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Bedlam in Goliath: RE Audio XXX18 subwoofer build - Page 2

post #31 of 327
That is a proper MONSTER


The power port idea is very interesting as well.
post #32 of 327
Thread Starter 
Quote:
Originally Posted by DS-21 View Post

I hope you're going to rent a U-Haul to pick that monster up!

Shipping is going to be palletized freight from British Columbia to New Albany IN. Going to go through my work for all of those arrangements. We get huge discounts and command respect since we are the largest volume shipper in IN. Still got a lot to iron out in that respect. It ain't gonna be cheap! Sometimes you've gotta pay to play.
post #33 of 327
Thread Starter 
It's almost complete. There are a few details left for Nathan to take care of, such as the custom bar grill for the driver, but the finish is done. This is the latest picture.








Whaddya think? I haven't actually laid eyes on it yet, but dang! That's not too bad lookin for a 300+lb, refrigerator sized, subwoofer. Right?
post #34 of 327
Ricci,

All I have to say is WOW ! To the cabinet builder...first class work,and to you ...way to go,you have one of the better subs I have seen.
post #35 of 327
Wow, when I saw the pic I thought that must be some smaller RE driver.

"You have to respect a subwoofer cabinet that you can stand in!!!!!!! "

And you think the bass is good outside the box
post #36 of 327
Wow what a sub

Excellent work by Nathan who is a heck of a great guy to deal with by the way.

I hope you are drinking extra milk Ricci so the attack from that sub does not fracture a bone or two
post #37 of 327
That my friends is a work of art... execution, fit and finish get a 10 in my books... ! Beautiful!
post #38 of 327
What's that thing weigh? 500 lbs?
post #39 of 327
Quote:
Originally Posted by price3 View Post

What's that thing weigh? 500 lbs?

I estimate ~350-400lbs,it is birch they used,in MDF this would top around 500lbs.

I am in awe of that piece...


Ricci...

You need a bigger sub! I think you will best the SveeS UbberUltra13.3 and the upcoming top secret HeichSU FlatTo10 Hz sub.As well as the JayL Odio FatOhm!!!!
post #40 of 327
Thread Starter 
Thanks for the comments guys. I have to give major props to Nathan Funk. He is truly a master of his craft. I had my doubts at first because this thing was so over the top. Huge, complicated, weird port system, 80lb driver, premium finish and all...He really came through. I got more and more impressed with his skills as the build progressed and I saw things taking shape. There was one point where I was really blown away.

In the middle of the build after the cab was built and ready to be veneered and finished, Nathan sent me an e-mail asking me this.

"I should have the whole box together this week, but then I have to store it for a week or so, with the veneer ect at room temp, so all the materials are at the same temperature and humidity before laminating them, did you ever tell me the average humidity where the sub will be? I like to have it close if possible."

I think that speaks for itself.
post #41 of 327
Thread Starter 
A few other notes. To you guys it may seem that this build was super quick, but it has been quite the process. I just didn't post much about it until things were getting down to it.

The planning started back in mid February and went to early March with me and Nathan corresponding back and forth laying out the game plan. About mid March things started rolling. He got the materials and actually started on it about April 4th. Things progressed quickly from there with only a few delays. Like waiting on the 2nd XXX to get to me so I could send it to him. The 1st one's shipping crate was destroyed by UPS ,so I had no way to get it to him safely(there's a whole thread about that at the HTS forum). All in all the actual construction of the sub only took about 3 or 4weeks, which is pretty impressive considering what it is.
post #42 of 327
Humidity levels are very important when working with wood.... and a true woodworker knows how to compensate when building a cabinet with doors.... as with more humidity, the parts swell... and gaps tighten up.
post #43 of 327
Thread Starter 
Here are a few more tidbits. The powerport appears to be as good as advertised so far. The tune came in at 11.5hz. Nathan was testing the max in room spl output of this sub, along with an LMS5400 18 and an Acoupower 18, that were both in a 340L tube, tuned to 16hz via dual 6" flared ports. He used a QSC PLX3602 bridged and basically cranked each of them until they started to sound stressed. This is what he recorded for my sub with the XXX.

