Celestion CF1840JD
8Ω
Low frequency
| Nominal diameter | 18″ / 457 mm |
| Resonance | 37 Hz |
| Q factor | 0.40 |
| Sensitivity | 93.9 dB |
| Linear excursion | ± 12.5 mm |
| Program Power | 2400 W |
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Specifications
- Sensitivity (1W, 1m, infinite baffle) SPL1W 93.9dB
- Frequency response 30 - 2500Hz
Thiele & Small parameters
- Resonance frequency (free air) fS 37Hz
- Mechanical quality factor QMS 4.37
- Electrical quality factor QES 0.44
- Total quality factor QTS 0.40
Large signal parameters
- Maximum linear excursion (one way) xmax 12.5mm
- Air volume displaced at xmax VD 1418cm³
- Power handling P 1200W
- Program power Pmax 2400W
Voice Coil
- Nominal impedance Z 8Ω
- DC resistance RE 5.3Ω
- Inductance (1kHz) LE 1.16mH
- VC Diameter 100mm
- Winding height HVC 30mm
- Winding material Round copper
- Former material Glass fibre
Magnet
- Force factor Bl 24.8N/A
- Motor constant Bl/√RE 10.8N/√W
- Air gap height HAG 10mm
- Weight 3.18kg
- Material Ferrite
Diaphragm
- Effective diameter 380mm
- Effective area SD 1134cm²
- Moving mass MMS 217g
- Moving mass (without air load) MMD 190g
- Material Kevlar loaded paper
Suspensions
- Stiffness KMS 11.1N/mm
- Compliance CMS 90µm/N
- Equivalent volume to the compliance VAS 155L
- Mechanical resistance RMS 11.6N·s/m
- Surround material Cloth-sealed
Dimensions
- Nominal diameter 18″
- 457mm
- Overall diameter 460mm
- Baffle cutout diameter 414mm
- Overall depth 220mm
- Volume occupied by the driver (estimated) 6.9L
- Net weight 11.6kg
- Frame material Cast aluminium
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