Allegra 2.0

The Allegra 2.0 is our flagship. It is designed around Anima and provided the inspiration to develop our CS products. To reach our performance goals for the Allegra 2.0, Joachim Gerhard chose to separate the midrange/tweeter cabinet from the bass cabinet. Not only did this technique allow Joachim to extend his design goal, but it increased the opportunities for Allen Perkins to implement mechanical noise reduction and resonance control. Optimization and isolation of the bass and midrange are a significant contributor to the Allegra 2.0's effortless performance.

In the midrange/tweeter cabinet, the Allegra 2.0 shares the same driver compliemnt as both Anima models. However, unlike the Anima, the Allegra 2.0 midrange driver is not required to reproduce low frequencies. The cabinet shape and internal volume is optimized to get the best performance with a sealed, rather than ported, box. When testing the Allegra 2.0, it became obvious that the combination of separated bamboo cabinets, and the mechanicall treatments Allen wasimplementing, resulted in a significantly quieter mechanical structure. The fruits of our labor surpass the dynamics and resolution of even the Anima CS while seamlessly incorporating suitably fast and articulate bass response from the bass cabinet.

The Allegra 2.0 midrange/tweeter cabinet is mass loaded with a hard coupled 3/4" stainless steel plate which forms the base of the cabinet. A mechanical decoupling system attaches this high mass assembly atop the bass cabinet. This decoupled mass approach significantly reduces the transfer of bass energy which would normally interfere with the midrange/tweeter performance. The midrange/tweeter crossover board is securely mounted to the stainless steel base and floats on decouplinng material inside the bass cabinet. This provides and extremely "quiet", vibration-free environment for the crossover and significantly aids in lowering the noise floor of the loudspeaker. For the Allegra 2.0, we have also upped the parts caliber (and cost), by using only the finest capacitors and custom-designed and built low-frequency inductors designed by Spiral Groove engineer Brian Daley.

The Driver Technology

The 1-inch tweeter is a combination metal and soft-dome transducer. Loudspeaker designers, audiophiles and reviewers have long debated the merits of metal versus soft-dome - metal can yield excellent transient response, clarity and high-frequency extension, whereas soft-dome tweeters are often considered to be smoother and "sweeter". The tweeter utilizes an extremely light and stiff aluminum-magnesium dome centered in a wide textile surround (most metal dome tweeters use aluminum, titanium or titanium-composite construction). The tweeter is distrotion-free far beyond the upper range of human hearing. Its large, supple surround allows increased output and lowers the cutoff frequency, which allows very low crossover points to be used.

The midrange cone is the same we use in the Anima and the Amerigo 2.0 models. The cone only begins to distort above 8kHz, well above its operating range in the Allegra 2.0. Designed for dynamic resolution, this drivers exceptional definition. The combined result is drastically reduced distortion and increased volume with more expressive dynamics.

The woofer cones in the Allegra 2.0 are ceramic-coated Duraluminum, which is very light and stiff, Incorporating two smaller diameter woofers allows higher output with lower distortion. The separate woofer crossover eliminates all cone resonances so there is no interference with the midrange frequencies. On a subjective level, the bass is highly delineated, with exceptional movement and penetrating power. The cabinet volume is large enough to provide frequencies below 30Hz.

Cabinet Technology

When investigating cabinet material, our goal was to find the ideal balance between beauty and performance. We were not satisfied with the thinly veneered Medium Density Fiberboard (MDF) even though it is relatively inexpensive and easily manufactured. Because MDF is heavy and flexible, the sound pressure generated internally by the drivers turns the entire cabinet into high distortion panels. Instead, we chose remarkable 3-ply, 3/4 inch thick, cross-core Mao Bamboo plywood. Our plywood incorporated multi-dimensional constrained layer damping construction, which results in a naturally quiet material for loudspeaker cabinet. Mao Bamboo, actually a grass, is an efficiently grown renewable resource that is naturally beautiful and elegant. With custom furniture grade craftmanship and one of our three finish treatments, there is a Canalis speaker to compliment any decor, from traditional to contemporary. We offer three finishes; Honey, Cinnamon, and Licorice.

Specifications

  • speaker type: 3-way, Two-Piece cabinet
  • woofer: dual Seas 8" Aluminum Cone woofer. Low mass aluminum voice coil for transient speed and long throw, 20mm cone travel
  • midrange: Seas 5" Aluminum Cone woofer. Low mass alluminum voice coil for transient speed and long throw, 20mm cone travel
  • tweeter: seas .75" High Definition aluminum/magnesium cone. Wide surround for extended low frequency linearity. Coil and windings are optimized for low compression at high power transient peaks
  • internal wiring: Proprietary Spiral Groove GrooveLine micro-litz wire for all audio signals. Single wire connection, Eichmann Bullet Plug Binding Posts
  • crossover: 18 dB Transitional filter. Linear phase, minimal group delay
  • impedance: 8 Ohms
  • efficiency: 88dB/1W/1m
  • power handling: 180W
  • frequency response: 36Hz - 33kHz (-3dB); Crossover Freq. 200Hz, 1.4kHz
  • dimensions: 107 x 25 x 27cm
  • weight: 40.8kg
  • color options: Honey, Cinnamon, or Licorice