RE XXX max output:

118.6db @10Hz
120.4db @15Hz
124.0db @20Hz
114.5db @25Hz
114.2db @30Hz
117.7db @ 40 Hz (amp limited)

The lower readings at 25 and 30hz appear to be at-least partially room related, since the LMS and Acoupower recorded their lowest readings there too. With that much output at 10hz and the 11.5 hz tune it seems to confirm that the powerport is a success. I'm not sure whether he experienced any chuffing or port compression during the 10hz test. Regardless the whole point of the powerport was to get massive port area with a super low tune, to minimize chuffing, compression and port resonances so that dumptruck loads of subterannean goodness could be unleashed from the XXX. Initial tests look promising!



The graph below is from the WFT3 testing of the sub in the enclosure indicating the 11.5hz tune.

post #44 of 327
118.6 dB at 10Hz ! Holy power ports...that is some output.
post #45 of 327
props to Ricci and Nathan for making the first correct XXX ported box...

knowing how this driver models, i will say its quite nice when you tune it very low in a very large box... having said that, if you tune it high in a medium or small box, it rings like nasty.. and thats what people do in car audio!!! Ricci imagine what this woofer looks like in 5 to 7 cubes tuned to 32Hz! BOOOOMYYY. <-- typical car audio install.

anyway, looking good! should sound very nice.
post #46 of 327
I like it.
post #47 of 327
This is very interesting indeed. So how about the port noise and cuffing? Does it work as planned, or is there audible port noise and cuffing?


One more thing. Can you share us the power port calculator excel?
post #48 of 327
Thread Starter 
Quote:
Originally Posted by KyleLee View Post

props to Ricci and Nathan for making the first correct XXX ported box...

knowing how this driver models, i will say its quite nice when you tune it very low in a very large box... having said that, if you tune it high in a medium or small box, it rings like nasty.. and thats what people do in car audio!!! Ricci imagine what this woofer looks like in 5 to 7 cubes tuned to 32Hz! BOOOOMYYY. <-- typical car audio install.

anyway, looking good! should sound very nice.

Thanks Kyle,
Yes with this 18 you either go really big and tuned low, or try sealed. 14hz is the highest I would try to tune this thing ported. 7 cubes tuned to 32hz is a giant boomy peak that looks like the charcoal drawings of devils mountain from close encounters of the 3rd kind and THEN you add the cabin gain Ick. I certainly wouldn't use it like that. The response doesn't start playing nice until 19cu ft tuned to 14hz. So that's the "small box" recommendation for this dude. I do have another one that I'm not sure what I'm going to do with. Probably sealed. This one was for the all the naysayers.
post #49 of 327
Thread Starter 
Quote:
Originally Posted by anidabi View Post

This is very interesting indeed. So how about the port noise and cuffing? Does it work as planned, or is there audible port noise and cuffing?

Well I would say that so far the indications are that this port is doing what it is supposed to. The tune is really close to what it should be 11.5hz. And apparently it does flow a lot of air, judging by the 118.6db that Nathan recorded at 10 hz in his room. It also recorded 120.4 at 15hz vs 119.4db (LMS) and 114.4db(Acoupower). He did not comment on any port compression or noise from it, but he did comment that his dual 6" flared ports on his 16 hz tuned 340L sono were compressed by both the LMS and the Acoupower during testing. I don't know I asked him for some more info about that, but he hasn't replied yet.
post #50 of 327
Quote:
Originally Posted by SteveCallas View Post

I like it.


It is a real deal EBS ...done right ! Who can not like it...even Bosso has little choice.
post #51 of 327
The cabinet work is stunning. I certainly hope it can be safely shipped.

What did the 1st port resonance freq come out to be?

Dr V
post #52 of 327
Thread Starter 
Quote:
Originally Posted by Vinculum View Post

The cabinet work is stunning. I certainly hope it can be safely shipped.

What did the 1st port resonance freq come out to be?

Dr V

I'm not quite sure yet. One of the claims of the power port is that since it has no straight line path from the port to the outside air it is less of a concern. I guess I will find out.
post #53 of 327
A+ on build quality and your choice of veneer....the WOW factor kicked in seeing somebody standing inside the enclosure.
post #54 of 327
Quote:
Originally Posted by TheEAR View Post

It is a real deal EBS ...done right ! Who can not like it...even Bosso has little choice.

You are correct. If you're gonna do it, do it right.

Very nice project. I sure hope to see more in the way of measurements in-room, the specifics of the room it's in, placement, the rest of the system it will be mated with, etc.

