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Old 04-24-2011, 09:16 AM
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Default Help with T-line if you don't mind

I am going to build a t-line for 2 Tang band 8's. I'm hoping someone with some experience with t-lines will jump in here. I'm stuck up at the hospital with my sick infant so I have limited internet capability and alot of down time so I'm designing a system for one of my cars using the info I have. This way when I get to work on it I'll have everything mapped out and pre-planned.

The speakers are tang band w8-740p, here are the specs:
FS 28hz
Vas .81
QMS 10.53
Qes .30
Qts .30

Cone area is roughly a 7.5 diameter so 45 square inches to make it easy.

So my mouth area is going to be 45 inches square or 9"x5" and the length I'm looking at is right at 7.5 feet. Anyone have any different suggestions? I'm looking for tuning in the 28-35 hz

There seems to be ALOT of contradicting info on t-lines so before I waste good wood, I'd like a second opinion. Thanks for your help.
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Old 04-24-2011, 10:30 AM
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If you're doing it for 2 subs then you need the line area to equal the sum of Sd (cone area). In this case, 45 sq in times 2 equals 90 sq in of line area. That is, of course, unless you were talking about 2 seperate boxes.

Also, where did you get 7.5ft? For 28-35hz I get between 8 and 10ft of line. Not that 6 inches is going to kill your project, but better to be as close as you can with the math since getting it as close as you can with wood is hard enough.

P.S.- what's wrong with your little one? I hope it's nothing serious.
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Old 04-24-2011, 11:50 AM
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Thanks for the reply. He's 6 months old and he has been in and out of the hospital many times. This time he has gotten the feared RSV which is a respiratory virus.
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Old 04-24-2011, 12:44 PM
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Quote:
Originally Posted by garychoffmann View Post
Thanks for the reply. He's 6 months old and he has been in and out of the hospital many times. This time he has gotten the feared RSV which is a respiratory virus.
Well, I wish you guys the best. My little man had some respiratory issues when he was little and it's scary as hell.

Good luck.

Hit me up if you need anymore help with the tline.
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