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7 x RE Audio XXX 18" subs, Infinite Baffle Sub, Ultimate IB build - Page 12

post #331 of 540
those are dual 4 ohm coils.

if you wired your dual 2 ohm coils that way, it would net 1.33 ohms.
post #332 of 540
Quote:
Originally Posted by LTD02 View Post

those are dual 4 ohm coils.
if you wired your dual 2 ohm coils that way, it would net 1.33 ohms.

I think he is asking if he ordered 3 more RE XXX 18's if he should go with dual 2 or 4 ohm coils. This would be for the 3 array IB in the back of the room.
post #333 of 540
Quote:
Originally Posted by JapanDave View Post

Thanks LTD!
@MJ, that is a great web site, thanks for the link.
How would you wire up this pattern? Could you put the 2 + and 2 - together at terminal?

On each driver you would run a single wire from the + to the - of opposite voice coil on the same sub. You then run a wire from the + terminal of you binding posts or Speakon to the first + voice coil that is not connected yet, you then run another wire from that same terminal to the next sub and so on to the 3rd. You do the same for the negative terminals.

Check this out, I found another diagram that shows the wiring in an easier way to follow:

post #334 of 540
A 2.7 ohm load on a mono config'd amp is brutal, not a good idea IMO (as at some frequencies, the impedance could easily drop lower).
post #335 of 540
Thread Starter 
Thank MJ, that makes it clearer.

Just out of curiosity, could this be done to 2 drivers.

post #336 of 540
Thread Starter 
Quote:
Originally Posted by FOH View Post

A 2.7 ohm load on a mono config'd amp is brutal, not a good idea IMO (as at some frequencies, the impedance could easily drop lower).

What is a mono config amp? I was of the understanding that the Lab Gruppen's can handle 2 ohms? Or are we comparing apples and oranges?
post #337 of 540
Quote:
Originally Posted by JapanDave View Post

I am just concerned with this RS20i's base management. I only have 4 channels to use for subs with this. However if I was to ignor that and just use a channel each for each sub I would definitely be better off with the FP 10000Q for sure. I am going to have to make a few measurements to see what the FR is like I guess.

For simplicity there'd be no reason to use more than two channels of the RS20i.

One output for the front IB, one for the rear.


If you wanted to explore more optimization possibilities, you could split the front drivers as separately controlled elements, but it's not necessarily going to help. I'd stick with only the two outputs; front and rear, .... for now. Or just fronts, even more simple.

Thoughts?
post #338 of 540
Quote:
Originally Posted by JapanDave View Post

What is a mono config amp? I was of the understanding that the Lab Gruppen's can handle 2 ohms? Or are we comparing apples and oranges?

Depends how it's config'd.

The FP14000 is 4ohm bridged mono and 14kw. But I don't believe they handle a bridged load much lower than that. Individual channels can handle the low impedances, just not bridged mono config.
post #339 of 540
Thread Starter 
Quote:
Originally Posted by FOH View Post

For simplicity there'd be no reason to use more than two channels of the RS20i.
One output for the front IB, one for the rear.
If you wanted to explore more optimization possibilities, you could split the front drivers as separately controlled elements, but it's not necessarily going to help. I'd stick with only the two outputs; front and rear, .... for now. Or just fronts, even more simple.
Thoughts?

What I was thinking was using 3 channels. One for the bottom two subs at the front b/c time alignment would be exactly the same at the LP ,another for the top two subs for the same reason and one for the back 3 subs. I could bridge the FP10000Q and have 4200w into 8 ohms for each set of 2 drivers and then bridge a FP 14000 for the 3 drivers @ 6 ohms. Thoughts?

Edit: Big typo, that meant to say 3 drivers, not 6. Sorry.
Edited by JapanDave - 12/11/12 at 8:51pm
post #340 of 540
Thread Starter 
Well, the decision has been made. Another 3 RE XXX 18" driver will be headed out to Japan. So the journey continues.......

So all of those that have helped along the way far, I am going to need your help once more. smile.gif
post #341 of 540
Did I miss something? You're getting more XXX18's?

Suhweet! biggrin.gif
post #342 of 540
Thread Starter 
Quote:
Originally Posted by Scott Simonian View Post

Did I miss something? You're getting more XXX18's?
Suhweet! biggrin.gif

LOL

Yes another 3 to bring the total to 7.
Maybe now I can get my original plan of being flat to 5hz @ reference.
post #343 of 540
Is your silicone dry yet dave?
post #344 of 540
Quote:
Originally Posted by JapanDave View Post


Maybe now I can get my original plan of being flat to 5hz @ reference.

Ugh... I would say so. You will have similar output to what I do, +/- depending on room/amps differences, etc, and if I remember right 125 at 5 is about what headroom I have. You won't be using all of that...
post #345 of 540
Thread Starter 
Quote:
Originally Posted by keager View Post

Is your silicone dry yet dave?
It should be dry by now. I am thinking of taking the first set of tests tonight (It is morning here right now).
Quote:
Originally Posted by Ricci View Post

Ugh... I would say so. You will have similar output to what I do, +/- depending on room/amps differences, etc, and if I remember right 125 at 5 is about what headroom I have. You won't be using all of that...
LOL, Now that is head room. How big is your room and is it the standard dry wall setup?
post #346 of 540
Thread Starter 
I am trying to figure out which impedance driver I should get? I will be running all 3 driver off the Lab Gruppen FP14000, so should I get the dual 4 ohms and run them @ 6 ohms or the dual 2 ohms and run them @ 12 ohms. Although the choice maybe obvious I just wanted to check. BTW, will the different resistance in the coils give the driver a different sound. Sorry for the silly questions.
post #347 of 540
dual 4's to get a 6ohm load no doubt, it puts the LG in a perfect sweet spot.
post #348 of 540
Thread Starter 
Well, I tested the subs tonight and all I can say is earthquake!!!

