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The DALI ALTECO C-1 is truly a multipurpose speaker in both design and function. DALI wanted to ensure that the ALTECO C-1 is usable as both a height speaker as well as a traditional stereo speaker.By designing the crossover for stereo use and by keeping a strict focus on DALI sound design principles, we have created a speaker that fulfills both criteria. It is the perfect fit for adding height information to a surround setup or taking the role as an out-of-the-way stereo speaker.The ALTECO C-1 delivers believable height information from Atmos, DTS-X and Auro-3D movies in surround setup - not only when “firing up” using the ceiling as a reflector, but also “firing down” from a position up under the ceiling.The ALTECO C-1 is able to achieve this even without special equalizing in order to enhance the effects from HRTF (Head Related Transfer Function) technology. A technology found in Atmos certified speakers.Instead the ALTECO C-1 relies only on the height processing done in the amplifier, when selected. Had we included non-linear HRTF equalizing in the ALTECO C1, it would have been impossible to use it as a versatile neutral speaker, limiting the use to only an up-firing type speaker.Designed the way it is the DALI ALTECO C-1 offers the best from several worlds giving you ultimate flexibility and multiple applications. DUAL SOUND MODEThe unique angular design combined with the dual sound mode enables this speaker to be used in a multitude of different scenarios. Choose 'UP' on the front baffle switch to beam the sound waves either straight out for a soft downwards angle, or by selecting 'DOWN', beaming the sound almost straight down for close position listening.UP-FIRINGThe angular design of this speaker makes it perfect for up-firing use. Combined with a surround receiver that has the ability to render height information (Dolby Atmos, DTS-X or Auro-3D), placing it on top of the front speakers, and even on top of the rear speakers will offer an excellent ceiling reflected rendering of height information in compatible movies and concerts.WOOD FIBRE CONESOur low-loss drivers uses a mix of low-mass paper cones with wood fibre reinforcement. The embedded wood fibres give the surface an uneven structure, which dramatically minimizes the resonance of the surface. This creates the best possible reproduction of every detail in the audio signal.SOFT DOME TWEETERThe dome tweeter offers best-in-class resolution with an extended frequency response, wide dispersion and low coloration. A clear heritage from our high-end series. The tweeter is based on an ultra-lightweight weaved fabric, which weighs less than half of the market standard (0.056 mg/mm2). Specifications :Product seriesALTECOFrequency Range (+/-3 dB) [Hz]74 - 25,000 HzSensitivity (2,83 V/1 m) [dB]83.0 dBNominal Impedance [ohms]6 ohmsMaximum SPL [dB]103 dBRecommended Amplifier Power [W]40 - 100 WattCrossover Frequency [Hz]2,100 HzCrossover Principle2-wayHigh frequency driver, Quantity1 x 21 mmHigh frequency driver, Diaphragm typeSoft Textile Dome Low frequency driver, Quantity1 x 4.5"Low frequency driver, Diaphragm typeWood Fibre Cone Enclosure typeClosed Box Connection InputSingle Wire (Spring loaded push button) Recommended PlacementOn-Wall On speaker Recommended Distance From Wall [cm]    1 - 100 cmDimensions (HxWxD) [mm]265 x 160 x 200Weight [kg]2.9 kgAccessories IncludedRubber Feet Manual