| | Help wih T line |  |
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schrummy
Basic Contributor
Number of posts : 366
Age : 34
Location : bag town, iowa
Registration date : 2009-07-01
|  Subject: Help wih T line  Sat May 28, 2011 2:22 pm | |
| want to build a T-Line for the GF and cant remember how to do it...
is the formula to calculate the length
wavelength = speed_of_sound / Hz
I think its right because speed of sound is Ft/s and Hz = 1/s so i get Ft as the final dimension but im not sure
then if i want a quarter length, i just divide it by 4. Also, cant remember how big the port area is suppose to be....
HELP!!!!!!
please and thank you | |
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The_Rowlands
I own this joint!
Number of posts : 7398
Age : 58
Location : MIDWEST
Registration date : 2007-08-08
| | Subject: Re: Help wih T line Sat May 28, 2011 2:27 pm | |
| t-line ??????? what the hell ya puttin it in ...hope ya got alot of room | |
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schrummy
Basic Contributor
Number of posts : 366
Age : 34
Location : bag town, iowa
Registration date : 2009-07-01
| | Subject: Re: Help wih T line Sat May 28, 2011 2:43 pm | |
| its for two 7s lol and its not going in my car.... | |
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chrisfish
I own this joint!
Number of posts : 6521
Age : 55
Location : Silt Colorado
Registration date : 2009-05-16
| | Subject: Re: Help wih T line Sat May 28, 2011 4:02 pm | |
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schrummy
Basic Contributor
Number of posts : 366
Age : 34
Location : bag town, iowa
Registration date : 2009-07-01
| | Subject: Re: Help wih T line Sat May 28, 2011 4:45 pm | |
| kk so im good. thanks Chris for the find. this might be bigger than i thought.... lol. well its either a TLine or a 6th order so..... | |
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chrisbaldelli
Above Average Contributor
Number of posts : 559
Age : 39
Location : Houston, TX
Registration date : 2008-11-30
| | Subject: Re: Help wih T line Sun May 29, 2011 2:07 am | |
| I've built a couple sets of tapered quarter-wave boxes for 3" and 4" drivers. Killer low end, efficiency, and control. You need the right speaker(s) for the job. Which drivers are you using?
The rule of thumb is "Port area = Sd" ... but everything is flexible. Tune to Fs.
Options for reducing space:
- taper the port area (reducing or expanding)
- adjust the mouth size (mouth < port area can be a good thing)
- raise tuning above Fs, and X-over
If you tell me the driver and available space, we might be able to run Horn Response simulations to get you in the ballpark. | |
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schrummy
Basic Contributor
Number of posts : 366
Age : 34
Location : bag town, iowa
Registration date : 2009-07-01
| | Subject: Re: Help wih T line Sun May 29, 2011 4:00 am | |
| it needs to be as small as it needs to be, its going in a car so... 32inches wide X 16 inches tall X as small as possible. The speakers are ED audio 7k.2s dual 4. waiting on ED to give me the specs on them due to them not being available on the archive folder... lol
fairly certain that the Fs is around 30
Qts is around .3
Qes is around .3
Qms is around 10.5 | |
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chrisbaldelli
Above Average Contributor
Number of posts : 559
Age : 39
Location : Houston, TX
Registration date : 2008-11-30
| | Subject: Re: Help wih T line Tue May 31, 2011 1:54 am | |
| To be honest, TL is only appropriate when space isn't an issue. For those 7's (with a Q of 0.3), just toss em in a ported and enjoy some excellent SQ. It's a waste of that glorious motor and suspension to trick up the box too much.
With a Q that low, you can IB or low-tune without much issue. Unless you plan to overpower them, I'd go deep and full rated. People rag on eD, but they're solid until you break em (and need the warranty). | |
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