Qts?

[hondarider 10+ year member]

Do these determine what size and type of box the sub should be in? And if so can anyone show how many qts=what kind of box?

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[JimJ 5,000+ posts]

Note: if you are using an existing driver, the driver's T/S parameters will typically make the choice for you. Low Q (

Hope this helps.

http://www.diysubwoofers.org/sbc/sbc5.htm

 

[JimJ 5,000+ posts]

in addition...

Speaker/Driver Selection

Sometimes, a speaker is designed or engineered for a specific enclosure. On the other hand, a majority of woofers can be used in various enclosure types.

As a rule of thumb, use the following equation to determine the suitability of your speaker.

Suitability factor = fs / Qes

Factor less than 50 the driver is best suited for a sealed enclosure

Factor between 50 and 100 the driver can be used for both sealed and vented enclosures

Factor above 100 the driver is best suited for a vented enclosure.

Use these factors as an estimation. For example if you want to build a sealed enclosure and the factor of the speaker is 55, the speaker should do fine in a sealed enclosure. The speaker suitability value is in the vicinity of the sealed factor.

The speaker being used has a Suitability factor of 55 which meets the criteria for a sealed enclosure.

This was determined by the following calculation:

Suitability factor = fs/Qes = 27/0.49 = 55

from http://www.ajdesigner.com/speaker/asealedexample.php

 

[Polecat 5,000+ posts]

Qts is called the 'Total Q' of the driver and is derived from an equation where Qes is multiplied by Qms and the result is divided by the sum of the same.

As a general guideline, Qts of 0.4 or below indicates a transducer well suited to a vented enclosure. Qts between 0.4 and 0.7 indicates suitability for a sealed enclosure. Qts of 0.7 or above indicates suitability for free-air or infinite baffle applications.

 

[denim 5,000+ posts]

for example

 

SoundSplinter RL-p D2 = fs/Qes = 23.433/.226 = 103.685 = ported box sub

 

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