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If you feel confident in your ability to install this product without the assistance of a professional, please read this section thoroughly. We have provided a number of placement recommendations and installation tips to assist you. Keep in mind these are provided as a guideline and you may find that other placements specific to your vehicle may provide better results. • Make sure all moving parts and factory electrical wires are out of the way and will not interfere after installation. • Ensure the wire is of sufficient length to avoid pulling or stretching. This is even more important if the wires will be run under or through the factory interior. • Use electrical tape and wire ties to ensure all wires are properly secured. • Avoid installing speakers or electronics where they can be subject to moisture. • Ensure the speaker wires are connected using correct polarity. The positive polarity is marked by a (+) sign. Incorrectly connected subwoofers will result in limited bass output. • Speaker wire should be isolated from the vehicle’s electrical system to avoid noise being picked up by the amplifiers. • We recommend using 14 gauge or larger sized speaker wire to ensure your subwoofer receives the full power output of your amplifier. • Remember to listen responsibly and respect your ears. Being exposed to sounds over 125dB for even short periods of time can create permanent hearing loss! 5 SD12 GUIDELINES Enclosure Guidelines To work properly, the walls of your enclosure must be free from flexing during high sound pressure generated by your subwoofer(s). For best performance, always use MDF (Medium Density Fiberboard) or Baltic Birch Plywood to build your enclosure. We highly recommend that your wood be at least 3/4" in thickness. The enclosure should be sealed internally with silicon or glue and secured with screws every 4". Assemble the box before cutting the subwoofer hole(s). If the box will be mounted in a vehicle, it should be fastened securely using metal "L" shaped brackets. To build an enclosure, calculations will need to be made using the information found on the following 3 pages. Remember: • Use 3/4" MDF or Baltic Birch Plywood • Use silicon or glue in joints • Use screws every 4 inches We at Dual are diligent in checking the dimensions provided. The engineers, staff and installers provide this information to make your installation go as smoothly as possible. Errors do occasionally occur. We highly recommend that you personally measure your subwoofer prior to installation to avoid any damage. Please follow the rule “Measure twice, cut once". CAUTION 6 SD12 ENCLOSURE DIMENSIONS Sealed Enclosure Good Bass Performance Mini-Enclosure (Vb) Box Volume=.75 Cu. Ft. Example Dimensions: 14" W x 14" H x 11.5" D Better Bass Performance Small Enclosure (Vb) Box Volume=1.00 Cu. Ft. Example Dimensions: 15" W x 14" H x 13" D Best Bass Performance Medium Enclosure (Vb) Box Volume=1.25 Cu. Ft. Example Dimensions: 17" W x 15" H x 13" D Note: All specifications are subject to change without notice. Attention/Notice: Dimensions are external. 7 SD12 ENCLOSURE DIMENSIONS Vented Enclosure Good Bass Performance Mini-Enclosure (Vb) Box Volume=1 Cu. Ft. Example Dimensions: 14.25" W x 17" H x 12" D (P) Port=3" ID x 9.7" Long Better Bass Performance Small Enclosure (Vb) Box Volume=1.25 Cu. Ft. Example Dimensions: 14.50" W x 17" H x 14" D (P) Port=3" ID x 10.25" Long Best Bass Performance Medium Enclosure (Vb) Box Volume=1.5 Cu. Ft. Example Dimensions: 14" W x 20.25" H x 14" D (P) Port=3" ID x 11.75" Long Note: All specifications are subject to change without notice. Attention/Notice: Dimensions are external. 8 SD12 ENCLOSURE DIMENSIONS Bandpass Enclosure Good Bass Performance/Mini-Enclosure (Vf) Box Volume .84 Cu. Ft. (Vr) Box Volume .47 Cu. Ft. (P) Port 4" ID x 1.0" Long (Sb) Speaker baffle location/outside front: 9.25" Example Dimensions: 15" W x 16.5" H x 15" D Better Bass Performance/Small Enclosure (Vf) Box Volume .84 Cu. Ft. (Vr) Box Volume .69 Cu. Ft. (P) Port 4" ID x 2.625" Long (Sb) Speaker baffle location/outside front: 9.25" Example Dimensions: 15" W x 18.5" H x 15" D Best Bass Performance/Medium Enclosure (Vf) Box Volume .84 Cu. Ft. (Vr) Box Volume .91 Cu. Ft. (P) Port 4" ID x 4.25" Long (Sb) Speaker baffle location/outside front: 9.25" Example Dimensions: 15" W x 20.75" H x 15" D Note: All specifications are subject to change without notice. Attention/Notice: Dimensions are external. 9 SD12 WARRANTY Limited One-Year Warranty This warranty gives you specific legal rights. You may also have other rights which vary from state to state. Dual Electronics Corp. warrants this product to the original purchaser to be free from defects in material and workmanship for a period of one year from the date of the original purchase. Dual Electronics Corp. agrees, at our option, during the warranty period, to repair any defect in material or workmanship or to furnish an e...

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