Seeking for help, - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 34 Old 01-20-15, 01:50 PM
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Re: Seeking for help,

A passive radiator is simply doing the job of the port.

Silence is golden but duct tape is silver.

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post #22 of 34 Old 01-20-15, 06:34 PM
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Re: Seeking for help,

http://www.diysubwoofers.org/prd/

I linked above a site that provides the need conversion information.
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post #23 of 34 Old 01-20-15, 07:44 PM
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Re: Seeking for help,

Thanks for the link colofan.

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post #24 of 34 Old 01-23-15, 11:13 AM Thread Starter
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Re: Seeking for help,

Any one have some experience with tline? Maybe they are an alternative. I did draw something like this. The beginning of the port is around the drivers sd and tapers out to about 1,25 times the drivers sd. Any suggestions?
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post #25 of 34 Old 01-23-15, 12:23 PM
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Re: Seeking for help,

Transmission lines are simple yet take time to get the tuning right.
The length of the line is usually 1/4 wavelength of the drivers resonant frequency Fs and you fill the line with between 0.5 to 0.7 lbs stuffing.
I would recommend reading this summation of the design process http://www.t-linespeakers.org/design/classic.html

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post #26 of 34 Old 01-23-15, 12:45 PM
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Re: Seeking for help,

I can't find the T/S parameters on their website and the only thing I see for a spec was:Xmax = 12mm one-way by 70% BL.
Also the closest model I can find: E-8 v.3. I don't see a V.4 anywhere on their site?
Your cones excursion was well over 12mm in some of your graphs. I read somewhere xmax + 10% and you need to call it quits and reign it in.
Maybe your planning to use a high pass filter to keep cone excursion in check?
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post #27 of 34 Old 01-23-15, 12:49 PM Thread Starter
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Re: Seeking for help,

I know t lines need to be tuned at the drivers fs, but in my case my drivers fs is pretty high. around 50Hz. would it be a problem if i tune it lower than the subs fs, or will this take away the advantages of a tline? I saw some tline vids on youtube and they seem to reach pretty low due to the shallow roll-off which impressed me quite a lot. Should it be stuffed from start to finish throughout the whole line?
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post #28 of 34 Old 01-23-15, 01:12 PM
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Re: Seeking for help,

In the link I posted they say that with room gain you can get useful output to around ½ Fs
The driver is rated at 48 Hz so you should get useful output to 24Hz.
The stuffing should be along the length of the tube and some materials are better than others as the article explains.

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post #29 of 34 Old 01-23-15, 01:34 PM Thread Starter
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Re: Seeking for help,

So that means that I will be fine at a 48Hz tuning? once I have stuffed the line ofcourse..
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post #30 of 34 Old 01-23-15, 05:32 PM
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Re: Seeking for help,

It seems that is the case.

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