Patented by Focal, the class H external amplifier in current mode marks a major technological advance. It offers the most transparent and natural amplification possible to drivers and guarantees perfect respect for the original audio signal. With the lowest level of total harmonic distortion (THD) ever measured in our anechoic chamber, this solution sets a new standard for sonic fidelity.
DIRECT CURRENT CONTROL
Why this choice? The force exerted on a membrane is determined by the equation: F ⃗=B ⃗*l*i, where B is the magnetic field in the coil, l the length of the coil and i the current intensity. Most amplifiers control voltage instead of current. However, the link between current and voltage is provided by the impedance of the transducer, which varies with temperature, frequency and the position of the coil inside the magnet.
Unlike voltage-mode amplifiers, which control the output voltage, a current-mode amplifier controls the current so is not dependent on impedance variations of the driver. Current-mode amplification also cancels out unwanted artefacts, reduces distortion and ensures a fast, accurate and faithful response. Analogue filtering also ensures maximum dynamic range.
ADVANCED FEATURES
The amplification features a number of adjustable functions.
• Volume control for each speaker, for perfect adaptation to the environment.
• Two PEQs (20Hz to 1kHz) for room acoustics, as well as a low-shelf and a high-shelf.
• Bass compensation in the case of a soffit installation and speaker adjustment in the case of a sealed port to adapt the speakers to their environment.
• Activation/deactivation of front LEDs and standby mode as required.
• Adjustable input sensitivity from +4dBu to +24dBu.
Focal products using this technology
Discover other Focal technologies
"M" profile Béryllium Tweeter
Rigidity and Purity
Patented by Focal, the pure beryllium ‘M’ profile tweeter combines rigidity, lightness and damping for exceptional high-frequency reproduction. The ‘M’ membrane is the result of many years of research and expertise. Made in a single piece, it improves sound dispersion, reduces distortion and ensures optimum power handling.
TNF Tweeter
Treble finesse
Made in France in our workshops, the TNF aluminum/magnesium inverted dome tweeter delivers smooth, clear treble. The surround that connects the dome to its support uses Poron, a shape-memory material. This surround is directly derived from Focal's famous Beryllium tweeter, and reduces distortion by a factor of three between 2000 Hz and 3000 Hz, the most sensitive zone for the ear. In addition, a waveguide has been developed to perfect spatialization and further improve the inverted dome's very low directionality. In the horizontal plane, the frequency response is within +/- 0.5 dB. This performance guarantees an incredibly stable soundstage.
Gamma Structure
An anti-vibration cabinet
As the surface area of a loudspeaker cabinet is greater than that of the loudspeaker diaphragms, it can radiate sounds that are distorted by the resonances of the cabinet structure. This alters reproduction and blurs the sound image. To prevent such "interference", it is essential that the cabinet is as inert as possible, that it is not emissive. At Focal, we use MDF (Medium Density Fiber) to achieve this inertia. This stable, heavy structure is anti-vibration. It has been optimized by vibratory mapping of the loudspeaker walls to reinforce or modify the structure wherever a weak point appeared.
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