Anyone Use Qtc In Enclosure Calculations

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IronCy

Copper - Posts: 93

Joined: February 16, 2003

Posted: August 27, 2003 at 8:25 AM / IP Logged

Hey I was wondering if anyone takes Qtc into consideration when calculating enclosure volume....I understand that the lower the Qtc, the more volume required......ideal is .707, average is .8-1. Just wondering if anyone concerns themselves with this.

Thanks

-Cy

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: August 27, 2003 at 12:27 PM / IP Logged

Qtc is relevant when designing acoustic suspension (sealed) enclosures. This page explains it a lot better than I could. Cheers!

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IronCy

Copper - Posts: 93

Joined: February 16, 2003

Posted: August 27, 2003 at 12:58 PM / IP Logged

i understand what Qtc is, I was just wondering if anyone else takes it into consideration, and what Qtc value they use when calculating sealed enclosure volume.

-Cy

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wizzle

Copper - Posts: 55

Joined: August 08, 2003

Location: Afghanistan

Posted: August 28, 2003 at 2:10 AM / IP Logged

do you know what kind of response curve you are going for? it is not used in the actual design of the box, but rather the design of the sound you are going for. we use it here, but not on every box.t some of the other shops i worked for in the past use it all the time. by the way .707 is the ideal qtc for home applications, so it may not work well in cars. a little bit higher will help in vehicles. this is to help overcome the natural noise floor of the vehicle. around .9 if i remember what i read correctly. this is definitly an important factor to take into consideration.

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IronCy

Copper - Posts: 93

Joined: February 16, 2003

Posted: August 28, 2003 at 5:40 AM / IP Logged

As Qtc goes up, volume requirements goes down...for my specific speaker, a Qtc of .707, given the subs' thiele parameters, it would call for 3.5 cuft....as I raise it to .9, the volume requirement falls to 1.8cuft---including a 10% increase in volume and compensation for the volume of the woofer......but I also know that some mtx subs call for a Qtc of 1,.25.....so at this point I wondering what I should shoot for..........wizzle, what is the most often used at your shop......when trying to acheive spl, and thanks for your reply.

-Cy

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Anyone Use Qtc In Enclosure Calculations

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