Innovation - Membranes

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. Kompund CGF

Crédit photo: .Kartesian company
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CGF is 10 times more rigid than conventional carbon fibre

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Speaker cone engineering is looking for utopia target: light as the air, and infinitely rigid. With very light and rigid cones cone break-up appears due to lake of damping. In another hand, the cones using additional damping treatment are heavy, which limits the speaker efficiency, the upper band extension and transient response. In order to keep the best of both worlds, we have developed a hybrid cone material made of Carbon and Glass fibers. Our CGF cone is 10 more rigid than conventional Carbon cone, and its inner damping is 2 times more efficient. The added mass is only +3% which is negligible considering the advantages provided. On these sonogram, we compare the same 5" woofer using different cone material. (Left: Ceramic | Right: Carbon) (Left: Paper | Right: CGF) Ceramic is fast, but most of the energy is focused around 10kHz Carbone is a good choice, but the cone break-up located at 5.5kHz isn't convenient for crossover Paper has very intense break-up at 5kHz, with lagging. It provides the typical sound coloration of paper cone CGF has a much more homogeneous energy from 200Hz to 8kHz, without specific break-up. Notes For this comparison, all the parts of the speakers remains unchanged, only the cone is different. We choose cones from the best cone vendors specialized in each technology





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. monoKore

Crédit photo: .Kartesian company
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.monoKore technology push the dome break-up over 25kHz

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Transmit accurately every single voice coil movement to the membrane is a fundamental condition for high fidelity reproduction. Use exotic and expensive material is useless if this preliminary condition isn't satisfied. For our high-end speaker range, we use direct coupling between the voice coil and the membrane. The mechanical energy doesn't go through variable glue point, it is transmitted through unique mechanical piece. Because mechanical lost means fidelity weakness, we prohibit it in our design. The frequency response below compare: - Twt25_vHE using monoKore technology (Blue) - Same tweeter but dome is glued on voice coil former as usual assembling (Red) We notice the frequency response is same until ~10kHz, but the upper band is affected by usual assembling. monoKore technology has much more linear response from 10kHz to 20kHe, and it avoids the typical dome break-up close to 20kHz ( as typical ceramic dome). Furthermore, we notice the monoKore has frequency response extension above 20kHz.





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. hexaKone

Crédit photo: .Kartesian company
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.hexaKone is lighter and 2 times more rigid than conventional paper cone

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For a small diameter loudspeaker (until 4inch), every single Gramm on the moving mass is important. With such a small active surface, if the moving mass is too heavy, the speaker efficiency go done significantly. In order to keep very low mass, Paper is very a interesting material. Nevertheless the lake of rigidity of the paper makes intense cone break-up in the midrange. This cone break-up is the source of sound coloration which could not be accepted by Kartesian quality expectation. To keep the benefit of a light paper cone, but avoid the cone break-up in the midrange, we have developed hexaKone technology. The idea is to emboss the back of the cone with geometric shape which increase the cone rigidity. On this frequency response we compare the same speaker with typical paper cone (red curve), and hexaKone (blue curve). We see the cone break-up of classic paper cone at 5.2kHz and 8.2kHz. On hexaKone, the cone break-up is above 10kHz, keeping very clean all the midrange, especially where human hear is sensitive. Note: For this comparison, we use the same 4" woofer, only the cone is different, all other parts remains unchanged.