818d - Designed & Engineered in the USA
Overview
Any DD Audio Product bearing the Marine Grade logo incorporates water resistant features enabling it to be used in applications where moderate exposure to moisture will not result in damage to the product.
Marine Grade products are not waterproof, and submersion or excessive moisture exposure may result in product failure. DD Audio Marine Grade products are not certified for saltwater environments.
Features
- 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
- Extended Pole Piece with Aluminum Shorting Ring
Specifications
- Driver Size 18"
- Watts RMS 1000- 3000
- Peak Power 6000
- VCD 4"
- Impedance D1 / D2
- Fs – Hz 29
- Qms 4.606
- Qes 0.579
- Qts 0.514
- Vas – liters 101
- dBSPL 87.9
- Xmax – mm 29
- Frame OD w/Gasket – in 470mm - 18-1/2
- Mounting Diameter – in 422mm - 16-39/94
- Mounting Depth – in 288mm - 11-11/32
- Motor Diameter – in 236mm - 9-19/64
- Motor Depth – in 115mm - 4-17/32
- Sealed Enclosure - cu ft N/A
- Ported Enclosure - cu ft 5 - 6
Documentation
