18N840

18" Neodymium ultra low Distortion Woofer

  • 95 dB Sensitivity 1 W / 1 m
  • 1.200 W Power Handling
  • 4″ Copper Sandwich Voice Coil for low Power Compression
  • Neodymium Magnet System
  • Double treated Cone for Water Protection
  • Triple Aluminum demodulating Rings for ultra low Distortion
  • Optimal for high Output Subwoofers
  • Light Weight Carbon Fiber Diaphragm

Specification

18N840 Specification

Application Subwoofer
Nominal Impendance: Ohm 8
Power handling AES noise: W 1200
Sensitivity (1 W / 1 m): dB 95
Frequency response: Hz 20 – 200
Voice Coil Diameter: mm 101.6 (4″)
Voice Coil Material: Cu
Voice Coil Winding Depth: mm 32
Magnet Gap Depth: mm 12
Basket: Cast Aluminum
Effect. diaphragm diameter D mm 393

Recommended reflex enclosure:
140 L / 35 Hz, BRD = 200 mm / 396 mm long

Thiele-Small

18N840 Thiele-Small Parameters

Resonance Frequency: Fs Hz 30.2
DC Resistance: Re Ohm 5
Mechanical Q Factor: Qms 6.3
Electrical Q Factor: Qes 0.4
Total Quality Factor: Qts 0.37
Equivalent Volume: Vas L 261
Moving Mass: Mms kg 0.222
Mechanical Complience: Cms mm / N 0.125
BL Factor: BL Tesla m 23
Effective Piston Area: Sd 0.1213
Max. linear Excursion: Xmax mm +/- 10
Voice Coil Inductance: Le1k mH 0.87
Le10k mH 0.51

Mounting & Drawing

18N840 Drawing

 

 

18N840

Mounting Information

Overall Diameter: mm 458
Mounting Holes Diameter: mm 8 x 8.5
Bolt Circle Diameter: mm 440
Baffle cut-out Diameter: mm 414
Overall depth: mm 237
Net Weight: kg 9.8

Curves

18N840 Curves

Frequency Response measured 1000 W (89.4 V)
at 1 m in a vented enclosure of 170 litre tuned 32 Hz incl. 2nd and 3rd harmonic distortion raised 10 dB.