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Thread: Port tuning??? |
    
TopJimmyJumps Unregistered guest |
| Posted on Sunday, December 12, 2004 - 08:25 pm: |
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I have a JL Audio sub (10w3v2). I built a ported enclosure per the JL audio documentation dimensions. Along with the dimensions it says "Recommended Port Tuning: 33.7 Hz"
What is this referring to, and how do I go about "setting" this value, if that's what I'm supposed to do. Is it something on my JL Audio amp?
If nobody knows, that's okay, I'll call JL tech support on Monday, but would like to keep going on this tonight while I'm on a roll.
Thanks in advance. |
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TopJimmyJumps Unregistered guest |
| Posted on Monday, December 13, 2004 - 12:08 am: |
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Looks like nobody knows? Bah. Okay. Thanks anyway, I'll call JL in the morning. |
Silver Member Username: Fryguy
Nova Scotia
Canada
Post Number: 404
Registered: Jun-04
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| Posted on Monday, December 13, 2004 - 12:26 am: |
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Port tuning is simply selecting a proper sized port for the speaker enclosure and speaker. The port can increase output at a certain frequency in a similar way to blowing across the opening of a bottle makes a noise at a certain pitch (It’s a basic explanation, no flames about this theory please). Change the volume inside the port by increasing the diameter or length and the frequency goes down. You'll need to calculate it for your own custom box and speaker to get the best outcome. |
TopJimmyJumps Unregistered guest |
| Posted on Monday, December 13, 2004 - 02:49 am: |
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Thanks. So, when they said that port tuning was at 33.7hz on the blueprints for the suggested ported box (in the sub docs), they meant...
"If you build this box exactly with these dimensions, the port is already tuned at 33.7hz, meaning you'll get an increase at the response/volume for that frequency."
Here's the document that I'm referring to.
http://www.jlaudio.com/subwoofers/pdfs/10W3v2_MAN.pdf
Notice the section where they spec a ported box dimensions. I have built that box. If I understand you correctly, I need not do anything or set anything on my sub's amp related to this. If I'm wrong, let me know.
Is that a correct translation? |
Silver Member Username: Fryguy
Nova Scotia
Canada
Post Number: 416
Registered: Jun-04
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| Posted on Monday, December 13, 2004 - 03:02 am: |
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That document is for a slot port box so if you built it to the specs in the document your fine. They already did the math for the proper box size for that speaker, so you should be in good shape. |
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