Celestion Launches New FTX Range of ‘Common Magnet Motor’ Coaxial Speakers and the CDX07-1075 1-inch Exit Ferrite Compression Driver

January 22 2015, 04:00
Celestion announced the introduction of its new FTX range of common magnet motor coaxial loudspeakers. Coaxial loudspeakers offer a full range frequency response in a single self-contained driver and by concentrically aligning low and high frequency drivers, coaxial loudspeakers act as a single source, often providing improvements in signal alignment and off-axis response when compared to a traditional two-way system. 

Celestion’s FTX range of cast aluminium, ferrite magnet coaxial loudspeakers are available in 12-inch (305mm), 8-inch (200mm) and 6.5-inch (165mm) chassis diameters. 

They feature fully combined LF and HF components that are powered by a ‘Common Magnet Motor’ Assembly (where the same magnet is used for both the LF and HF elements). This enables the voice coils and hence the acoustic centres of the two drivers to be brought closer together, delivering further improvements in signal coherence and time alignment, for a more natural sounding audio reproduction.

The use of a single magnet assembly also means lighter weight and a more compact profile, compared to more conventional dual motor designs.

Each of these models features a polyimide film HF diaphragm, enabling these devices to provide greater high frequency power handling. The next-generation Sound Castle™ soft clamping assembly decreases diaphragm stress for further reduced distortion and even greater reliability of performance.

Both HF and LF voice coils are edge wound using lightweight copper or copper clad aluminium. Not only does this increase barrel stiffness, it enables a closer coil wire packing density, leading to improved cooling and increased motor strength.

Additional features include demodulation rings that minimise the effects of power compression, as well as substantially reducing the harmonic and intermodulation distortion that is commonly associated with voice coil displacement. 

New CDX07-1075 drivers
Celestion also announced the launch of the CDX07-1075; a new ¾-inch exit, neodymium magnet compression driver. With a 0.75” copper clad aluminium voice coil driving a polyimide diaphragm, the device delivers 15Wrms power handling and 109dB sensitivity across a frequency range of 1500 to 18,000Hz. Recommended minimum crossover frequency (at 12dB/octave) is 2.5kHz. 

These compact and lightweight compression drivers have been engineered for close-coupling, so they can be used to deliver very coherent and controllable HF. According to Celestion Product Manager Ken Weller, “The 1075 compression driver is purpose-designed for very close packing of multiple units, making it an ideal HF solution for line arrays. It also brings together the best elements of technology used in our CDX range, extracting the maximum performance from a very compact device.”

Like other CDX compression drivers in the range, CDX07-1075 makes extensive use of Celestion’s industry-leading experience in Finite Element Analysis (FEA) to optimize magnetic and acoustic design, helping the device to achieve outstanding performance at a highly competitive price point.
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