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CLEARANCE Aurasound NS18-992-4A 18" Pro Subwoofer Driver 4 Ohm

AuraSound
Part #296-260

CLEARANCE Aurasound NS18-992-4A 18" Pro Subwoofer Driver 4 Ohm

AuraSound
Part #296-260  
Model: NS18-992-4A
Aurasound's NS18-992-4A 18" subwoofer is widely accepted as one of the best subwoofer drivers ever made. With an underhung voice coil, neodymium radial magnet, aluminum cone, and almost 2" of peak-to-peak excursion this driver is in a class of its own.
Key Features
  • Massive neodymium radial magnet assembly cuts weight without sacrificing performance
  • 4" aluminum voice coil with extensive venting handles 800 watts RMS with minimal distortion
  • Underhung voice coil design keeps more voice coil in the gap for minimum distortion
  • Capable of moving 2.9 liters of air without exceeding xmax
60 Day No Hassle Return Policy

Overview

Aurasound NS18-992-4A 18" Pro Subwoofer Driver 4 Ohm

Output, fidelity, and extension… Usually you have to sacrifice one in order to improve the other two. The 4 ohm 18" NS18-992-4A from Aurasound is one of the few drivers that can do it all.

Aurasound has designed the NS18-992-4A from the motor up. They started by combining a massive version of the patented Neo-Radial Technology (NRT) motor with an underhung 4" diameter high temperature voice coil to give this driver a particularly long stroke. Then, they mated the coil to an extremely rigid aluminum cone for minimum distortion. For suspension, this driver uses an injection molded rubber surround and dual opposed spiders to keep the cone and voice coil linear up to 3" of peak-to-peak mechanical excursion. To hold it all together Aurasound has developed a cast aluminum frame, which is remarkably solid while allowing maximum airflow for the back side of the cone and ample ventilation to keep the voice coil cool.

For moving excessive amounts of air while maintaining a hi-fidelity sound it will be hard, maybe impossible, to beat the Aurasound NS18-992-4A 18".

Product Details

BrandAuraSound
ModelNS18-992-4A
Part Number296-260
UPC848864022659
Unit of MeasureEach
Weight51

Product Specifications

Nominal Diameter18"
Bolt Circle Diameter17.5
Power Handling (RMS)800 Watts
Power Handling (MAX)1600 Watts
Impedance4Ω
Frequency Response20 to 1,500 HzHz
Sensitivity89dB 2.83V/1m
Voice Coil Diameter3.9"

Thiele-Small Parameters

Resonant Frequency (Fs)20Hz
DC Resistance (Re)3.1Ω
Mechanical Q (Qms)7.7
Electromagnetic Q (Qes)0.5
Total Q (Qts)0.47
Compliance Equivalent Volume (Vas)11.37ft³
Mechanical Compliance of Suspension (Cms)0.17mm/N
BL Product (BL)17.65T·m
Maximum Linear Excursion (Xmax)25mm
Surface Area of Cone (Sd)1164cm²

Materials of Construction

Cone MaterialAluminum
Surround MaterialRubber
Voice Coil Wire MaterialAluminum
Voice Coil FormerFiberglass
Basket / Frame MaterialCast Aluminum
Magnet MaterialNeodymium

Mounting Information

Overall Outside Diameter18.75"
Baffle Cutout Diameter16.8"
Depth12.25"
# Mounting Holes8

Parts Express Staff Recommended Enclosure Volume

Sealed Volume4.3ft³
Sealed F335Hz
Vented Volume8ft³
Vented F323Hz

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