Port lengh

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bigmurf127

Member - Posts: 25

Joined: March 09, 2003

Location: United States

Posted: July 07, 2003 at 6:54 PM / IP Logged

I'm looking at this sub from Visonik the V1265S4

it asks for 2 four inch ports that are 19 inches long tuned at 33 herz. IS it me or is that really long.

I used a couple of online calcutators and they say 10" ports, confirmed by 3 calculators.

I don't want to build a box that deep, should i believe manufacturer specs or go with the standard equations

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bigmurf127

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Joined: March 09, 2003

Location: United States

Posted: July 08, 2003 at 11:31 AM / IP Logged

bump

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red_1

Member - Posts: 9

Joined: July 08, 2003

Location: United States

Posted: July 08, 2003 at 3:41 PM / IP Logged

I would go with the manufacturer specs because it will give you the best sound

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tdsteele

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Joined: February 22, 2003

Location: United States

Posted: July 08, 2003 at 4:11 PM / IP Logged

You can do different things to make it different, for instance, cut your port that length, then when it gets close to hitting the back of the box, cut it off and put a 90 on it. Or depending on the install, leave the excess port hanging out the front of the box. Just has to be the correct length one way or another. Could possible try converting it to a slot port and see what size that would make it.

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bigmurf127

Member - Posts: 25

Joined: March 09, 2003

Location: United States

Posted: July 08, 2003 at 9:35 PM / IP Logged

whats the formula to convert from round to a slotted port?

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bberman1

Gold - Posts: 2,314

Joined: March 11, 2002

Location: United States

Posted: July 09, 2003 at 9:15 AM / IP Logged

If you convert it to a square port you will still have the same port length. https://www.the12volt.com/installbay/forum_posts.asp?tid=14074&KW=square+port

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Port lengh

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