Orpheus-TL 3.5   Floorstanding as in Hobby Hifi 2-3/2024

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 1540 x 450 x 633 mm
  • frequency range (-8dB): 14 - 40000 Hz
  • crossover frequency(s): 130, 500, 1700 Hz
  • speaker type: transmission line

Orpheus-TL 3.5 is a three way floorstanding speaker.

Orpheus-TL 3.5 is a transmission-line loudspeaker with drivers of Audaphon and Hobby-HiFi (SEAS).

The kit is delivered with the following drivers:
- a Audaphon APR 1.0 ribbon-tweeter
- a Hobby-HiFi 18MW12T mids driver
- a Hobby-HiFi 18MW12T midrange / bass driver
- a ScanSpeak 32W/4878T00 woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,3% above 100 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Audaphon Aluminium Ribbon Tweeter APR 1.0
  • 2x Hobby-HiFi woofer 18MW12T, produced by SEAS
  • ScanSpeak Woofer 32W/4878T00
  • 3x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 1,5x Damping 30 1100 x 470 mm, adhesive
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 8x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28 I, gold plated (one pair, red and black)
  • 4m Speaker cable 2x4.0 mm2, transparent
  • Allen wood screws, black, 5x30 mm, 8 pieces
  • 2,5x Allen wood screws, black, 4x25 mm, 8 pieces
  • Plan for DIY kit

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

  • Mundorf MCAP EVO Oil 5.6 μF / 450 V
  • Mundorf MCAP EVO Oil 10 μF / 450 V
  • 2x Mundorf MKP capacitor 68 μF / 250 V
  • Audaphon MKP CAP Superior 0.68 μF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 12 μF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 330 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • 3x 0.7 mm air core coil, 0.47 mH/0.57 Ohm
  • 0.7 mm air core coil, 1.8 mH/1.15 Ohm
  • 0.7 mm air core coil, 6.8 mH/2.68 Ohm
  • 0.7 mm air core coil, 8.2 mH/3.05 Ohm
  • 0.7 mm air core coil, 10 mH/3.85 Ohm
  • 0.7 mm air core coil, 27 mH/6.44 Ohm
  • Mundorf H core coil H140, 2.2 mH/0.14 0hm
  • Mundorf H core coil H140, 6.8 mH/0.33 0hm
  • Mresist Classic 5,6 Ohm / 10 Watt
  • Mresist Classic 8,2 Ohm / 10 Watt
  • Metal-oxide resistor, 10W 0.68 Ohm 5% (blue-grey-silver)
  • 2x Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 1.5 Ohm (brown-green-gold)
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • 2x Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 2745,00 excl. VAT: € 2306.72 / $ 2491.26

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 Audaphon APR 1.0 are of type polypropylen (MKP) Mundorf Mcap Supreme EVO Öl 800 V.

  • Mundorf MCAP EVO 12 μF / 450 V
  • Mundorf MCAP EVO 330 μF / 250 V
  • 2x Mundorf MCAP EVO Oil 68 μF / 350 V
  • Mundorf Mcap Supreme EVO Oil 5,6 μF / 800V
  • Mundorf Mcap Supreme EVO Oil 10 μF / 800V
  • Audaphon MKP CAP Superior 0.68 μF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • Mundorf copper foil coil CFC14-0.47 mH/0.15Ohm
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • 3x Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL71, 1.8 mH/1.22 Ohm
  • Mundorf baked varnish air core coil BL71, 6.8 mH/2.68 Ohm
  • Mundorf baked varnish air core coil BL71, 8.2 mH/3.05 Ohm
  • Mundorf baked varnish air core coil BL71, 10 mH/3.62 Ohm
  • Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • Mundorf bs180 core coil 2.2 mH/0.10 Ohm
  • Mundorf bs180 core coil 6.8 mH/0.21 Ohm
  • Mresist ultra 5,6 Ohm, 3/30Watt
  • Mresist ultra 8,2 Ohm, 3/30Watt
  • 2x Mresist Ultra cooling rod 6,5K/W + Accessories (Set 1)
  • Metal-oxide resistor, 10W 0.68 Ohm 5% (blue-grey-silver)
  • 2x Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 1.5 Ohm (brown-green-gold)
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • 2x Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 3309,00 excl. VAT: € 2780.67 / $ 3003.13

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 68 μF / 160 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 23,50 excl. VAT: € 19.75 / $ 21.33

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 / $ 7.81
We recommend one board per kit (two boards for a speaker pair)


Home   Hobby HiFi Overview