TC 2K LLT - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 17 Old 12-19-07, 08:19 PM Thread Starter
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Re: TC 2K LLT

The mains and surround channels I'm building have very good extension, even into the 30's. I could cross higher if necessary but I don't think it will really matter. The purpose of the sub was to reach into the realm of frequencies used only in movies. I could easily cross at say 50Hz and give the speakers a little more breathing room.
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post #12 of 17 Old 12-20-07, 11:46 AM Thread Starter
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Re: TC 2K LLT

What type of foam, if any, do you use to put in the sub? If you guys have built other diy speakers what did you use in those?
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post #13 of 17 Old 12-20-07, 04:50 PM Thread Starter
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Re: TC 2K LLT

Well, from what I have read it seems that regular pink and also rigid fiberglass are two great options. However, since rigid fiberglass is difficult to find and often more expensive, could I just use either 3.5'' or 6.25'' pink fiberglass and just line the inner wall and the top cap?
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post #14 of 17 Old 12-20-07, 07:28 PM
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Re: TC 2K LLT

Ya, R13 is usually as thick as you will need to go. I actually used half the thickness of R13 as my tubes were a bit smaller diameter.


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post #15 of 17 Old 12-21-07, 12:05 PM
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Re: TC 2K LLT

Quote:
thxgoon wrote: View Post
Ya, R13 is usually as thick as you will need to go. I actually used half the thickness of R13 as my tubes were a bit smaller diameter.
Are those egg crate bed pads a waste of time? Also, I've read about some using Dynamat from the car audio world.

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GO MIZZOU!
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post #16 of 17 Old 12-21-07, 12:59 PM Thread Starter
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Re: TC 2K LLT

Mrstampe,

While not useless, its difficult to say if the specific type of egg crate you pick up is indeed able to provide a good deal of acoustic damping. If you can blow through it then it will have at least some benefit. Through all my research I found if possible get the rigid, aka 703 or 705, fiberglass and if not use the fluffy pink stuff. Both work well and while the rigid is the best it is difficult to find and usually pretty expensive. Here is a great site that compares a ton of stuff:

http://www.bobgolds.com/AbsorptionCoefficients.htm
http://www.foambymail.com/Eggcrate.html (has values for the egg crate)

In all, the fluffy insulation found at the local hardware stores if the best option, providing more acoustic damping than most acoustic foams and is very cheap. The only downside to this application is the health hazards.

One question that I can't find an answer to is if the R-value of insullation has a direct realationship to its acoustic damping properties. For example, OC makes 3 types of 3.5'' insullation with R-values of 11, 13, and 15. Since they are all the same thickness I'm not sure if they all perform the same or if the higher R-value indeed helps.

Hopefully this more than answered your question.

Nate
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post #17 of 17 Old 12-26-07, 11:39 PM
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Re: TC 2K LLT

I was wondering about the low crossover as well.

My mains extend to around 35hz and my surrounds extend to around 28hz (-6dB), but when I tried crossing my sub at 40hz, it didn't do much because it didn't have much low end output (UltraCube from Paradigm). I blew it very quickly because it had very limited output. With your design, however, it seems like a lower crossover would be fine. I'd probably stay closer to 50hz, though.

It really depends on how much amp power you have for your mains. At the time, I had only half as much power for them as I do now (Upgraded the receiver with store credit from sub).
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