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GDx speaker column is built from modern, natural materials with stress being put on the highest possible sound quality. A broadband speaker from the Japan manufacturer Fostex has been used. Its frequency graph is perfectly matched with the instrumental, soft characteristics of tube amplifiers.

Because of the broad spectrum of frequencies transferred there is no need to use switches, therefore less electromagnetic noise is produced. Sidewalls are made of laminated, dimmed glass (17 mm thick). Exceptional dampening properties and relatively large mass of the glass enhance suppression of vibrations.