100 mm (4 in) Tetracoil dual voice coil, equivalent to a single coil diameter larger than 152 mm (> 6 in)
Ultra linear suspension behavior for excellent sound clarity
Symmetric flux density and inductance behaviour
Low noise forced air cooling design
Water repellent cone and epoxy coated plates for outdoor use
Suitable for vented, horn loaded and bandpass subwoofer design
The 18TLW3000 is an 18 inch diameter high performance subwoofer, specifically designed for high SPL subwoofer applications in either a reflex, bandpass or horn loaded configuration. For optimum results we recommend the usage of power amplifiers able to deliver 3600W program power without clipping
18TLW3000 uses Eighteen Sound proprietary Tetracoil technology, where two different, axially separated magnetic gaps and two inside-outside 4" diameter voice coils are wound on the same former and suspended evenly in the two magnetic gaps.
The Tetracoil design key advantages are:
1) a symmetric flux density versus displacement behavior, that minimizes the even distortion products;
2) a very symmetric and flat inductance curve;
3) the equivalent voice coil diameter of a 4" Tetracoil speaker is greater than 6". Consequently heat dissipation occurs over a larger surface area, driving AES power handling up to 1800 W.
18TLW3000 design features include a large displacement suspension system which, in conjunction with a fiberglass reinforced, straight ribbed cone allows an ultra-linear piston action and provides full mechanical control across the entire working range.
In order to furtherly increase power handling and reduce power compression figure, a low density material air diffractor is placed into the backplate venting hole acting as a cooling system, increasing power handling capability and lowering the power compression figure.
18TLW3000 is able to perform properly under inclement weather conditions: the exclusive cone treatment improves pulp strength and gives water repellent properties to both sides of the membrane. In addition, magnetic structure metal plates coating is far more resistant than standard zinc coating to the corrosive effects of salts and oxidization.
Mounting and Shipping Info
Nominal Diameter460 mm ( in)
Nominal Impedance4 Ω
Minimum Impedance3.0 Ω
Nominal Power Handling11800 W
Continuous Power Handling23600 W
Frequency Range30 - 2000 Hz
Voice Coil Diameter100 mm (4.0 in)
Recommended Enclosure180.0 dm3 (6.36 ft3)
Recommended Tuning35 Hz
Resonance Frequency32 Hz
Vas185.0 dm3 (6.53 ft3)
Sd1225.0 cm2 (189.88 in2)
Overall Diameter462 mm (18.19 in)
Bolt Circle Diameter438 mm (17.24 in)
Baffle Cutout Diameter416.0 mm (16.38 in)
Depth275 mm (10.83 in)
Flange and Gasket Thickness24 mm (0.94 in)
Net Weight13.2 kg (29.1 lb)
Shipping Weight14.6 kg (32.19 lb)
Shipping Box482 x 482 x 257 mm (18.98x18.98x10.12 in)
2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated minimum impedance. Loudspeaker in free air.
Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.