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Port tuning help


Fennygolf

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So I build my encloser have 2 DC audio xl m1 15s the encloser is around 6.26 cubes and from the math I did which is probably wrong I put in 6 2inch long 1-1\2 diameter PVC pipes and I thought my tuning came out to 31-32hz but for some reason is only wanting to play from around 40hz and up can't figure out why anyone have any ideas or did I do my math wrong please help

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You have 1.5" diameter pvc ports? Even 6 of them is nowhere near enough port area

18 Sierra 6.2 Z71 : 3 F8L's, DD M2a @.67, 1.95@33

05 TL build log SOLD

04 YukonXL : jvc kw-v51bt , RE 6.5c, 4 jbl gt5 12s, Memphis pr1000.1 5.5 cu.ft. sealed

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What amp are you running?  How much port area you need is influenced by how much power you are running. 

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

Builds:

U7qkMTL.jpg  LgPgE9w.jpg  Od2G3u1.jpg  xMyLoO1.jpg  9pAlXUK.jpg

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14 hours ago, Fennygolf said:

im running 2 audiopipe apsm 1500s at 1ohm each

Ok, so lets figure 3,000 total watts max. 

On that amount of power one 10" diameter port would work very well.  

Or you could use three 6" ports, the single 10" would preferred though.  Two 8" ports would also work, but they are a bit bigger than you need and would have to be pretty long.

Or you could use a slot port of at least 85 sq in.  

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

Builds:

U7qkMTL.jpg  LgPgE9w.jpg  Od2G3u1.jpg  xMyLoO1.jpg  9pAlXUK.jpg

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3 hours ago, Fennygolf said:

okay how long would the 6inch ports have to be 

Are you going to have the ports inside the box or outside?  I ask because if you put the ports inside the box they are going to take up significant internal box space, which will affect the tuning frequency. 

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

Builds:

U7qkMTL.jpg  LgPgE9w.jpg  Od2G3u1.jpg  xMyLoO1.jpg  9pAlXUK.jpg

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