The 1,200-watt RMS CF1540HD has a stated 97 dB sensitivity (1W/1m) and a 4-inch inside/outside voice coil, wound on both sides of the former for improved heat dissipation, preventing sensitivity loss through thermal compression. Purpose-built for subwoofer applications, the CF1540HD has a phase-matched double suspension system for a more balanced and symmetrical performance throughout the entire excursion of the cone for distortion reduction. This driver also incorporates twin demodulation rings, employed to reduce harmonic and intermodulation distortion. Additionally, the CF1540HD utilizes Celestion’s Balanced Airflow Venting technology that’s designed to rapidly take heat away from the magnet assembly, cooling the motor system to counteract the effects of thermal compression more effectively. The CF drivers are also built with weather-resistant cones, enabling them to be used in outdoor systems.
Power rating: Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.
Continuous power rating: Defined as 3dB greater than the AES rating.
Sensitivity: Measured on axis at 1W, 1m in 2π anechoic environment.
Parameters: Measured after unit subjected to pre-conditioning signal.
Xmax: 0.5*(Hvc-Hg) + 0.25*Hg