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<blockquote data-quote="tommyk90" data-source="post: 2721829" data-attributes="member: 545293"><p>Sorry that I didn't see this thread earlier.</p><p></p><p>the 26" rule is for non-trunk 2 seat cars such as a CRX or a ford EXP. It's basically in place to make the SPL classes a more level playing field. CRX's are notorious for having an advantage in the lanes because in any other organization they are allowed to build all the way up to the b-pillar.</p><p></p><p>Anyways, what that rule stipulates is that your sub enclosure cannot extend 26" from the back panel if you want to compete in a street class. If you run in a modified class then you don't have to follow this rule.</p><p></p><p>And yes, you do not have to run a fuse 18" from the amp if you are a non-member or do not need/want to qualify for points or state records.</p><p></p><p>12. For non-members and members who are not qualifying: If the system does not have in-line fusing, then the total of on-board fuses will be</p><p></p><p>used in the “Pressure Class” Formula. If the amplifi er(s) do not have on-board fuses, then one-half (1/2) the amplifi er’s Maximum CEA 2006</p><p></p><p>rating will be used in order to determine class assignment. If that rating is not available, then one-half (1/2) the maximum peak rating will be</p><p></p><p>used. If that is not available, then one-half (1/2) the maximum published rating will be used. If that is not available, then one-half (1/2) the theoretical</p><p></p><p>rating will be used. The theoretical rating is determined by doubling the power when the resistance is halved. For example: the amp has</p><p></p><p>a rating of 500 watts at 4 ohms from the manufacturer and is 1 ohm stable with no rating, therefore, it has a theoretical rating of 2000 watts at 1</p><p></p><p>ohm and one-half (1/2) of that would be 1000. In these cases:</p><p></p><p>{(Total Woofer Amplifi er Power/2) + Total Sqare Inches of Woofer Cone Surface Area} = Pressure Class #</p></blockquote><p></p>
[QUOTE="tommyk90, post: 2721829, member: 545293"] Sorry that I didn't see this thread earlier. the 26" rule is for non-trunk 2 seat cars such as a CRX or a ford EXP. It's basically in place to make the SPL classes a more level playing field. CRX's are notorious for having an advantage in the lanes because in any other organization they are allowed to build all the way up to the b-pillar. Anyways, what that rule stipulates is that your sub enclosure cannot extend 26" from the back panel if you want to compete in a street class. If you run in a modified class then you don't have to follow this rule. And yes, you do not have to run a fuse 18" from the amp if you are a non-member or do not need/want to qualify for points or state records. 12. For non-members and members who are not qualifying: If the system does not have in-line fusing, then the total of on-board fuses will be used in the “Pressure Class” Formula. If the amplifi er(s) do not have on-board fuses, then one-half (1/2) the amplifi er’s Maximum CEA 2006 rating will be used in order to determine class assignment. If that rating is not available, then one-half (1/2) the maximum peak rating will be used. If that is not available, then one-half (1/2) the maximum published rating will be used. If that is not available, then one-half (1/2) the theoretical rating will be used. The theoretical rating is determined by doubling the power when the resistance is halved. For example: the amp has a rating of 500 watts at 4 ohms from the manufacturer and is 1 ohm stable with no rating, therefore, it has a theoretical rating of 2000 watts at 1 ohm and one-half (1/2) of that would be 1000. In these cases: {(Total Woofer Amplifi er Power/2) + Total Sqare Inches of Woofer Cone Surface Area} = Pressure Class # [/QUOTE]
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