Flat Pack 29/3   wall-mounted speaker as in Hobby Hifi 2/2021

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 84,5 dB
  • size (HxWxD): 1250 x 460 x 115 mm
  • frequency range (-8dB): 28 - 30000 Hz
  • crossover frequency(s): 200, 2100 Hz
  • speaker type: closed box
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Flat Pack 29/3 is a three way wall-mounted speaker of high quality.

Flat Pack 29/3 is a closed-cabinet loudspeaker with drivers of Mundorf, Wavecor and SB Acoustics.

The kit is delivered with the following drivers:
- a Mundorf AMT U110W1.1 air motion transformer (ribbon-tweeter)
- a Wavecor WF182CU13 midrange / bass driver
- a SB Acoustics SW26DBAC76-4 woofer

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 band pass consisting of a 3rd order high pass filter (18 dB per octave slope) and a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.
- a 2nd order low-pass filter (12 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 90 dB and 1 m, nonlinear distortions are below 0,3 % almost everywhere above 100 Hz.

Our kit consists of

  • Mundorf AMTU110W1.1
  • SB Acoustics shallow subwoofer SW26DBAC76-4, neodymium, black aluminium cone
  • WF182CU13, Wavecor Mid/Woofer, 8 Ohm, paper cone, BD, phase plug
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3,5m Speaker cable 2x2.5 mm2, transparent
  • 1,5x Pan screws 4x20 black, torx, 8 pieces
  • Allen wood screws, black, 5x30 mm, 8 pieces
  • Plan for DIY kit

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

  • Mundorf MCAP EVO Oil 6.8 μF / 450 V
  • 2x Audaphon MKP CAP Superior 3.3 μF / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • Electrolytic capacitor, etched 820 uF, 63Volt
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 470 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • 2x Mundorf, electrolytic capacitor, unetched, 68μF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 18 mH/4,66 Ohm
  • Mundorf baked varnish air core coil BL100, 0.47 mH/0.32 Ohm
  • Mundorf H core coil H100, 1.5 mH/0.17 0hm
  • Mundorf H core coil H100, 4.7 mH/0.34 0hm
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 972,00 excl. VAT: € 816.81 / $ 914.82

Kit with high-end crossover

The high-end kit is delivered with Mundorf Hepta coils and baked varnish air core coils 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 Mundorf AMT U110W1.1 are of type Mundorf EVO Silver Gold Oil.

  • 2x Mundorf MCAP EVO Oil 3.3 μF / 450 V
  • Mundorf MCAP EVO Oil 10 μF / 450 V
  • Mundorf Mcap Supreme EVO Silver Gold Oil 6,8 μF / 800V
  • Electrolytic capacitor, etched 820 uF, 63Volt
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 470 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • 2x Mundorf, electrolytic capacitor, unetched, 68μF / 50 Vdc
  • Mundorf Hepta Coil II45, 0.47 mH/0.27 Ohm
  • Mundorf Hepta Coil II45, 4.7 mH/1.16 Ohm
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 18 mH/4,66 Ohm
  • Mundorf H core Hepta Coil LH45, 1,5 mH/0.16 Ohm
  • MResist Supreme 6.8 Ohm / 20 Watt
  • Mresist Classic 1,0 Ohm / 10 Watt
  • Mresist Classic 4,7 Ohm / 10 Watt
  • Mresist Classic 5,6 Ohm / 10 Watt
  • Mresist Classic 15 Ohm / 10 Watt

Kit with high-end-crossover without cabinet, price per speaker   EUR 1304,00 excl. VAT: € 1095.80 / $ 1227.29

Kit with high-end crossover no.2, a proposal by Dr. Peter Strassacker

The high-end kit is delivered with copper foil coils and 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) ClarityCap CSA with 630 V.

  • ClarityCap CSA capacitor 6.8 μF / 630 Vdc
  • 2x ClarityCap ESA capacitor 3.3 μF / 250 Vdc
  • ClarityCap ESA capacitor 10 μF / 250 Vdc
  • 2x Audaphon MKT CAP 68 μF / 160 Vdc
  • Electrolytic capacitor, etched 820 uF, 63Volt
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 470 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • Mundorf copper foil coil CFC16-0.47 mH/0.22Ohm
  • Mundorf copper foil coil CFC14-1.5 mH/0.29Ohm
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • 0.7 mm air core coil, 18 mH/4,66 Ohm
  • Mundorf H core baked varnish coil BH100, 4.7 mH/0.34 0hm
  • MOX10-resistor 1.0 Ohm/10 Watt (brown-black-gold)
  • MOX10-resistor 4.7 Ohm/10 Watt (yellow-violet-gold)
  • MOX10-resistor 5.6 Ohm/10 Watt (green-blue-gold)
  • MOX10-resistor 6.8 Ohm/10 Watt (blue-grey-gold)
  • MOX10-resistor 15 Ohm/10 Watt (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1061,00 excl. VAT: € 891.60 / $ 998.59

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, unetched, 22μF / 70 Vdc
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • 4x Ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 20,90 excl. VAT: € 17.56 / $ 19.67

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 11,80 excl. VAT: € 9.92 / $ 11.11
We recommend one board per kit (2 boards per speaker pair)


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