Bosso
post #55 of 327
Thread Starter 
I will probably not have the sub and be ready to start messing with it for another 3 or 4weeks. I plan on doing some measurements and a lot of listening impressions. I will post some details of the room it is going in in the next few days. It is a VERY strangely shaped room and probably far from ideal, but it's what I've got until I move. Also the sub enclosure was designed to fit in a certain spot in the room, hopefully it is not too bad. I'll try to provide a floorplan of it in a few days. The equipment is nothing too extravagant compared with what some have around here either. I will list it soon too.


Regarding the powerport...Here is a post from Nathan over in his area at HTS.

"The port system seems to work as predicted I don't recall hearing anything from the port. Although to be honest I did not pay close attention to it. I will do some more listening.

For real world material there is defiantly no noise at all, even my LMS enclosure with either the LMS or the Acoupower has no problems with real material, only with pure sine waves.

So far I think I prefer the Acoupower for music, the XXX for movies and the LMS for both. This seems to correlate with the max output numbers.

To use some "bad" subwoofer terms; the Acoupower is the "tightest", the XXX the "softest", but very weighty in the low end and the LMS is somewhere in-between for both aspects. None of them seem "slow", "boomy" ect.

All three are defiantly in the same league with each having there strong points. I think the Acoupower and the LMS are very close as do the people who have heard both. One person prefers the LMS but is not sure why, I am yet undecided. The XXX is the best at making it feel like a track hoe is trying to shake the building down, the other two maybe a smaller track hoe. The only "bad" thing about the XXX is that to really get the best out of it you need around 20cubic feet, whereas the LMS and Acoupower work in substantially smaller enclosures."


And a further comment from him on port noise, compression, etc from the powerport.

"I did some tests at 11 and 12hz and the amp clipped at about 116db, that is likely due to the fact that that is where minimum impedance occurs. There is some air noise from the port but not much at all. Defiantly a ton of air moving!"
post #56 of 327
Very interesting ! To say the least.

Finally the Acoupower gets more exposure and very good comments,to be in a company of the TC LMS-Ultra and a RE XXX and hold your own ...it takes a special driver.

Yep yep...I am now looking online for a pair of RE XXX 18's.
post #57 of 327
Arthur, you're gonna have to update your liters of displacement and sub count!
post #58 of 327
Thread Starter 
Here is the current equipment that will be used with this sub. Nothing extravagant, or particularily noteworthy to brag about atleast not compared to the sub.

Outlaw 950 processor
Samsung HD-950 DVD/SACD
Toshiba TDP-S8 projector
100" Panoview Gray Wolf 2
Panasonic 32" Tau CRT
5 Behringer B2031A active monitors
Velodyne CT1500 (to be sent back to the minor leagues)
Crown CE4000
Behringer DCX2496
Rane PE-17


Hey it's what I got and it works for me. I'd much rather be pairing the sub up with my Klipsch CF-4 5.1 system, but they are huge and I can't fit them into the living room in place of the B2031A's. I also will not be attempting to take this 400lb??? sub upstairs to the Klipsch's. That will just have to wait until I move.

The set-up that I have now is far from ideal, but it's the only room I have to work with. The room is very odd, unusual and tricky (house is circa 1896). It has 3 windows, a total of 4 doors (2 dutch doors, a door to the backyard, a door to the upstairs)a sealed up fireplace and a staircase to the upstairs with a landing. . It's a real compromise to get good speaker placement, seating with appropriate viewing angles, and clear walking lanes. It's like a 3d jigsaw puzzle. I'll post a floorplan later so it will sink in.
post #59 of 327
Thread Starter 
Here is a rough floorplan. I didn't do very well with it but it will serve. I didn't have much time, or really like the program I used. Anybody got one to recommend? Preferably simple, quick and free?

The longest room dimensions are

L 21'6" from the front of the bay window to the back wall by the stairs
W 15'6"
H 10'8"

As you can see it's not that cut and dry. as far as I can figure the room is about 3600cuft. This is after subtracting for the fireplace, stairs, the bay window area, etc. I've indicated where the sub will be.


post #60 of 327
Quote:
Originally Posted by Ricci View Post

Here is a rough floorplan. I didn't do very well with it but it will serve. I didn't have much time, or really like the program I used. Anybody got one to recommend? Preferably simple, quick and free?

http://floorplanner.com/
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