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speakers		 Drivers → Dirac XT Midi Fermat Descartes II Stra To Cauchy 2

Building Instruction             Fermat   Lab Results

Like all Alcone speakers the Fermat should reproduce music accurately. Therefore, the cabinet has to be carefully reinforced through braces.

Cabinet Building Instruction

Fermat
 
Two small wooden panels with four holes each should be fitted into the cabinet. This ensures that the air can flow freely, but still suppresses unwanted vibration.

The upper two thirds of the cabinet should be filled with damping material (green).

It is quite OK when the damping material is close to the bass driver. However, the damping fleece should be packed loosely to ensure that the air reaches the bass reflex tube unhindered.

The lower parts of the bass reflex tubes remain uncovered; otherwise, the sound will not leave the cabinet without disturbance.

The crossover may be placed either behind the upper or lower AC 8 HE. This ensures easy access.

It's also possible to place the cabinet on 6 cm high base that will then accommodate the crossover.

Both bass reflex tubes should be built-in without shortening.

The terminal should be attached on the rear side of the cabinet, i.e. behind the bass reflex tubes.

Crossover Building Instruction

Fermat
The Fermat was equipped with a 3 way crossover that could also be regarded as a 2 1/2 way, since both the bass driver and the midrange driver will work over their entire range.

To achieve the required high efficiency, it was necessary to cut-off the bass driver at a relatively high frequency; the AC 8 HE midrange driver alone cannot realise the 92 dB efficiency.

With the exception of the coil in the bass driver path, all capacitors are of high quality foil or air core type.

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