Dual RL-p15 D2 LLT Sub Project... - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 177 Old 02-13-07, 11:46 AM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

Yes... I've considered it, but I don't want the IB backlashing into the garage and creating more noise for the house. I would lose the sound insulation of the room... which is something I worked very hard to accomplish.
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post #22 of 177 Old 02-13-07, 11:52 AM
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Re: Dual RL-p15 D2 LLT Sub Project...

Gotcha.
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post #23 of 177 Old 02-13-07, 07:12 PM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

Here's what Rodny and I talked about doing today...



We can adjust it a little bit if needed.
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post #24 of 177 Old 02-13-07, 08:57 PM
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Re: Dual RL-p15 D2 LLT Sub Project...

Hey Sonnie, what a neat project! This isn't going to help matters I know, but there is a calculation for it. What it boils down to is your going to need a 3.25 gap from the top of the base plate to the baffle instead of 2" I'm sure if we put our heads together.. we could figure something out, even though (in my perception) things just got a little more restricted.
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post #25 of 177 Old 02-13-07, 09:17 PM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

3.25" is not a problem at all... we can handle that. I stuck 2" in there just because that's what my PB12-Plus/2's are. I just figured it would be the same. But since we changed it to a front angle... thanks to Paul's suggestion, it gave me plenty of room. I can get more volume if needed... probably up to about 24 cubic feet.

I guess the next steps are:
  • Making sure we are close enough in the ball park for volume.
  • Determining what frequency to tune it to.
  • Port size and length.
  • Where to install the port (will it fit top to bottom and can it be fired out the bottom center or top center ... or does it need to be out one side... or two ports, one on each side).
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post #26 of 177 Old 02-13-07, 09:33 PM
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Re: Dual RL-p15 D2 LLT Sub Project...

Good news. As I mentioned earlier, with your room gain, 570 effective liters and a 13hz tune should work great. That's an 8" diameter port that is 34" long.


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post #27 of 177 Old 02-13-07, 09:49 PM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

That sounds good to me.

Right now I'm at 581 liters... I suspect there will be more than 11 liters occupied by the bracing and subs, so I probably need to up that some.


Is that 34" including the ¾" wall? That would make the pipe part actually 33¼".

So can I stretch the internal height to say 36" and adjust the width if needed... then place the port center of the box either ported up or down?
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post #28 of 177 Old 02-13-07, 10:09 PM
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Re: Dual RL-p15 D2 LLT Sub Project...

Make the actual port (I'm assuming you'll use sonotube) 34" long and then roundover in addition.

The port should be firing out one of the sides on the long 90"+ dimension. 36" definitely won't cut it, the internal port opening wants to be a minimum 8" from any obstruction, preferably more.


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post #29 of 177 Old 02-13-07, 10:21 PM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

Will do!

Thanks!
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post #30 of 177 Old 02-13-07, 10:26 PM Thread Starter
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Re: Dual RL-p15 D2 LLT Sub Project...

Quote:
SteveCallas wrote: View Post
I'm assuming you'll use Sonotube
I'm not sure I'll find Sonotube around here. Lowes may have something similar to Sonotube, but I know we have 8" PVC pipe that's very easy to come by.
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