The wall is completely sealed, I tested for leaks and I am good there, it really is amazing how these sounds. The pressure is indescribable, I feel like I am under water.
post #349 of 540
Quote:
Originally Posted by JapanDave View Post

Well, I tested the subs tonight and all I can say is earthquake!!!
The wall is completely sealed, I tested for leaks and I am good there, it really is amazing how these sounds. The pressure is indescribable, I feel like I am under water.

Nice! Did you get any measurements or use an spl meter?
post #350 of 540
Thread Starter 
No measurements yet. I have been trying to get REW to play ball with the RS20i receiver. I am still getting instructions on how to set it up as this unit is not your typical receiver. Also, it is night here and the kids are in bed, so probably not the best time to see how much SPL they produce. But I will get some data soon I am sure.
post #351 of 540
Thread Starter 
OK, some more impressions. One thing I really noticed was the amount of boost in the mid base punch after I got the wall sealed up. This really hits you in the chest now and I am noticing that certain frequencies are really loud, so I am going to have to get stuck into the EQ very shortly.
post #352 of 540
Keep the impressions coming Dave, very epic build.
post #353 of 540
Quote:
Originally Posted by JapanDave View Post

OK, some more impressions. One thing I really noticed was the amount of boost in the mid base punch after I got the wall sealed up. This really hits you in the chest now and I am noticing that certain frequencies are really loud, so I am going to have to get stuck into the EQ very shortly.

My next house is going to have to be IB friendly now, the chest punch is the best part and then you also have above reference level ULF's as well! That is bass heaven biggrin.gif

I wonder if there is any other way to get that level of performance from a XXX 18 besides a IB, would a tapped horn be possible?
post #354 of 540
Thread Starter 
Seeming as I will have a good bit of headroom I am going to apply a nice house curve. Not as dramatic as the graph below, but something similar. MJ, I think Ricci says he gets about 125db @ 5hz and he use sealed RE XXX's.

post #355 of 540
Thread Starter 
I still have not EQ'ed this, but.

Today, while the wife was out I let her rip... I have never been scared in a movie before like I was in the Pod emerges scene of WOTW. My whole body was shaking. I don't know who said there is no tactile feeling on concrete floors, b/c I felt like I was in a boat. The pressure was incredible, this was not leg pants moving stuff, it was literally vibrating my chest, my whole body, my skin. I kid you not, I was a little disorientated a couple of times in that scene, I could not think properly. Is this what base is supposed to be like? (Rhetorical question)

Can I ask when watching a movie, what should your SPL meter be set on, fast or slow?

I need someone to come over and experience this.
post #356 of 540
Quote:
Originally Posted by JapanDave View Post

I still have not EQ'ed this, but.
Today, while the wife was out I let her rip... I have never been scared in a movie before like I was in the Pod emerges scene of WOTW. My whole body was shaking. I don't know who said there is no tactile feeling on concrete floors, b/c I felt like I was in a boat. The pressure was incredible, this was not leg pants moving stuff, it was literally vibrating my chest, my whole body, my skin. I kid you not, I was a little disorientated a couple of times in that scene, I could not think properly. Is this what base is supposed to be like? (Rhetorical question)
Can I ask when watching a movie, what should your SPL meter be set on, fast or slow?
I need someone to come over and experience this.

first of all congratulations.
you must set the spl meter on C and slow.
post #357 of 540
Quote:
Originally Posted by JapanDave View Post

I still have not EQ'ed this, but.
Today, while the wife was out I let her rip... I have never been scared in a movie before like I was in the Pod emerges scene of WOTW. My whole body was shaking. I don't know who said there is no tactile feeling on concrete floors, b/c I felt like I was in a boat. The pressure was incredible, this was not leg pants moving stuff, it was literally vibrating my chest, my whole body, my skin. I kid you not, I was a little disorientated a couple of times in that scene, I could not think properly. Is this what base is supposed to be like? (Rhetorical question)
Can I ask when watching a movie, what should your SPL meter be set on, fast or slow?
I need someone to come over and experience this.

I'm warming up the private jet as we speak! Lol
post #358 of 540
Quote:
Originally Posted by mjaudio View Post

My next house is going to have to be IB friendly now, the chest punch is the best part and then you also have above reference level ULF's as well! That is bass heaven biggrin.gif
I wonder if there is any other way to get that level of performance from a XXX 18 besides a IB, would a tapped horn be possible?

Are you saying the RE's will have better midbass run IB as opposed to sealed?
post #359 of 540
Thread Starter 
Quote:
Originally Posted by beastaudio View Post

Are you saying the RE's will have better midbass run IB as opposed to sealed?

I am not sure if that is what MJ is saying, but I do know that the LCR's get a boost in base when put in a sealed baffle wall configuration.
post #360 of 540
Thread Starter 
Got my first measurement of the subs today.

Nice dip @ about 27hz, but as my ears were telling me, much, much, much, much, much room gain.

Using a sound devices USBPre 2 with an Audix TM1 mic.

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