Tuesday, November 13th, 2018

Focal Professional : “Listen to your music, not to your speakers”

By editorApril 30, 2012

TECHNOLOGY

These few words embody the philosophy of Focal-JMLab, the French manufacturer of acoustic loudspeakers and transducers.  From their very beginning on the drawing board in Research & Development, Focal Professional’s monitors are designed to deliver one thing, at any cost : the absolute acoustic truth.

Founded in 1979, Focal is today comprised of two geographically separated facilities.  The cabinet factory, in Bourbon-Lancy, ensures a custom-tailored production that favours manual labour for the most complex and precise work.  The second facility is Focal’s headquarters which are based in Saint-Etienne.  It combines the R&D laboratory, production and administrative departments on a 12,500m2 site, where more than two hundred people work on a common goal : the absolute finest sound.

Focal established itself as an innovation leader in the pursuit of a unique principle: total control of development and production.  This enables the company to constantly progress, while being sure there’s perfect control during the manufacturing process. Focal has registered many patents, such as the “W” composite sandwich cone or the pure Beryllium inverted dome tweeter.  These exclusive technologies have brought major progress to the professional audio world in terms of neutrality, definition and precision in reproduced sound.

Here’s what they had to say about the importance of loudspeaker cone design within the overall monitor loudspeaker design;

“It’s fundamental for a sound engineer to entirely trust what he or she hears, either in music production, postproduction or broadcast.  Our products are designed from the start to be professional tools that exactly reproduce the sound signal, without improving or damaging it. Focal Professional monitors guarantee the reproduction of all the micro-detail, the precise staging of instruments and voices, with no coloration or distortion.  These basic elements allow the engineer to directly access the source equipment and electronics and ensure optimum transfer quality onto public audio equipment.  Focal patented technologies are at the heart of our loudspeaker design philosophy and we are going to share some of this with you”

Pure Beryllium inverted dome tweeter

Pure Beryllium inverted dome tweeter

“The inverted dome tweeter – a Focal hallmark – is perhaps the perfect transducer. This design permits very high-efficiency, precision and energy.“The particular advantage of the inverted dome tweeter is the optimization of the mechanical coupling between the voice coil and the dome. The voice coil is fixed at mid-height on the dome and uniformly moves the cone entire surface.”

Classic 'Positive' Dome Design

 

“The positive dome is only joined at its edge, causing a bad mechanical coupling, as well as a lot of dome distortion from 16kHz.”

 

 

Inverted Dome Design

“The inverted dome directly radiates into the air, with maximum efficiency, which is translated by an extremely precise soundstage.  The dome’s response curve is clearly more linear than that of any positive dome.  It provides better space dispersion and very low directivity, contrary to ribbon tweeters.  The inverted dome tweeter offers unequalled dynamics, enabling sound engineers to very precisely control compression.  The image precision (height, width and depth) is outstanding and makes the positioning of each element very easy, as well as allows one to exactly assess the reverb tails.”

Comparative properties of Beryillium, Titanium and Aluminium

Due to its incredible rigidity, Beryllium represents the ultimate material for a tweeter dome. Focal, after two years of research and development, produced a world first: a pure Beryllium inverted dome, able to cover more than five octaves (1000Hz – 40kHz). You may ask yourself why do we strive for an extended response at 40kHz, if the human ear can only hear up to 20kHz? If you can extend frequency response, you will improve the perception of transients and other micro details. As well, the linearity of the speaker’s response curve is mainly a function of three opposite parameters: lightness, rigidity and damping. To this day, only one material permits a joining of these parameters: Beryllium. For domes with identical masses, Beryllium is seven times more rigid than Titanium or Aluminum, the latter two well known for their rigidity. This results in a sound wave propagation three times faster than Titanium and two and a half times faster than Aluminum. In the end, the linearity of the frequency response curve, the acoustic transparency and the impulse response of the Beryllium tweeter are maximized and offer near-perfect sound.“W” composite sandwich cone

“The “W” composite sandwich cone permits total optimization of the frequency response curve, thanks to the total control of three key parameters: lightness, rigidity and damping.  At Focal, the letter “W” means Glass/Glass, as it usually has two sheets of woven glass tissue that are “sandwiched” onto the structural foam core.  The glass tissue benefits from the incredibly fine weaving of very long fibres.  This choice offers a mass and a size clearly inferior to those in Aramid fibers or other Kevlar® fabrics, which generate coloration in the mid- range.

 

Focal SM9 Studio Monitor Loudspeaker

It’s also important to note that the molecular bond between the resin and the glass is greater than that obtained with Aramid fibres. The cone structure is more homogeneous and its behavior in flex is much more superior. These unique characteristics of lightness and rigidity provide control of the signal transmission speed inside the material. Adjusting the thickness of the structural foam allows a very precise control of the “W” cone’s damping. The variation of the number of glass fibre sheets and the thickness of the central foam can easily optimize the cone’s behaviour according to the desired frequency range. When listening, the sound of the “W” cone is entirely transparent, has an excellent phase response and has a very low distortion rate (rigidity 20 times higher than Kevlar® or Aramid fibre).”

 

Focal CMS 65 Studio Monitor Loudspeaker

Our thanks to Focal for sharing some of their development technology details with our readers.

You can review the entire Focal product line at www.focal.com

 

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