Daydream Center   Shelf speaker as in Hobby Hifi 1/2021

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 89 dB
  • size (HxWxD): 180 x 430 x 240 mm
  • frequency range (-8dB): 80 - 30000 Hz
  • crossover frequency(s): 500 Hz
  • speaker type: closed box

Daydream Center is a two way compact speaker.

Daydream Center is a closed-cabinet loudspeaker with drivers of TECTONIC and Dayton Audio.

The kit is delivered with the following drivers:
- a TECTONIC TEBM46C20N-4B full range driver
- two Dayton Audio RS150-4 woofers

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 full range driver.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum as shown in the waterfall diagram is exemplary, free of any disturbing resonance.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1,1% above 200 Hz.

Our kit consists of

  • 2x Dayton Audio RS150-4
  • Full-range TECTONIC TEBM46C20N-4B
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 3.5x17 black, torx, 8 pieces
  • 1,5x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Mundorf, electrolytic capacitor, etched, 56 uF/100 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33μF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47μF / 50 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • Mundorf Aronit core coil a100 3.3mH/0.64Ohm
  • Mundorf ferrite core coil F71 1.5mH/0.61Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit without cabinet, price per speaker   EUR 224,00 excl. VAT: € 188.24 / $ 210.82

The ring for the fullrange driver is not included in the kit.

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 TECTONIC TEBM46C20N-4B are Mundorf ELKO glatt + Mundorf EVO ÖL.

  • 2x Mundorf MCAP EVO Oil 1.5 μF; / 450 V
  • Mundorf, electrolytic capacitor, unetched, 33μF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47μF / 50 Vdc
  • Mundorf, electrolytic capacitor, unetched, 56μF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.10 mH/0.23 Ohm
  • Mundorf Aronit core coil ba100 3.3mH/0.64Ohm
  • Mundorf baked varnish ferrite core coil, BF71, 1.5 mH/0.61 Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 265,00 excl. VAT: € 222.69 / $ 249.41

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit:   EUR 4,20 excl. VAT: € 3.53 / $ 3.95
We recommend one board per kit (two boards for a speaker pair)


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