $ 196.91

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 capacitor for the tweeter is of type polypropylen (MKP) Clarity-Cap CSA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 228,00 excl. VAT: € 191.60 / $ 222.25

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).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 16,05 excl. VAT: € 13.49 / $ 15.65

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 / $ 3.61
We recommend one board per kit (two boards for a speaker pair)


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