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  • Specifications
  • Power Handling RMS / Music
    300W / 600W
  • Nominal Impedance   4 Ohm
  • Efficiency   92dB @ 1W @ 1m
  • Frequency Range
    32Hz - 28kHz @ -6dB
  • Frequency Range
    39Hz - 26kHz @ +/-2.5dB
  • Crossover Slope
    6dB/Oct.
  • Equalised
    Amplitude, Phase
  • Crossover Frequency   2.5kHz
  • Pair Matching better than
    +/-0.25 dB (L-R)
  • Bass Reflex Tuning   29.9Hz
  • Dimensions (H x W x D)
    1500 x 200 x 600mm
    with plinth / base plate (H x W x D)
    1660 x 280 x 630mm
  • Weight / Piece 90kg
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High-end loudspeaker Sigma 4

Sigma 4 is at the forefront of its series. "Its sound has unbelievable dynamics and density", so the experts say. It is detailed with plenty of weight and microdynamics at the same time. The tonal balance is natural and the sound is time-accurate. Sigma 4 builds virtual scenery truly and there is a great widespread space.

The above high-performance is achieved thanks to four unique midwoofers on the job in line array along with a single horn-loaded state of the art tweeter. Sigma 4 curved structure focuses the drivers' radiation at the sweet focal area, where there are listener's ears and minds.

Indeed, the listener has an opportunity to experience a genuinely masterly accomplishment of peace during the music session.

So they say:
"Sigma 4 exceed the big names in the loudspeaker world."
"That loudspeaker sounds like high-end and looks like high-end."

- Four state of the art SB ACOUSTICS Satori midwoofers
    -Proprietary cone material with EGYPTIAN PAPYRUS™ fibres made in-house
    -Powerful optimized low distortion neodymium motor system
    -Extended copper sleeve on pole piece for low inductance and reduced distortion
- State of the art SB ACOUSTICS Satori tweeter
    -Non-resonant diaphragm design for minimum high frequency break-up
    -Saturation controlled motor system with T-shaped pole piece for lower distortion
    -Dual copper caps for absolute minimum voice coil inductance and minimum phase shift
- Refined enclosure
    - Curved multilayer front panel so as to have sound within focus
    -Shallow tweeter horn for time coherence and reduced reflection of sound from box edges
    -Slim, deep and thoroughly reinforced box for undistorted deep and detailed bass
- Uncompromising crossover
    -High-class crossover linear components including tape cross-coil inductors, improved capacitors
    as well as pure silver ALBEDO internal speaker cables
    -Advanced and complex electronic circuit but the simplest and the shortest possible signal path
    -Refined crossover wiring diagram for natural timbre, time coherence and the highest possible speaker control
- Sigma as a whole
    -Elegant tall casing available in an appropriately selected range of finishes, e.g. colours of well recognized
     automotive brands
    -Reliable and tidy components so as to sound and look good

Sigma 4 is build like a luxury loudspeakeris

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