Stereo Integrity's new HT Subwoofer - Page 24

That's just the rubber outer gasket that probably got pushed up from me handling the driver. Maybe we can do another group purchase or something down the line.

Jonathan - One of the KC guys should rent a big old van and make a trip up/back. Pack 30-40 of these to take home. Maybe we could do a NE theater tour if you made the trip out.

ROAD TRIP
Edited by Gorilla83 - 1/6/13 at 10:19am

I would imagine that being the rubber gasket. Can't expect an 18" long throw driver to be perfect for <200.. But that one looks like it comes close though.

Edit: got beat to the answer.

Agreed at $800 each these are of value but when you get up to 4 of them that putting you in a completely different price range. At $3200 there are other subs I would consider.

Exactly -- pretty impressive for a 'budget' driver. Data-Bass had this to say when they tested the prototype:

The response shape as a result is very smooth and will not require much shaping with linear response up well past 400Hz and down only 3dB at 165Hz. Indeed it appears that this driver could be used as the woofer in a three way crossed over as high as 350-400Hz.

Although it doesn't have a whole lot of use for what we will be using them for, awesome characteristic from a big beefy 18" subwoofer!

Bass Addict and I traded a few PM's around the beginning of December (after I paid for my 8) talking about how these things were getting ready to blow up. KaPow!!!

"Some" mcm's...that is a pretty tempting offer, but aren't the holidays over?

Aaron, I agree these drivers are gonna blow up.

Yeah Aaron, you called that one right. It seems that between the Daytons and SI's the DIY driver market has caught fire.

Trying to finalize my box dimensions. What I'm pretty settled on is a dual opposed, internal dimensions of 18.5 x 18.5 x 45.5. After driver displacement I'm right at 8.5 cubes for the pair before bracing and polyfil. They'd essentially be taller versions of these but configured the same (with about 7” space between drivers) and behind my mains.

Any foreseeable problems?

So these are low and long huh?

Are you using 18's. they are 18.5" wide. Leaves no room on the baffles.

Yes, 18s external dimensions 20” deep, 21” wide, 47” tall. Mounting depth is listed as 9.5” per driver so together 19”. Will I need to go to 22” wide?

Wait a minute. How many drivers in this one box? Four? I'm confused.

2 drivers per box dual opposed. Just like this but much taller and a little more wide and deep.

And the drivers would be situated more to the bottom of the box.

Ok. Wow. Those are going to be really tall. How thick are the walls? 21-18.5=2.5

I am also considering tall and "narrow" box. Not sure if it's going to be ffront firing or DO. I think the DO would be easier to brace. Mine will be even taller, approx 56" external, giving close to 6cu.ft per driver.

CHT SS18.2 look, the dual opposed version. Are you going to use yours as stands for the mains?

Yes cht look, 7” taller 2” wider. No, I wouldn't be using them as stands. My Mains would be situated about 8” ahead of the subs. Got some tight space to work with due everything being big. Big Mains and big subs. Brian, 3/4” ply all the way around with an extra 1/2” added for driver faces. I did that on my last build and without included rubber gasket, it recesses just a hair below the cabinet face.

The surround sticks out an additional 3/4" so you will have issues if you are intending on fabricating grills.

I'm still confused by the measurements. Your saying internal of 18.5 wide. 3/4 material. That sounds more like 20" wide right? Not 21"

No grills popalock, everything is hidden behind the screen. Brian 18.5” deep 3/4” per side to =20”. The other 18.5 equals out to 21” external because I'm using 1.25” per side for the driver baffles.

how much clearance between the drivers will be left in your design?

Based on that I'd guess 1".

Now I'm even more confused.

I think you mean 20" wide. Which is the driver face. And 21" deep. Which is the sides.

Lol yes that's it, got confused myself.

Yeah it does sound like your leaving 1" space between the drivers. That's pretty close. I'm not sure if that's going to be ok.

or none. he mentioned 1/2 extra ply on the baffles

edit: i see that it got sorted out already.

So 22” deep and I'm good?

I told my wife I was going to make an 18" Subwoofer. She wasn't at all excited- Oh well.

I was kind of going back and forth between ported and sealed.

Ported would be 31" x 23" x 22" I think. Sealed would be 28" x 20" x 21" (5 cubic feet net). Going from 5 cubic feet to 6 cubic feet gives me about 1 dB at 20 Hz and down. Not very significant. In all the modeling I've done, up to 800 watts ported or sealed, boosted or unboosted, I've never really came close to Xmax- which is fine, I guess.

Mainly I want a sub that passes the Tron Legacy test. Watch Tron Legacy from start to finish at -5 on my receiver while loudly reproducing the 10-30 Hz stuff and not bottoming out. Not a lot of commercial subs that can do that. My current sub can't either.