DayDream Signature 270   Shelf speaker as in Hobby Hifi 1/2025

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 700 x 400 x 350 mm
  • frequency range (-8dB): 32 - 30000 Hz
  • crossover frequency(s): 400, 2500 Hz
  • speaker type: bass reflex

DayDream Signature 270 is a three way compact speaker.

DayDream Signature 270 is a bass-reflex cabinet loudspeaker with drivers of Dayton Audio .

The kit is delivered with the following drivers:
- a Dayton Audio AMTHR-4 air motion transformer (ribbon-tweeter)
- a Dayton Audio SIG180-4 mids driver
- a Dayton Audio SIG270-4 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 2nd order low-pass filter (12 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 0,6% above 200 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Dayton Audio AMTHR-4
  • Dayton Audio SIG180-4
  • Dayton Audio SIG270-4
  • 2x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 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)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • 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.

  • Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKT CAP 1.5 μF / 160 Vdc
  • 2x Audaphon MKT CAP 3.9 μF / 160 Vdc
  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 150 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 470 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 22μF / 100 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 33μF / 100 Vdc
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 1.0 mm air core coil, 3.3 mH/1.05 Ohm
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Mundorf H core coil H71, 15 mH/1.15 0hm
  • Mundorf H core coil H100, 3.9 mH/0.3 0hm
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 5W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 540,00 excl. VAT: € 453.78 / $ 526.39

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 Dayton Audio AMTHR-4 are of type polypropylen (MKP) Clarity-Cap PX 250 V.

  • ClarityCap PX capacitor 3.9 μF / 250 Vdc
  • ClarityCap PX capacitor 10 μF / 250 Vdc
  • Audaphon MKP CAP Superior 1.5 μF / 400 Vdc
  • Audaphon MKP CAP Superior 3.9 μF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 150 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 470 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 33μF / 100 Vdc
  • Mundorf baked varnish air core coil BL71, 0.10 mH/0.23 Ohm
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf baked varnish air core coil BL71, 15 mH/4.45 Ohm
  • Mundorf baked varnish air core coil BL100, 1.0 mH/0.49 Ohm
  • Mundorf baked varnish air core coil BL100, 3.3 mH/1.05 Ohm
  • Mundorf H core Hepta Coil LH45, 3,9 mH/0.31 Ohm
  • Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 5W 15 Ohm (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 636,00 excl. VAT: € 534.45 / $ 619.97

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).

Price per impedance correction for one speaker, to be mounted on a small wooden board.     - not available (_)

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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