Apertura Enigma Mk II

ENIGMA mkII is Apertura new 2 ways flagship model.

This new version, called mkII, is based on the same configuration as the original ENIGMA, with two 22cm woofers and a very big ribbon tweeter. All the other elements and the crossover have been redesigned in order to achieve the best performance ever.

The load has been optimized with a special care on mechanical and electromagnetic damping of every drivers.

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.

• One standard finish available :

  • High Gloss : american walnut, rosewood, piano black, white cream (RAL 9010)
    
    

• Frequency range : 30-30 000Hz/ +-3dB

• Sensitivity : 95dB/2,83v/1m

• Impedance : 4Ω

• Load : Bass-Reflex

• Drive units : 2 x 22 cm Isotactic Matrix cone Mid-Woofer, 15 x 145 cm ribbon tweeter

• Crossover frequency : 1,8kHz, “DRIM structure” : 2 separate circuit boards for high and low frequencies

• Terminals : single wire binding posts (bananas or spades)

• Dimensions :  254 x 406 x 1270 mm (W x D x H), with metal stands : 404 x 443 x 1346 mm

• Weight : 76 kg net – 95 kg shipping weight