RetroHiFi-PA 12/2R   Floorstanding as in Hobby Hifi 2-3/2025

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 950 x 450 x 350 mm
  • frequency range (-8dB): 38 - 20000 Hz
  • crossover frequency(s): 1800 Hz
  • speaker type: bass reflex

RetroHiFi-PA 12/2R is a two way floorstanding speaker.

RetroHiFi-PA 12/2R is a bass-reflex cabinet loudspeaker with drivers of Celestion and Visaton.

The kit is delivered with the following drivers:
- a Celestion CDX1-1747 + Celestion H1-9040P horn with driver
- a Visaton PAW 30 ND woofer

The loudspeaker has been developed by Bernd Timmermanns.

The frequency response of this speaker is perfectly linear.

The decay spectrum is nearly perfect.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Visaton woofer PAW 30 ND, 8 Ohm
  • Celestion H1-9040P Horn, Plastic, Bolt fastening
  • Celestion CDX1-1747, 1.75 inch-Kapton-Driver
  • PE sealing tape, 5x2 mm, 7.5 m
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 2x 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 MKP capacitor 2.7 μF / 250 V
  • Mundorf MKP capacitor 6.8 μF / 250 V
  • Audaphon MKT CAP 3.3 μF / 160 Vdc
  • 3x Audaphon MKT CAP 15 μF / 160 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 180 μF/63 Vdc
  • Mundorf air core coil L140, 0.33 mH/0.15 Ohm
  • 1.0 mm air core coil, 0.68 mH/0.39 Ohm
  • 2x 1.4 mm air core coil 1.5 mH/0.36 Ohm
  • 0.7 mm air core coil, 10 mH/3.85 Ohm
  • 0.7 mm air core coil, 22 mH/5.61 Ohm
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • 2x Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 692,00 excl. VAT: € 581.51 / $ 674.55

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 Celestion CDX1-1747 + Celestion H1-9040P are of type polypropylen (MKP) Mundorf MCAP EVO Öl 450 V.

  • Mundorf MCAP EVO Oil 2.7 μF / 450 V
  • Mundorf MCAP EVO Oil 6.8 μF / 450 V
  • Mundorf MKP capacitor 22 μF / 250 V
  • Mundorf MKP capacitor 3.3 μF / 400 V
  • 3x Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 180 μF/63 Vdc
  • Mundorf copper foil coil CFC14-0.68 mH/0.20Ohm
  • Mundorf Hepta Coil II45, 0.33 mH/0.22 Ohm
  • 2x Mundorf Hepta Coil II45, 1.5 mH/0.51 Ohm
  • Mundorf baked varnish air core coil BL71, 10 mH/3.62 Ohm
  • Mundorf baked varnish air core coil BL71, 22 mH/5.66 Ohm
  • MResist Supreme 6.8 Ohm / 20 Watt
  • Mresist Classic 2,7 Ohm / 10 Watt
  • 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)

Kit with high-end-crossover without cabinet, price per speaker   EUR 875,00 excl. VAT: € 735.29 / $ 852.94

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 47 μF / 160 Vdc
  • 0.7 mm air core coil, 0.22 mH/0.34 Ohm
  • ceramic resistor 22 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 21,22 excl. VAT: € 17.83 / $ 20.69

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 8.38
We recommend one board per kit (two boards for a speaker pair)


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