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.   Product seriesALTECO HEIGHT SPEAKERS Frequency Range (+/-3 dB) [Hz] 74 - 26,000 Hz Sensitivity (2,83 V/1 m) [dB] 83.0 dB Nominal Impedance [ohms] 6 ohms Maximum SPL [dB] 103 dB Recommended Amplifier Power [W] 40 - 100 Watt Crossover Frequency [Hz] 2,100 Hz Crossover Principle 2-way High frequency driver, Quantity 1 x 21 mm High frequency driver, Diaphragm type Soft Textile Dome  Low frequency driver, Quantity 1 x 4.5" Low frequency driver, Diaphragm type Wood Fibre Cone  Enclosure type Closed Box  Connection Input Single Wire (Spring loaded push button)  Recommended Placement On-Wall On speaker  Recommended Distance From Wall [cm] 1 - 50 cm Dimensions (HxWxD) [mm] 190 x 160 x 255 Weight [kg] 2.8 kg Accessories Included Rubber Feet Manual