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- Extended Pole Piece with Aluminum Shorting Ring
- Hi-Roll Foam EROM Surround
- Kevlar Reinforced Nonpress Pulp Cone
- 4.0″ BASV 4-Layer Flat Aluminium Voice Coil
- Quad Layer Deep Bass, High Excursion Spider System
- Triple Stack High-Grade Ferrite Magnets, 381oz
- Back Plate Voice Coil Gap Venting
818d: 1000w to 2000w – 18 Inch Power Tuned Subwoofer
| Speaker Size (In): | 18 |
| Watts RMS: | 1000 – 3000 |
| Watts Peak: | 6000 |
| Impedance: | D1 / D2 |
| VCD (In): | 4 |
| Piston Diameter (In): | |
| Fs (Hz): | 29 |
| Qms: | 4.606 |
| Qes: | 0.579 |
| Qts: | 0.514 |
| Vas: | 101 |
| dBSPL: | |
| Xmech (IN): | |
| Xmax (MM): | 29 |
| Frame OD (In): | |
| Frame OD w/Gasket (In): | 18 1/2 |
| Mounting Diameter (In): | 16 39/94 |
| Mounting Depth (In): | 11 11/32 |
| Motor Diameter (In): | 9 19/64 |
| Motor Depth (In): | 4 17/32 |
| Magnet Weight (Oz): | |
| Woofer Displacement (CuFt): | |
| Ported Enclosure (CuFt): | 5.0 – 6.0 |

TRF SW1845 D0.5 Subwoofer Αυτοκινήτου 18'' 4500Watt RMS (Τεμάχιο)
TRF SPL SW1830 D1 Subwoofer Αυτοκινήτου 18'' 3000Watt RMS (Τεμάχιο) 

















