The tweeter is a new generation of 1″ compression driver with ring radiator technology. The 38mm Mylar diaphragm used in the pressure chamber driver is driven by a particularly strong neodymium magnet, which guides the voice coil with a magnetic force of 2.3 Tesla. The result is a driver that guarantees highest resolution and ultra-fast reproduction.
The extended reproduction of the highest frequencies gives the rest of tonal range that special quality. With a linear transmission of more than 28,000 Hz, the Semper covers a frequency range that is significantly extended beyond all human hearing thereby maintaining perfect phase and time characteristics. This accurate reproduction of the uppermost frequency spectrum allows a lifelike reproduction of the overtone range. The overtone range is crucial for the differentiation of instruments. Thus, unlike other loudspeakers, the Semper makes it possible to differentiate between a Stradivari and a Guarneri violin. These qualities are supported and significantly enhanced by the use of the ODEON AUDIO birch multiplex horn. The 21.5 cm measuring horn acts as a mechanical amplifier which relieves the tweeter and thus contributes decisively to a relaxed sound character with the highest possible resolution.

The Semper is the middle of three new ODEON AUDIO three-way speakers. The new cabinet design provides an improved phase and time characteristics compared to the previous models, since all drivers are exactly on one axis. The Semper’s two-part cabinets are made of a material mix of plywood and a special medium density fiberboard (MDF). The cabinet materials used are decisive factors for the tonal characteristics of low and mid-range reproduction: plywood as a laminated wood is particularly rigid with its many cross-glued individual veneer sheets and therefore very low in resonance, so that discoloration effects are minimized. Our master craftsmen only use MDF with a particularly high proportion of wood fibers and binding agents, which are compressed under high pressure. The MDF used in the ODEON AUDIO models is thus up to 1.8 times heavier than conventional MDF and thus much more stable. This makes it particularly suitable for sophisticated loudspeaker concepts.
The asymmetrical bass cabinet is made in a sandwich construction of multiplex and MDF and effectively prevents standing waves. This means that less damping material is needed to maintain maximum efficiency.

The Semper uses a particularly pure oxidation-free copper cabling (OFC) from German production. In the high-frequency range, a thin, solid core cable with Teflon insulation and optimized cross- section is used. The high-purity 7N copper is drawn in a single crystal structure and enables the problem-free transmission of peak tone information, thus contributing to an extraordinarily lively and differentiated resolution.
To ensure trouble-free connection, Semper uses WBT Nextgen pure gold-plated copper loudspeaker terminals. Due to their design and low material usage, they suppress eddy current effects that usually occur in plug connections. The WBT terminals are mounted on acrylic plates which accommodate the crossovers and thus connect terminals and crossovers directly with each other. Unlike the frequently used metal, acrylic as a selected carrier material, has no negative influence on the sonic properties of the crossover components. Metallic carriers promote eddy current effects and generate electromagnetic fields that strongly affect the function of the components.