Dual RL-P18 LLT for my 2000 cu ft HT soon - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 183 Old 04-22-07, 06:00 PM Thread Starter
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Cool Dual RL-P18 LLT for my 2000 cu ft HT soon

Final design not completed yet, but I will go for 2 boxes 550-600 L effective, 16 Hz tune, 8" or 10" port, powered by EP 2500, dual 2 ohm configuration.

I am not that good in woodworking, so I am only making the design on paper, but will have the job performed by a carpenter.

I have some variables I would like your advice about:

- MDF or not? If MDF, 16mm, 18mm, or 22 mm? Front baffle will bear both the driver and port.
- Is bracing a must? Never read that anybody made an enclosure without bracing, but I did that for my 4cu ft car sub. and it is rock solid and working very very well, I can even stand on it... no problem. Of course at least the port will be internally supported.
- Insulation: Is it a must? If yes, is 1" fiberglass ok? Should the volume be taken into consideration? I never read someone did...

Your inputs are highly appreciated.

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post #2 of 183 Old 04-22-07, 11:06 PM
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Quick note:

Don't get a carpenter to build your speaker cabinets, get a cabinet maker. If you do find a good craftsman, don't be suprised if he takes offense to the term carpenter. They are two totally different trades, and require different skills.

Also don't get a cabinet maker to build your house.

I use a combination of 3/4" (18.75mm?) and 1-1/2" (37.5mm?) MDF for subs. Bracing depends on cabinet size and design. Generally large flat surfaces will resonate at a frequency generated by the sub. On these surfaces bracing in beneficial.

Paul

Last edited by aceinc; 04-22-07 at 11:12 PM.
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post #3 of 183 Old 04-23-07, 02:49 AM Thread Starter
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Others?
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post #4 of 183 Old 04-23-07, 10:42 AM
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Sounds like a pretty serious project.
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post #5 of 183 Old 04-23-07, 12:21 PM
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Quote:
Dual RL-P18 LLT
When you say Dual RL-P18........dual 2 ohm configuration, do you mean two boxes with one D4 driver in each, or two boxes with two D2 drivers in each?

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post #6 of 183 Old 04-23-07, 12:53 PM
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Blaser, those are going to be some pretty big boxes, so you may not want to double up the thickness of the front baffle, but I would definitely put some cross bracing in there.

- OJ -

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post #7 of 183 Old 04-23-07, 04:49 PM Thread Starter
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Quote:
aceinc wrote: View Post
Quick note:

Don't get a carpenter to build your speaker cabinets, get a cabinet maker. If you do find a good craftsman, don't be suprised if he takes offense to the term carpenter. They are two totally different trades, and require different skills.
Well, maybe I used a wrong word, I meant a good craftsman. Anyway, while I am not skilled with my hands, I will witness all the job, and make sure everything is as per design. Nothing to worry about.

Thank you!
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post #8 of 183 Old 04-23-07, 04:56 PM Thread Starter
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

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brucek wrote: View Post
When you say Dual RL-P18........dual 2 ohm configuration, do you mean two boxes with one D4 driver in each, or two boxes with two D2 drivers in each?

brucek
Yes, amp will be loaded dual 2 ohm configuration, two boxes, each one will have a single driver D4 (wired in parallele).

I am nevertheless open to suggestions.

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post #9 of 183 Old 04-23-07, 05:13 PM Thread Starter
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Quote:
Owen Bartley wrote: View Post
Blaser, those are going to be some pretty big boxes, so you may not want to double up the thickness of the front baffle, but I would definitely put some cross bracing in there.
Well, being big has the advantage to be asked to contain much less pressure than small sealed enclodures, if we still beleive Pressure=Force/Area. But concerning the front baffle, I intend to have a big hole in it 8 or 10", and this will be pretty close to the driver.... .
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post #10 of 183 Old 04-23-07, 05:15 PM Thread Starter
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Re: Dual RL-P18 LLT for my 2000 cu ft HT soon

Can anyone comment about the insulation and best MDF thickness 16, 18 or 22? Are there better alternatives to MDF?

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