Apertura Enigma mkII hi-end loudspeakers

DRIVE UNITS

• Two 22cm mid woofers, with « isotactic Matrix » cones – a new type of composite material (woven polypropylene). This cone material exhibits stiffness, lightness and good damping properties,
  Long voice-coil on titanium former for a high linear excursion. A heavy copper ring on the pole piece together with a solid copper phase plug reduce distortions.
  This custom design driver made by Seas in Norway for Apertura is widely modified in our facility (motor & mechanical damping).
• New generation ribbon tweeter that uses an aluminum/ polymer sandwich diaphragm for improved linearity.
  The high frequency drive unit is a professional grade ribbon tweeter, one of the biggest currently available. Its emissive surface is four times the Armonia one.
  A so high effective piston area allows to reduce the movements of the ribbon, thus distortion at low and high levels.

CROSSOVER

• Proprietary « DRIM » structure with a triple attenuation slopes and phase control over the entire bandwidth.
• A brand new crossover for this mkII version with two independent circuit boards for low-pass and High-pass sections.
  Choix de condensateurs très haut de gamme.
  Selection of very high end audio capacitors from Jantzen, Denmark.
• Each set of drive units (tweeter and mid/woofer) are individually measured and crossover values adjusted according to these sets measurements.
• Hand wiring on a 140 µm copper printed circuit board. Optimized crossover structure to avoid magnetic interference between components
• Binding post : pure copper with gold plating

ENCLOSURE

• This new model uses the Apertura very specific cabinet shape: two curved sides of different length and no parallel front and back panels.
• The complex load is a mix between a Bass-Reflex and an acoustic line. The vent tube of large section is located beneath the speaker.
• A massive metal base acts as a mechanical referential and helps reproduce with precision the most subtle details.
• Laminar structure based on multiple thin layers pressure molded.
  Such process creates breaking modes and limit propagation of vibrations.
  Final thicknesses vary from 28 to 44 mm.
• Internal multi-cavity framework to stiffen the structure and create very specific areas where damping materials can be applied
• No less than 10 horizontal and vertical thick bracing panels make up the skeleton on which all panels are mounted on
• Importance is given to damping treatment to cancel any standing waves. We are using 4 different types of dumping materials.
• Mechanical grounding: a central cone positioned on the axis of the center of gravity improved vibrations transfer to the floor. It optimized the dispersal of structure-borne noises