Keager's Quad RE XXX 18 Underfloor IB Build

Sick... Subscribed...

Nice choice of amps as well. Are your XXX dual 4ohm? Pushing anything lower that 2.8ohm per channel would be taking a risk on the clones. I'm sure you already knew that though.

Understood. Pushing out a little over 2k watts per channel should keep the amp safe for sure. I haven't researched IB setup as much as other people have, but are we sure feeding your XXX half of their rms in an IB setup would maximize their potential?

You are correct. However, that is why I asked if your XXX were dual 4 ohm, so you could wire a pair of them for your amp to see 4 ohm per channel. I forget if RE even offers a dual 4 ohm option for their XXX line. I think I remember one of their older competition lines (was it the MT series) offered more VC options.

Anyway, for 2 subs per channel your options would be as follows:

If you had dual 4 ohm your options would be:
1 ohm
4 ohm or
16 ohm

Since you have dual 2 ohm, your options will be:
0.5 ohm
2 ohm or
8 ohm

You could always get another Clone. Driving matching subs with different amps would personally drive me crazy...

Take a serious look at the Ashly KLR amps. I have a pair of 3200s available pretty cheap.

Given the limitations of the Clone, your only option is to wire each subs VC in series then series the subs together for a 8 ohm load.

In a sealed application, you would need more power. I can't comment on an IB install though. I'm sure there are many smarter than I that can weigh in on your specific application.

How much are the RE xxx these days

Wow. I don't remember ever seeing those drivers used in an IB. How much power does it take to reach xmax, free air?

That's serious man. Sounds great. I'll be checking back frequently for sure.

Hey, since you have winisd, have you tried modling them at their RMS? Seems to me the goal would be as close to xmax as possible to give you the headroom you need/want. Not sure about you, but the last thing I would want if I was undertaking such a feat is to still want more... Still have that itch.

Regardless, I know you are going to be happy and impressed.

So if you decided to take that avenue, you would be feeding each sub roughly:

Crown = 1,250 watts (2,500/2 @ 2 ohm Stereo)

vs.

Clone = 1,100 watts (2,200/2 @ 8 ohm Stereo)
(need a Clone owner to verify actual power output @ 8 ohms)

Looks like you might get slightly more power if you went that route, but your Crown would be working much much harder pushing a 2 ohm load.

Looking at your situation, it kinda sucks. If you were to try to implement both amps, you would have some major power differences.

For instance, if you ran a pair (2) of your XXX from your Crown for a 4 ohm load to each channel, you would be able to squeeze 1,800 watts to each sub. However, if you were to run the other pair from your Clone for a 4 ohm load to each channel, you would see 4,400 watts to each sub. That's a huge power variance. It might be something that wouldn't bother you, but I personally wouldn't mess with that.

I'm under the impression that you have already purchased the Clone. Is that the case? If not, it sounds like another XLS 5000 would be better suited for your application. On the other hand, if you already own the Clone, I would seriously consider purchasing another one for headroom/flexibility purposes. You know, just in case you get the itch to put those badboys in a sealed application. Either way, sounds like you might have "address" (throw more money at) your amp situation one way or another to maximize your XXX's potential.

My .02. Hope it helps, or at least gives you some other things to consider.

Wow, just modelled these in WinISD, This is going to be an astonishing system! Those subs are insane in sheer size, its going to be a battle installing them, maybe you could fit in some sort of small hydraulic jack/trolley to get them in place in the manifold, and bolt them in, I would not like to imagine one of those coming through the ceiling!.

It seems you will have usable output down to 5Hz if the signal does not roll off through your various components.

Nice! Your mounting opposed right? I hope so!

Get another FP and use the crown for your LMS I'm subbed obviously!!! I wish I could go the IB route with my pair of those guys, that would greatly increase the efficiency of them. larger sealed boxes is where I think im headed though.

Dibbs! PM sent.

I didn't realize you already had a Ultra in your arsenal. If you already had one, why not just get three more vs. buying four new RE XXX?
I know the XXX has more xmax, but from what I have heard a lot of the other users post, the LMS is more linear, with less distortion and better response. Of course, I might not have read that verbatim, but the jest of my research points to the LMS being a better all around performer.

Maybe your IB install will put the two beasts on more of a level playing field. Interesting...

popalock,

I would agree with this as the efficiency of the RE's as you get above 40hz greatly diminishes and in a sealed alignment, I am sucking an aweful lot from the amp with demanding bass tracks (music actually)

How big is your IB cutout going to be? Are you at least going to be able to slide the subs through the hole you cut in your floor?

I mean, I guess technically your only real option would be to build the box, then install the subs afterwards unless you want your subs to lay in the crawl space while you build the box?

I couldn't image trying to manuver those things in a small crawl space... Sounds, exhausting.

Hey, if your crawl space is large enough to accomodate the XXX shipping tube, it might make it easer to use that and roll the sub into position vs. trying to shimmey it to your floor cutout.

Sounds like this is going to be a true labor of love for you. I'll check back after this weekend. Expecting some major updates...

Let me know about your spare LMS and Clone when you get the chance.

have you tried to free air one of them yet? Mine havent left the boxes since I put them in so I dont know what they will do outside the box. What i do know is that I dont even get CLOSE to xmax in the box and im running the fp14k as well...