DigiBox 87FE Shelf speaker as in Hobby Hifi 5/2014

Technical data

impedance: 8 Ohm
sensivity (2,83V/1m): 85 dB
size (HxWxD): 242 x 150 x 190 mm
frequency range (-8dB): 60 - 20000 Hz
crossover frequency(s): Hz
speaker type: bass reflex

DigiBox 87FE is designed by Bernd Timmermanns. It contains a fullrange speaker Visaton SL 87FE. It feels at home in a bass reflex cabinet.

Our kit consists of

Visaton SL87 FE, 8 Ohm
Bass reflex tube HP35, 35x123mm, black
0,25x Damping Sonofil 100 x 35 cm for 20 litres
Female banana jacks, red and black
1m Speaker cable 2x0.75 mm2, transparent
0,5x Pan screws 4x20 black, cross recess, 8 pieces
Plan for DIY kit

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

Jantzen Cross Cap MKP capacitor 6.8 μF / 400V
Audaphon MKT CAP 1.5 μF / 160 Vdc
Mundorf, electrolytic capacitor, unetched, 5.6 μF / 70 Vdc
Mundorf air core coil L50, 4.7 mH/3.777 Ohm
1.0 mm air core coil, 0.12 mH/0.15 Ohm
1.0 mm air core coil, 0.47 mH/0.32 Ohm
Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)
Metal-oxide resistor, 5W 10 Ohm (brown-black-black)
Metal-oxide resistor, 5W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker EUR 72,00 excl. VAT: € 60.50 / $ 70.18

Kit with high-end crossover

The kit with high-end crossover contains Audaphon foil capacitors with polypropylen foil. In series to the loudspeaker Mundorf baked varnish coils are used.

Mundorf MKP capacitor 6.8 μF / 400 V
Audaphon MKP CAP Superior 1.5 μF / 400 Vdc
Audaphon MKP CAP Superior 5.6 μF / 400 Vdc
Mundorf baked varnish air core coil BL100, 0.12 mH/0.15 Ohm
Mundorf air core coil L50, 4.7 mH/3.777 Ohm
Mundorf H core baked varnish coil BH71, 0,47 mH/0.20 0hm
Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)
Metal-oxide resistor, 5W 10 Ohm (brown-black-black)
Metal-oxide resistor, 5W 15 Ohm (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker EUR 82,00 excl. VAT: € 68.91 / $ 79.93

price-performance kit

The following kit contains only one wave trap curcuit in the crossover. In addition it contais an inexpensive spring loaded terminal.

JB, electrolytic capacitor, bipolar advanced, 6.8 μF / 50 Vdc
1.0 mm air core coil, 0.47 mH/0.32 Ohm
Metal-oxide resistor, 5W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker EUR 35,00 excl. VAT: € 29.41 / $ 34.12

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, 15uF / 70 Vdc
Metal-oxide resistor, 10W 12 Ohm 2% (brown-red-black)

Price per impedance correction for one speaker, to be mounted on a small wooden board. EUR 7,40

excl. VAT: € 6.22 / $ 7.21

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. str-RA160, price per unit: EUR 5,90 excl. VAT: € 4.96 / $ 5.75
We recommend one board per kit (two boards for a speaker pair)

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