• Home
  • Brands
  • Dynatech

SD-18EL


The SD-18EL (Best Bass Speaker) is an very high output low frequency transducer. The 18 inch (460mm) 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 operating range is 30Hz to 200Hz. The transducer uses high energy neodymium magnetics to achieve a very high acoustic output to weight ratio.

The SD-18EL employs a large 5 inch (127mm) diameter voice coil that provides an AES rated 1800 watts of continuous power handling and a full 6800 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 suitable active high pass filtering be employed if extremely high power levels are expected at low frequencies. The SD-18EL utilizes Dynatech'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 Dynatech's square 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.

GENERAL SPECIFICATIONS

  Nominal diameter   460 mm/18 in
  Power rating   1800 W(AES)
  Nominal impedance    8Ω
  Sensitivity    98 dB
  Frequency range    30-1000 Hz
  Chassic type    Cast aluminum
  Magnet type    Ferrite
  Voice coil diameter   127 mm/5 in
  coil material   Copper
  Former material   Glass fiber
  Cone material   Paper
  Surround material   Cloth
  Suspension   Double
  X-max   11.05 mm
  Gap depth   12 mm/0.47 in
  Voice coil winding width   28 mm/1.1 in
  Net weight   18.5 kg/40.78 lb
  Shipping weight   19 kg/41.88 lb

FEATURES

  • Heavy-duty cast aluminium chassis for increased rigidity
  • Power compression only 1.6dB at rated power
  • A B/L in excess of 30 T/m
  • Double Suspension
  • Appropriate for applications as diverse as scoop bins, conventional reflex cabinets and horn loaded systems

SMALL SIGNAL PARAMETERS

  Re   5.22Ω
  Fs   33.15 Hz
  Mms   215.24 g
  Qms   15.42
  Qes   0.24
  Qts   0.24
  Vas   2.3.84 lt
  SD   1164.16 cm2
  BI   30.99 Tm
  Cms   107 μm/N
  Le (at 1kHz)   1.33 mH

SD-18EL


The SD-18EL is an very high output low frequency transducer. The 18 inch (460mm) 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 operating range is 30Hz to 200Hz. The transducer uses high energy neodymium magnetics to achieve a very high acoustic output to weight ratio.

The SD-18EL employs a large 5 inch (127mm) diameter voice coil that provides an AES rated 1800 watts of continuous power handling and a full 6800 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 suitable active high pass filtering be employed if extremely high power levels are expected at low frequencies. The SD-18EL utilizes P.Audios 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.Audios square 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.