TH/FLH with Tangband (Logitech) 10" for idiots? - Page 2 - diyAudio
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Old 25th August 2011, 12:11 PM   #11
hempie is offline hempie  Australia
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Hey Guys,

Im also in the Same Boat, i have a WT-644F Driver i wish to make another box for, i have checked out the Spec Sheet at Tangband and also Emailed them, they sent me a PDF with more Technical Data on what they say is an "optimum" design for the Woofer.. But reading on here i can see manufacturers do not always offer the best advice on box design though im sure they have good intentions...

Here is the PDF Tang Band Sent me, They mention the use of 2 ports? And a heap of other measurements but no Mention on what Size the box should be? Or where the location of the ports should be placed?

From what is said on the Forum a TH or TQWP is ideal, how do you determine where the ports should be placed or what the shape of the box from the Data Sheets should be , or even the size of the Enclosure? There doesnt seem to be any reference designs about?
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File Type: pdf WT-644F (Serial) Vented.pdf (103.4 KB, 83 views)
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Old 25th August 2011, 10:09 PM   #12
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You have to figure all that out yourself, do you have a simulation program like WinISD pro?

if you have questions, ask

you'll need these
Fs = 32 Hz
Qms = 11.2
Vas = 60 liters
Cms = 0.345 mm/N
Mms = 71.73 g
Rms = 1.288 kg/s
Xmax = 9.25 mm
Xmech = 13.88 mm
P-Dia = 211.1 mm
Sd = 350
P-Vd = 0.324 liters
--Electrical Parameters--
Qes = 0.433
Re = 6.4 ohms
Le = 1.6 mH
Z= 8 ohms
BL = 14.6 Tm
Pe = 180 watts
--Electromech. Parameters--
Qts = 0.417
no = 0.438 %
1-W SPL = 88.61 dB
2.83-V SPL = 89.58 dB
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Old 26th August 2011, 09:17 AM   #13
bjorno is offline bjorno  Sweden
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FYI:Using hempie's T/S for TB_WT-644F in T-TQWT's:

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File Type: jpg TB_WT-644F_T-TQWTs.JPG (921.2 KB, 159 views)
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Old 26th August 2011, 11:30 AM   #14
zman01 is online now zman01  Bangladesh
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Location: Dhaka

Thank you for modeling this driver .

I must confess I do not understand everything on your charts, but to me it looks like this driver will give work in the T-TQWT.

Now how do we convert your sim into a box plan? If I get that today I will build tomorrow itself!


Last edited by zman01; 26th August 2011 at 11:32 AM.
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Old 26th August 2011, 03:41 PM   #15
hempie is offline hempie  Australia
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Quarter Wavelength Loudspeaker Design

I Had a Breif read, from what i can see this Enclosure (T-TQWT) is used for Small Fullrange drivers or small woofers with low wattage tube amps?

The WT-644f runs happily at 180w and is quite large it dosnt have trouble making bass, wont this enclosure basically be a giant overkill, it would be a laugh to try it out, but wow 70 Litres enclosure size ?

Here i was thinking a basic ported Box would do, Its Research time!
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Old 26th August 2011, 09:39 PM   #16
zman01 is online now zman01  Bangladesh
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I'm familer with TQWT - I have a pair of BIBs (Bigger Is Better) speakers which are based on the TQWT design. Placed in corners, they can put out a lot of bass. My pair has Fostex FE166EN drivers which are 94 dB efficient. Even with a 3.5 watt/channel they play loud. However these are large cabinets. Greg Monfort (GM) developed a spreadhseet for DIYers where one can input the driver T&S and get the dimensions of the cab. I used that for my cabinet, very helpful indeed.

Here is a thread I've found on T-TQWT:

Building a nice Subwoofer - questions.

Last edited by zman01; 26th August 2011 at 09:43 PM.
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