explain thiele small parameters?

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pcummings32

Copper - Posts: 52

Joined: August 02, 2009

Location: Illinois, United States

Posted: January 08, 2010 at 1:11 PM / IP Logged

i just need somebody to fully explain thiele small parameters to me. ive used the enclosure calculators as posted on the 12 volt but id like to better understand how the more in depth thiele small parameters work instead of just whats on this website.

haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: January 08, 2010 at 1:29 PM / IP Logged

Wikipedia has a fantastic description...

There's really no EASY way to describe them. They are the combination of electrical and mechanical parameters which can be used to predict the low frequency response of a driver within a given enclosure.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

pcummings32

Copper - Posts: 52

Joined: August 02, 2009

Location: Illinois, United States

Posted: January 08, 2010 at 1:39 PM / IP Logged

ive checked out the wikipedia page and im trying to learn but im pretty intimidated. do i actually need to use thiele smalls or can i get away with using the enclosure calculators on the12volt.com ?

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: January 08, 2010 at 1:42 PM / IP Logged

The calculators we have here are pretty close. I've been able to make them jibe pretty closely to my favorite calculator: JBL Speakershop.

You can take these as better than "a little" accurate.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

pcummings32

Copper - Posts: 52

Joined: August 02, 2009

Location: Illinois, United States

Posted: January 08, 2010 at 1:47 PM / IP Logged

THANKS SO MUCH!!! another question i have is if i have for instance 1 speaker that requires 1.3 cu. ft. ported, do i include the port air space in overall enclosure airspace or do i figure that in some other way?

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: January 08, 2010 at 1:50 PM / IP Logged

The recommended volume for ANY driver is always the net volume. You must add to that volume the displacement of the driver, bracing and vent.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

pcummings32

Copper - Posts: 52

Joined: August 02, 2009

Location: Illinois, United States

Posted: January 08, 2010 at 2:00 PM / IP Logged

okay so if i have plans to make for instance a 14 by 14 by 14 enclosure that is .5 inches thickness, which comes out to 1.27 cu. ft. , and im goin to put a slot port that is 13 wide by 1.5 tall, which needs to be 22.2 inches long, the i need to somehow figure in and add the extra port area on to the box before i build it correct?

is there any percentage ratio that i can use to figure this or does it differ depending on the box and port tuning?

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explain thiele small parameters?

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