Dual RL-p18 LLT begun

**Avus_M3** · **12-01-07, 05:45 PM**

I can see my wife slapping me in the future and calling me a kid when I break something important or valuable with these babies!!

**tjambro** · **12-01-07, 06:03 PM**

Dave,

I just looked at your thread and you are gonna have some serious bass! I suspect you will have WAF issues also...and possibly NAF (Neighbor Acceptance Factor) issues also.

**Avus_M3** · **12-01-07, 06:34 PM**

Yeah...certain people close to me who thought it was cool changed their mind once they saw the subs...now they think I'm MAD.

**Blaser** · **12-02-07, 02:32 PM**

tjambro,

I will go offtopic a bit because I don't know where I will post that. I think you ar using a projector, don't you have any problems with vibration?...I know your room will be seriously vibrating at high SPL

**tjambro** · **11-03-08, 05:19 PM**

Quote:

Blaser wrote:

I will go offtopic a bit because I don't know where I will post that. I think you ar using a projector, don't you have any problems with vibration?...I know your room will be seriously vibrating at high SPL

Wow, this is very old but I just noticed it, sorry Blaser. Yes I was using a projector and the projector did not vibrate. I put a piece of closed cell foam that I had left over from the project under the projector mounts. That seemed to stop the vibrations. I should say that I THINK it stopped the vibrations because once while watching the ice crack at the beginning of "The Day after Tomorrow" something vibrated, either the projector or the screen. I personally think it was the screen as it was not attached to the ceiling above due to a pan or vaulted ceiling.

I am ashamed (or proud

) to say that the subs did knock a picture off the NEIGHBOR'S wall...oops...

If I remember correctly, you have some fairly strong bass capability yourself.

-Tom A.

**tjambro** · **11-03-08, 05:29 PM**

Well guys, this project is no more. I sold my single level ranch in June and moved to a similar sized house that has a full basement! Yes, the whole right side of the basement will be converted into a theater, lobby, etc.

This time around, I think I am going to try a very large sealed box/IB behind the screen area. I want to go with 4 18" drivers. Although I already have 2 SS RL-p18's, if I buy 2 more, the combined VAS is going to be larger than I am willing to dedicate to the enclosure to achieve 10X total VAS, so I plan on selling those...see the Classified Section if interested...but I am giving away my boxes if anyone wants them.

The boxes are exactly as they are in this thread. They are not pretty but I thought they worked very well behind the screen in my previous theater. I cannot ship them due to size and weight, but they are free to anyone who wants to come and pick them up in Evansville IN 47715.

You can have one or both...just let me know.

-Tom A.

**kryptonitewhite** · **11-03-08, 09:52 PM**

Quote:

tjambro wrote:

Thanks Bob.

I don't think I'll tell my wife about the inevitable third box at this time. She doesn't understand this project yet, I can only imagine what she would think if I told her I need two more boxes in the back of the room to compliment the two in the front.

-Tom A.

hehehe youre a funny :P

i got a long ways to go to see how this turned out....i think im only on page 2.... so far, looks kick !

**Scott S** · **11-04-08, 04:41 PM**

Quote:

tjambro wrote:

Well guys, this project is no more. I sold my single level ranch in June and moved to a similar sized house that has a full basement! Yes, the whole right side of the basement will be converted into a theater, lobby, etc.

This time around, I think I am going to try a very large sealed box/IB behind the screen area. I want to go with 4 18" drivers. Although I already have 2 SS RL-p18's, if I buy 2 more, the combined VAS is going to be larger than I am willing to dedicate to the enclosure to achieve 10X total VAS, so I plan on selling those...see the Classified Section if interested...but I am giving away my boxes if anyone wants them.

-Tom A.

You could still use them with very good results in an IB if you get another pair. While most shoot for 10x VAS you do not necessarily need the full 10x VAS. That's just the optimal number. IIRC, you can even go with 4x VAS and still get great performance. In fact, I doubt there would be any change in Qtc.

**tjambro** · **11-04-08, 05:14 PM**

Quote:

Scott S wrote:

You could still use them with very good results in an IB if you get another pair. While most shoot for 10x VAS you do not necessarily need the full 10x VAS. That's just the optimal number. IIRC, you can even go with 4x VAS and still get great performance. In fact, I doubt there would be any change in Qtc.

True, but since I'm building from scratch, I figure I'll plan for the optimal number. If I don't sell them, then perhaps I will buy two more. I really did enjoy them, they had more power than I thought possible!

-Tom A.

**tjambro** · **11-04-08, 05:26 PM**

Quote:

kryptonitewhite wrote:

hehehe youre a funny :P

Thanks Kryptonite, that's what my wife thought until I built the dual LLT's...then she thought I was scary and insane.

Like many others have probably experienced, these custom sub builds put out more power than even we zealots could imagine.

In the old theater, on more than one occasion, I've actually had sheet rock flakes land on my head during an intense bass scene. Now, I did have a HVAC return that I put in directly over my back row of seats (by projector) that probably still had some loose sheet rock particles from when I cut it, but it still makes you wonder the long term effects these subs have on a house's structure.

-Tom A.

**Scott S** · **11-04-08, 06:30 PM**

Quote:

tjambro wrote:

True, but since I'm building from scratch, I figure I'll plan for the optimal number. If I don't sell them, then perhaps I will buy two more. I really did enjoy them, they had more power than I thought possible!

-Tom A.

That's all good. Just figured you could keep two great subs if you just plan on owning four in the near future. Although, I still would use them even if I couldn't get 10x VAS. The VAS for the RLp18 is around 300 liters. 4x that is HUGE. Try modeling a sealed sub with one RLp18 in 1200 liters. A stack of those would be identical to the performance of 4 RLp18's in an IB. So why not?

If you do get some other drivers to replace the SS, look into some Exodus Maelstrom-X's. Those are mighty fine and a little cheaper than the SS's.

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