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Qtc must be greater than driver's Qts.
Qtc must be greater than driver's Qts.
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Old 19th April 2018, 09:35 PM   #11
SubSoniks is offline SubSoniks  Wales
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Quote:
Originally Posted by IG81 View Post
A driver with Qts=0.8 will indeed never reach Qtc=0.707 in a standard sealed enclosure. A driver's free-air Fs and Qts can only be raised in a sealed enclosure, now convolved into Fc and Qtc.

There may be a special case, correct me if I'm wrong, where a driver with lots of dense stuffing right behind it will have its Qms lowered, by extension lowering Qts below its free-air value, but putting this in a sealed box will still only raise it from there, although Qtc could be lower than free-air Qts. Whether this can be used to good effect is another matter.
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Old 20th April 2018, 05:47 PM   #12
Scottmoose is offline Scottmoose  United Kingdom
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Originally Posted by CharlieLaub View Post
I reiterate that "a Lower Qt" (your words) is NOT via reduction of Qts.
You're misreading. GM was referring to acoustic effects & OA system Q, hence noting 'technically Qtp' WRT a very heavily damped pipe.

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Also, much of what you state above is not correct.
Which parts, when you read it as intended, rather than assuming it refers to the driver's innate EM damping?

Anyway, back OT for the OP, what GM essentially meant was that if you've a high Q driver, then that is the minimum system Q you can obtain except in very specific circumstances which in most cases are 'you can't realistically go there' short of a Linkwitz transform or equivalent LF EQ, which are more easily achieved, but not always possible.

Note that a higher Q driver isn't necessarily 'rubbish' -it may be very good for the purposes it was inteded for. It does give you far fewer options though.
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Last edited by Scottmoose; 20th April 2018 at 05:52 PM.
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Old 20th April 2018, 07:51 PM   #13
MattSug is offline MattSug  United Kingdom
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Quote:
Originally Posted by Scottmoose View Post
You're misreading. GM was referring to acoustic effects & OA system Q, hence noting 'technically Qtp' WRT a very heavily damped pipe.



Which parts, when you read it as intended, rather than assuming it refers to the driver's innate EM damping?

Anyway, back OT for the OP, what GM essentially meant was that if you've a high Q driver, then that is the minimum system Q you can obtain except in very specific circumstances which in most cases are 'you can't realistically go there' short of a Linkwitz transform or equivalent LF EQ, which are more easily achieved, but not always possible.

Note that a higher Q driver isn't necessarily 'rubbish' -it may be very good for the purposes it was inteded for. It does give you far fewer options though.
Thanks for clearing that up, I'm looking drivers with QTS of around 0.5 now!
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