SD Series


P-Audio SD21-1800EL 1800W 21" Low Frequency Driver

Click here to download the Datasheet (PDF)

The SD21-1800EL is a high output low frequency transducer. The 21 inch (533mm) diameter piston will produce extremely high sound pressure levels at very low frequencies and is ideal for high level deep bass and sub woofer response in both live sound and recorded music venues. The very large radiating area and high linear displacement insure extremely high acoustic power radiation at very low frequencies. The operating range is 30Hz to 200Hz. The transducer uses high energy ferrite magnetics to achieve a very high acoustic output to weight ratio.

The SD21-1800EL employs a very large 5 inch (127mm) diameter voice coil that provides an AES rated 1800 watts of continuous power handling and a full 7200 watts of peak rated power handling when sufficient amplifier headroom is available. It is recommended that the transducer be loaded into a properly designed vented enclosure and that active high pass filtering be employed if extremely high low frequency power input will be used. The SD21-1800EL utilizes P Audio's Auto Balanced Cooling (ABC) technology to not only improve transducer power handling and reliability but to also increase power compression performance by carefully balancing and directing airflow to critical areas.

The voice coil design is an inside/outside geometry with P Audio's precision flat wire technology to improve conversion efficiency and provide a very large cross-sectional area for superior cooling.

System linearity is achieved by employing magnetic flux demodulation devices in the structure to increase fidelity and sonic accuracy. The system suspension has been designed specifically for high linear displacement and extended low frequency response. The double spider design insures very high displacement and linear response while maintaining excellent control. The cone has been treated with a conformal coating designed to provide additional mechanical damping and moisture resistance.

The transducer chassis is a die cast aluminum design that insures a very high degree of structural integrity.