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Old 8th August 2007, 04:33 AM   #1
Sushii is offline Sushii  Hong Kong
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Default Enclosures for Hartley 24"

Hello

I wish to build a cabinet for my pair of Hartley 24" speaker (the one with pipe sticking out from the middle)

It would be cross over at 150 Hz.

Any suggestion on the parameters of the cabinet?

I am new to speaker building, from searching, the Fs = 28-29 Hz, Q = 1.1 - 1.2

Could anyone suggest the size of the cabinet to be build?

Thanks alot!
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Old 8th August 2007, 05:49 AM   #2
banana is offline banana  Hong Kong
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Hi Sushii,

U need at least three parameters to calculate box size.
Fs, Vas and Qts

Now it's the Qts missing. But I bet if it's not in the TS-database, u won't find it anywhere else.
http://www.thielesmall.com/database.asp

If Q=1.1~1.2 is the Qts, it'll only be useful either in open baffle or in huge sealed box. We're talking 200+ liters of volume.
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Old 8th August 2007, 06:00 AM   #3
BHTX is offline BHTX  United States
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Those are definitely some odd looking drivers, and perhaps fairly rare too.
Without being able to obtain any parameters, and for a project this large, I'd say testing for Thiele-Small's yourself might be in order. A Woofer Tester 2, or anything similar, would probably provide you with the information you need. However, if Qts is as high as you say it is, banana's statement regarding OB or IB are probably correct. On the other hand, I think I came across some older guy using a pair of these in separate TL's. I think they went up through his attic, if I remember correctly, with the drivers coming out of the walls in his living room.
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Old 8th August 2007, 08:59 AM   #4
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Hart;ey recommends a fairly small box with no back with stuffing, I think the box is 30"by30"by20". Richard at Hartley, Audio Lab in NOrth Carolina can help you with that. It is his design, otherwise that box is going to be huge.
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Old 8th August 2007, 09:26 AM   #5
sreten is offline sreten  United Kingdom
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Hi,

I'd say definitely open baffle. A box with no back is folded open baffle.
The sort of drivers you put into walls between rooms for uber bass.
edit : I'm estimating Vas is an utterly monstrous figure.

/sreten.
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Old 8th August 2007, 09:32 AM   #6
Sushii is offline Sushii  Hong Kong
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Would like to be able to try open baffle, but it is not an option

I will have to build a cabinet for them...

is folded open baffle offer the same bass as mounting them into wall?

if so, could you advise the size of the baffle?
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Old 8th August 2007, 10:19 AM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Sushii


is folded open baffle offer the same bass as mounting them into wall?

Hi, No. In a wall you do not have open baffle loss. /sreten.
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Old 8th August 2007, 10:34 AM   #8
bjorno is offline bjorno  Sweden
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Quote:
Would like to be able to try open baffle, but it is not an option...
Any closed volume larger than this folded application uses would be sufficient!

http://www.diyaudio.com/forums/showt...847#post993847

b
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Old 8th August 2007, 10:55 AM   #9
banana is offline banana  Hong Kong
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I wanted to say Vas but written Qts...... that's a typo

I have a speakerworkshop jig that could measure Vas. But I use added mass method that might damage the cone. Knowing the exact Vas is not necessary, since it's going to be enormously large.

There's one more opinion, build the largest box u can have (say 300~500Ltr), and then add flow vent.

Are u crossing it actively? If so, Linkwitz transform will also do.
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Old 8th August 2007, 12:27 PM   #10
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Quote:
Originally posted by howard99
Hart;ey recommends a fairly small box with no back with stuffing, I think the box is 30"by30"by20". Richard at Hartley, Audio Lab in NOrth Carolina can help you with that. It is his design, otherwise that box is going to be huge.
http://www.audiolab1.com/

Richard has been known to post on this forum; suggest a Search

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