Eighteensound 21NTLW5000 21inch Lautsprecher Chassis 8 Ohm

Eighteensound 21NTLW5000 21inch Lautsprecher Chassis 8 Ohm

ES21NTLW5000

• 96,5 dB SPL 1W / 1m average sensitivity
• Dual 115mm (4,5 in) Tetracoil Aluminum Voice coil
• 4000 W program power handling
• 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
• Suitable for vented, horn loaded and bandpass applications

The 21NTLW5000 is a 21 inch diameter next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration. For optimum results we recommend the usage of power amplifiers able to deliver 4000W program power without clipping.The 21NTLW5000 uses Eighteen Sound proprietary Tetracoil technology, where two different, axially separated magnetic gaps and two inside-outside 4.5" diameter aluminum 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 4.6" Tetracoil speaker is greater than 6". Consequently heat dissipation occurs over a larger surface area, driving AES power handling up to 1800 W.21NTLW5000 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.21NTLW5000 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.

Nominal Diameter	533 mm
Nominal Impedance	8 Ohm
Minimum Impedance	6,8 Ohm
Nominal Power Handling1	1800 W
Continuous Power Handling2	4000 W
Sensitivity3	97,0 dB
Frequency Range	30 - 1800 Hz
Voice Coil Diameter	115 mm
Magnet Material	Neo
Recommended Enclosure	200,0 dm3
Recommended Tuning	33 Hz
Resonance Frequency	31 Hz
Re	5,3 Ohm
Qes	0,38
Qms	5,2
Qts	0,36
Vas	270,0 dm3
Sd	1662,0 cm2
Xmax	17,5 mm
Mms	372,0 g
Bl	32,0 Txm
Le	1,6 mH
EBP	81 Hz
Overall Diameter	545 mm
Bolt Circle Diameter	520 mm
Baffle Cutout Diameter	492,0 mm
Depth	320 mm
Flange and Gasket Thickness	18 mm
Net Weight	12,5 kg
Shipping Weight	13,5 kg
Shipping Box	570x570x350 mm