Custom RE XXX Subwoofer Build

[ISLAND1000]

Well I'll be moo . . . . there you are, deep inside the tuned portion of your project!

[Blaser]

Ricci wrote:

Also have you ever heard of placing your ports close to a panel to get a lower tune?

Standard design normally wants at least 1 port diameter to be left from all sides for the port to breath. Otherwise the tune will be decrease (that's what you mean) but port noise may occur (obviuosly not in this design).

Many of the top sub designers will use this technique( the EPIK Conquest and SVS Ultra13 both do). So much for keeping your ports at-least one circumference from any walls huh? I think this is also involved here with the distance of the disks.

OK. So it seems it is not for variable tune purpose but to decrease port length.... OK.

[Ricci]

By the way this is what Unibox predicts for this sub...Not too bad. Also ignore the lowest port resonances. The special porting system used should not have these.

[Mike P.]

Josh, how long until the sub is at your place?

[Ricci]

I'm not real sure. Nathan is still working on the cab. I believe he's got the basic structure done and now he's doing the veneering and wrapping things up. I've sent him one of the 18's and it should arrive at his place on the 22nd. From there hopefully he'll be ready to mount it and do some listening tests before getting ready to ship it. The shipping is probably going to be at-least 10days.

I guess I hope to have it by this time in June.

[vinculum]

That thing is a monster, Ricci! I hope you have good relations with the local law enforcement agents!

One thing if note, while the port is physically 10" in diameter, you are occupying the cross section width with another cylinder of wood. Typical 10" port rules no longer apply. It will model as a smaller diameter port with an enormous flare. Not a bad thing!

Dr V

[funky_waves]

The port area left is equal to a 9.375"dia port. and if the tuneing is what has been predicted the overall length including the flow guides will still be less than a 9.375" port would need to be to tune to the same frequency.

[Ricci]

The projected peak airspeed is right at 35ms at 10hz with the port area readjusted as a 9.375" unit. This is at full on peak output though. I doubt that there will be problems with chuffing or port compression. The huge flares and the flow guides should take care of buisiness.

A regular 9.375" port would still need a straight pipe of 55.75", compared to 36.5" for this design.

[Blaser]

Ricci,

This is not to mention that typical program material will be better represented by RMS velocity as opposed to peak.

[funky_waves]

Here is the latest pictures, one of the baseplate and one of the sub upsidedown, the last of the corners being glued in.

[Blaser]

That's one big beautiful sub

[Ricci]

Man that looks pretty good Nate! Not quite as dark as I thought it would be, but it looks nice. I bet it was easier to test mount that top assembly with out the motor on it.

This is gonna be one big, professional looking, overbuilt, over-engineered, monstrosity of a sub.

[funky_waves]

Remember the wood will get a bit darker when clearcoated. it is going to be nice for sure.

[Ricci]

I think I'm going to have to name this thing...

[funky_waves]

Finished, less the grill. Tuneing landed ~11.5hz.

[Ricci]

That looks really good. I can't wait to see...wait... experience it in person. If ever a gimongous subwoofer cab could look good, this is it. I'm still stunned by those spl readings down low too.

[Blaser]

EXCELLENT! I would like to see an actual FR at LP

[Ricci]

Blaser,
Look in the Battle of the Monsters thread located here in the FunkyWaves section. Nathan tested the max spl output before audible distortion and also took a frequency response measurement. It's at his place and not mine though.

[Owen Bartley]

It looks awesome... and man is it intimidating! I like the handle too, that just seems to take it to another level of saying "I mean business!". The enclosure makes the woofer look tiny, which is no small feat!

[Ricci]

Looks like this Behemoth is going to be shipping out, with the Dual SDX15 sub that Nathan built for me for winning the giveaway contest, today. I'm stoked. It's going to be hard to wait the week or so that it's going to take to recieve them. Look for lots of listening impressions and pictures when I get them. I'll also do some testing down the road, but I have to get a new laptop first.

Excuse me while I double up on my work-out regimen, in preparation for massive subwoofer wrestling sessions to come.

[Blaser]

Ricci wrote:

Excuse me while I double up on my work-out regimen, in preparation for massive subwoofer wrestling sessions to come.

Good luck!

[Ricci]

The sub is sitting in my living room and it is beautiful. The packaging was stellar with nothing out of place what so ever. I can't fire it up until tomorrow. I have to get Speakon cables. It is gigantic and I only put one small ding in it getting it in the house(doorway. not a big deal), which is not bad considering the size and weight of it and the fact that it was just me and one other guy.

[Owen Bartley]

Congratulations Josh! It must be very exciting getting a new toy like that. You know we want to hear your impressions once you get it going, but we also want more pictures!! Do you have this monster in a corner, or is it out in the open?

[Ricci]

I finally replaced my USB cable for my Olmypus and got time to post up some pics, so without further adeiu...

Here's the crate with love from Canada...






Here's some shots taken during the dismantling of the crate. The packaging was first rate.














Here's a shot right after we got both of the subs into the house that illustrates the size and girth of the XXX subwoofer cab. I'm the darkly tanned guy on the left!










Here's a shot of the SDX sub shot during one of many recuperation periods. As you can see it's no lightweight mini-sub either! See that staircase...yes it was a PITA. Thats my sister in the picture. The one with orange hair.

[Owen Bartley]

Wait... what!? Where did the SDX come from? It's beautiful! Why don't I remember anything about that one being built? What kind of wood is it? The grilles look awesome too, I love how Nathan does those.