Model 70-20 XR

This model is somewhat different from other models. The ribbon of 70-20XR is wider in comparison to the others, which is indicated by its label. Ribbon is 70mm long and 19mm wide. Housing is made out of 8mm thick steel. At the bottom of the chamber there is an adapter transformer, which is completely covered with resin. Net volume of the chamber in between the transformer and the magnet is reduced with wooden tiles to the required level and that space is very precisely filled with sound absorbing material. In this ribbon, the filling is made of finest medical cotton wool from pure cotton. The strong neodymium magnets are the same as those installed in all other models except for the 64-10.

The transformer in this model is special, also wound by hand and completely handmade. The primary is wound with a copper wire with a round section and high purity, while the secondary is being wound with copper foil of a 0,1mm thickness in three layers. The transformer is special because it has 3 outputs: 6,3 ohms, 9 ohms, and 12,6 ohms. In this way, the user can choose which sensitivity fits the best. The outputs of the transformer can have other values which can be chosen by the user himself on special request.

The next feature that sets this ribbon apart from the others is that the ribbon is made like a sandwich. It’s made out of two layers of aluminum foil with a thickness of 8 microns, which is ironed and stiffened by a very demanding process. In between the two layers of aluminum foil a special grease is extremely precisely measured and applied, which has the role of soothing the ribbon in an even shorter time after the impulse stops. This ribbon doesn’t have carrier foil made out of MYLAR, it’s in direct touch with air. This provides the smallest possible moving mass, several hundreds of times smaller than any classic DOME tweeter and far smaller than RIBBONS with a MYLAR carrier foil.

The result is shockingly rich, detailed, the sound image is unencumbered by any colorations.

The ribbon itself is fixated on the ends to the supporting frame via tensioners. After installation, the ribbon is being precisely tensioned in order to achieve optimal performance. In this model, the ribbon is the same length as in the 70-10 model. In all models, the first number indicates the effective length of the ribbon, and the second number indicates the width of the ribbon. Model 70-20 is user serviceable, which means that the user can replace the ribbon himself if necessary.

Like every other model, this one is characterized by exceptional openness, detail, spaciousness and depth of the sound image. The sound is fluffy, colorless, it will not hide or mask even the finest information read from the source.

Considering the ratio of length and width, it is not necessary to place the ribbon pad deflectors, like on models 70-10 and 140- 15.

The face plate is the same as in other models, it is it is laser-cut from stainless steel with a thickness of 2 mm, and finished with powder coating.

Model 70-20 can be used in two-way, three-way, four-way systems, near-field, mid-field, far-field studio monitors, for home theater systems as central to the D'apolito configuration.