Orpheus-TL   Floorstanding as in Hobby Hifi 4-5/2023

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): 200, 1600 Hz
  • speaker type: transmission line

Orpheus-TL is a three way floorstanding speaker.

Orpheus-TL is a transmission-line loudspeaker with drivers of Audaphon, SEAS and Scan Speak.

The kit is delivered with the following drivers:
- a Audaphon NeoPro 5i ribbon-tweeter
- a Hobby-HiFi 18MW12T mids 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 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 is perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,33% above 100 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Audaphon ribbon NeoPro5i, aluminium, black
  • Hobby-HiFi woofer 18MW12T, produced by SEAS
  • ScanSpeak Woofer 32W/4878T00
  • 2x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 1,5x Damping 30 1100 x 470 mm, adhesive
  • PE sealing tape, 5x2 mm, 7.5 m
  • 9x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28 I Ni, nickel plated (one pair, red and black)
  • 4m Speaker cable 2x4.0 mm2, transparent
  • 1,5x Allen wood screws, black, 5x30 mm, 8 pieces
  • 1,5x 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
  • ClarityCap PWA capacitor 68 μF / 160 Vdc
  • Audaphon MKP CAP Superior 0.47 μF / 400 Vdc
  • Audaphon MKP CAP Superior 1.5 μF / 400 Vdc
  • Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 220 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • Mundorf air core coil L140, 1.5 mH/0.38 Ohm
  • 0.7 mm air core coil, 0.18 mH/0.36 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • 0.7 mm air core coil, 6.8 mH/2.68 Ohm
  • 0.7 mm air core coil, 27 mH/6.44 Ohm
  • Mundorf bs140 core coil 6.8 mH/0.3Ohm
  • Mresist Classic 6,8 Ohm / 10 Watt
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit without cabinet, price per speaker   EUR 2076,00 excl. VAT: € 1744.54 / $ 1884.10

Price for a pair of custom speakers of any color   - not available (_)

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 NeoPro 5i are of type polypropylen (MKP) Mundorf Mcap Supreme EVO Öl 800 V.

  • Mundorf MCAP EVO Oil 0.47 μF / 450 V
  • Mundorf MCAP EVO Oil 1.5 μF / 450 V
  • Mundorf MCAP EVO Oil 2.2 μF / 450 V
  • Mundorf MCAP EVO Oil 5.6 μF / 450 V
  • Mundorf MCAP EVO Oil 10 μF / 450 V
  • Mundorf MCAP EVO Oil 15 μF / 450 V
  • Mundorf MCAP EVO Oil 68 μF / 350 V
  • Mundorf MCAP EVO Oil 220 μF / 250 V
  • Mundorf Mcap Supreme EVO Oil 5,6 μF / 800V
  • Mundorf Mcap Supreme EVO Oil 10 μF / 800V
  • Mundorf, electrolytic capacitor, etched, 150 μF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 680 μF/63 Vdc
  • Mundorf baked varnish air core coil BL71, 0.18 mH/0.34 Ohm
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL71, 0.56 mH/0.64 Ohm
  • Mundorf baked varnish air core coil BL71, 6.8 mH/2.68 Ohm
  • Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • Vacuum impregnated: Mundorf air core coil L200, 1.5 mH/0.22 Ohm
  • Mundorf bs180 core coil 6.8 mH/0.21 Ohm
  • Mresist Classic 6,8 Ohm / 10 Watt
  • Mresist ultra 6,8 Ohm, 3/30Watt
  • Mresist Ultra cooling rod 6,5K/W + Accessories (Set 1)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 2524,00 excl. VAT: € 2121.01 / $ 2290.69

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 100 μF / 160 Vdc
  • ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 24,30 excl. VAT: € 20.42 / $ 22.05

universal PCB

For one speaker you need 1 pc. of RA240 and 1 pc. of RA160 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 / $ 5.35
Universal PCB RA240, order no.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 7.81
We recommend one board (each) per kit (two boards (each) for a speaker pair)


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