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Enclosure Design & Construction
Custom Box for Truck; Size constraints - Help & Tips needed
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<blockquote data-quote="Doxquzme" data-source="post: 8867738" data-attributes="member: 689267"><p>When you measure both the coils wired in parallel, +/+ and -/- then to the MM, they will read 2 ohms. If you check each coil, +/- to the MM, as one individual coil, they are going to read 4 ohms. If you're using a MM, then it will read DC resistance and be slightly lower, like 1.8 in parallel and 3.7 for each individual coil, or something close to that.</p><p></p><p>As for his box, he is a good 35% too large. it might be okay but generally, with a sub like these, like to be within 10-20% of the manufactures recommendations.</p><p></p><p>[ATTACH=full]55868[/ATTACH]</p><p></p><p>The air in a sealed enclosure acts like a cars spring and shock in one, and helps the woofer control movement in line with the design parameters. Going to large (like double or triple the recommended size) reduces the airs mechanical ability to control that movement and can result in damage to the woofer. Kind of like putting 40" gumbo mudders on a stock truck suspension and not changing the springs or shocks, they (like the air in the enclosure) becomes ineffective at controlling the movement it is there to help with. I don't think that is a huge concern here but it will reduce the effective power use of the woofer. The larger over that 1 cu ft, the more the impact it will have (negatively) respective off that differential.</p><p></p><p>As for wiring the two in a dual chambered sealed box, you can drill a hole between the chambers and run a wire to both and out to one terminal (a little dab of glue will do ya) or run dual terminals on the outside of the box and wire them together after the fact, what ever suits your fancy!</p><p></p><p>AS for either the sealed or the ported, the wiring in either instance is the same:</p><p></p><p>[ATTACH=full]55872[/ATTACH]</p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8867738, member: 689267"] When you measure both the coils wired in parallel, +/+ and -/- then to the MM, they will read 2 ohms. If you check each coil, +/- to the MM, as one individual coil, they are going to read 4 ohms. If you're using a MM, then it will read DC resistance and be slightly lower, like 1.8 in parallel and 3.7 for each individual coil, or something close to that. As for his box, he is a good 35% too large. it might be okay but generally, with a sub like these, like to be within 10-20% of the manufactures recommendations. [ATTACH type="full" alt="1704325218464.png"]55868[/ATTACH] The air in a sealed enclosure acts like a cars spring and shock in one, and helps the woofer control movement in line with the design parameters. Going to large (like double or triple the recommended size) reduces the airs mechanical ability to control that movement and can result in damage to the woofer. Kind of like putting 40" gumbo mudders on a stock truck suspension and not changing the springs or shocks, they (like the air in the enclosure) becomes ineffective at controlling the movement it is there to help with. I don't think that is a huge concern here but it will reduce the effective power use of the woofer. The larger over that 1 cu ft, the more the impact it will have (negatively) respective off that differential. As for wiring the two in a dual chambered sealed box, you can drill a hole between the chambers and run a wire to both and out to one terminal (a little dab of glue will do ya) or run dual terminals on the outside of the box and wire them together after the fact, what ever suits your fancy! AS for either the sealed or the ported, the wiring in either instance is the same: [ATTACH type="full" width="575px"]55872[/ATTACH] [/QUOTE]
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Custom Box for Truck; Size constraints - Help & Tips needed
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