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<blockquote data-quote="ObTechAudio" data-source="post: 8277965" data-attributes="member: 660912">Hey guys,I am needing some direction or reassurance in what I&#039;m doing with my port. This is my first time working with an 18&quot; sub and with SoundQubed equipment. According to soundqubed.com, the HDC3 18&quot; wants a box anywhere from 5-6 cubes @ 31hz and a vent 96sq&quot; x 18&quot; long. To me, that port seems odd.So I just got done designing my box. External dimensions are 25&quot; x 25&quot; x 26&quot; but I&#039;m using double sheets of .75 MDF, so each measurement take off 3&quot;. I calculate internal space at 22&quot; x 22&quot; x 23&quot; = 11,132 inches = 6.44 cubes. Rough internal space after ONLY sub displacements is 6.4ish cubes. My desired tuning frequency is 31-32hz. So, I designed my port on both WinISD and CarStereo.com at 3&quot; x 16&quot; and 15.5&quot; long.Both WinISD and CarStereo said with that size of box (6.3 cubes internal), port size (3 x 16 x 15.5), and tuning frequency (31hz), I should have zero problem. After all displacements, I&#039;ll roughly have an internal space of 5.95 cubes, which is EXACTLY what I wanted. I&#039;m asking you guys, because it&#039;s not what soundqubed suggests and that&#039;s what worries me. I want you guys to check out what I&#039;m doing and see if it all looks good to go. I appreciate any insight or feedback.</blockquote>

[QUOTE="ObTechAudio, post: 8277965, member: 660912"] Hey guys, I am needing some direction or reassurance in what I'm doing with my port. This is my first time working with an 18" sub and with SoundQubed equipment. According to soundqubed.com, the HDC3 18" wants a box anywhere from 5-6 cubes @ 31hz and a vent 96sq" x 18" long. To me, that port seems odd. So I just got done designing my box. External dimensions are 25" x 25" x 26" but I'm using double sheets of .75 MDF, so each measurement take off 3". I calculate internal space at 22" x 22" x 23" = 11,132 inches = 6.44 cubes. Rough internal space after ONLY sub displacements is 6.4ish cubes. My desired tuning frequency is 31-32hz. So, I designed my port on both WinISD and CarStereo.com at 3" x 16" and 15.5" long. Both WinISD and CarStereo said with that size of box (6.3 cubes internal), port size (3 x 16 x 15.5), and tuning frequency (31hz), I should have zero problem. After all displacements, I'll roughly have an internal space of 5.95 cubes, which is EXACTLY what I wanted. I'm asking you guys, because it's not what soundqubed suggests and that's what worries me. I want you guys to check out what I'm doing and see if it all looks good to go. I appreciate any insight or feedback. [/QUOTE]

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