First DIY subwoofer project! - Page 2 - AVS Forum
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Old 12-18-2012, 12:43 PM
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Ok I hate to butt in but.... I have 4 200w amps and am going to do 4 12s in my 14x22.5x8 foot room. shouild i go sealed or ported? i gotta hage 18-20hz at respctable levels. or should i do ported up front and sealed in the rear. only problem I see with doing sealed and ported together is I only have one eq2. Your thoughts?
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Old 12-18-2012, 01:03 PM
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Are they the Yung 200 watt amps? Ported all the way if strong 20hz output is your goal. Which 12's are they?
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Old 12-18-2012, 01:41 PM
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No they are lt 200s. Got a deal I couldn't pass up. Am looking at these the jbl gt5. I won't be able to have as big of a box for the rears but the fronts I can go up to about 6 cub feet internal. Backs will have to be more like 3 or 3.5. I have a2 300 now.
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Old 12-18-2012, 02:36 PM
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That driver has a higher then ideal Qts, but you can still get decent results with a smaller ported cab. If you can fit a 4 ft3 box in the rear you can get by with all of them at that size. A 4" x 17" port will tune you right around 20hz. The downside being a mild hump centered at 50hz, but that isnt really an issue as it goes away with a standard 80hz LPF.

Here you can see the results with the 80hz filter
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Old 12-18-2012, 03:07 PM
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thanks. is that chart for the infinity ? i could probably fit a 4cub in the back. I always thought my ed sub was tuned to 20 hz but after doing some reserch on winsid it is only tuned to 26hz. that being said i have a lot of room gain from 25hz down. with my sub now i have more output at 18-20 then i do at 27-30hz so a sub that is actually tuned to 20 hz should be pretty impresive in my room. at least i hope.
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Old 12-18-2012, 03:13 PM
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Quote:
Originally Posted by SULLY12 View Post

thanks. is that chart for the infinity ? i could probably fit a 4cub in the back. I always thought my ed sub was tuned to 20 hz but after doing some reserch on winsid it is only tuned to 26hz. that being said i have a lot of room gain from 25hz down. with my sub now i have more output at 18-20 then i do at 27-30hz so a sub that is actually tuned to 20 hz should be pretty impresive in my room. at least i hope.

That's for a JBL GT512
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Old 12-19-2012, 09:59 AM - Thread Starter
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Would there be any benefit to setting the crossover to 100hz on the two subs and just putting them under the bookshelves (or maybe slightly further apart)? I figured that might be good since I only really listen from the center of the room.


So the Yung amps and Infinity drivers should be a solid system?
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Old 12-19-2012, 12:51 PM
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Quote:
Originally Posted by drewDOOM View Post

Would there be any benefit to setting the crossover to 100hz on the two subs and just putting them under the bookshelves (or maybe slightly further apart)? I figured that might be good since I only really listen from the center of the room.

Play around with it. Hard to say what it will do in your room, but generally opposite corners will do the most to excite room modes giving a flatter response. Flanking each main speaker is worth trying as well.
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Old 12-21-2012, 10:25 AM - Thread Starter
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Okay, so I decided that I'm going to just build 1 sub first and then determine whether a second one would be beneficial after that. Since I'll be using the same driver and amp, I figure it won't make a difference whether I build them one at a time for both at once. Anyways, so I am ordering the Infinity 1260w and either the Bash 300w or the Yung 300w amp.

I made a couple designs-some front firing and some down firing. Is there any reason that I should choose one over the other?


(My room is upstairs so I don't want too much of the sound to carry downstairs)
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Old 12-21-2012, 12:26 PM - Thread Starter
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Do the subwoofer drivers come with a gasket on them, or do I need to buy or make one? It looks like the Yung SD200 has a gasket on it already but I couldn't tell with the Infinity 1260w.
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Old 12-21-2012, 12:50 PM - Thread Starter
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Just kidding, I found out the answer about the gaskets lol. So downfiring is better than forward firing?
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Old 12-21-2012, 03:58 PM
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Yes smile.gif
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Old 01-24-2013, 06:27 PM
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How is this going? any updates?
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