8x 18" LMS 5400 Ultras Sealed to 27 Cube 15hz Ported Build - Page 3 - AVS Forum
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Old 02-17-2014, 04:59 PM
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OCD is not my problem.... lack of tools, experience, and intelligence is. redface.gif
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Old 02-17-2014, 05:03 PM
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OCD is not my problem.... lack of tools, experience, and intelligence is. redface.gif

Remember, you can always have the home store rip your wood to widths and lengths you need for free. Then it is just a matter or assembly or at least only a couple rudimentary cuts.

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Old 02-17-2014, 05:14 PM
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Remember, you can always have the home store rip your wood to widths and lengths you need for free. Then it is just a matter or assembly or at least only a couple rudimentary cuts.

Yeah you are right. Still... you should have seen my flat pack assembly, it was bad enough. Maybe it wouldn't have been so bad if there weren't 8 of them..... I still have nightmares about PL glue. biggrin.gif
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Old 02-17-2014, 05:23 PM - Thread Starter
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Originally Posted by carp View Post

Yeah you are right. Still... you should have seen my flat pack assembly, it was bad enough. Maybe it wouldn't have been so bad if there weren't 8 of them..... I still have nightmares about PL glue. biggrin.gif

8 enclosures is a pain. That's part of the reason I'm building 4 wink.gif

I've been using regular tite-bond on these builds. I used titebond 2 on the front baffle (gluing the two boards together) since I didn't want it to tack too fast.

Anywhere there will be a large gap or you're not sure on the seal, then I used PL. Trick is keeping plenty of paper towels and gloves handy. Wear clothes you don't care about, too.

The only places in this build to get PL were the front baffle and the top since I had to make sure any gaps were sealed.

Has anyone worked with the new PL fast grab? It has my curiosity, but didn't want to try something new on this build.
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Old 02-17-2014, 05:24 PM
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Originally Posted by carp View Post

Yeah you are right. Still... you should have seen my flat pack assembly, it was bad enough. Maybe it wouldn't have been so bad if there weren't 8 of them..... I still have nightmares about PL glue. biggrin.gif

biggrin.gif PL is evil!
It usually takes it a week to wear off my hands even after doing most of with gloves...

But, the more you do the better you get.smile.gif

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Old 02-17-2014, 05:27 PM
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biggrin.gif PL is evil!
It usually takes it a week to wear off my hands even after doing most of with gloves...

But, the more you do the better you get.smile.gif

I hear ya, PL is the devil. I have a few extra "work rags" after messing with that stuff.

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Old 02-17-2014, 05:37 PM
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I hear ya, PL is the devil. I have a few extra "work rags" after messing with that stuff.

Yep! ...and work clothes!

Ugh! biggrin.gif

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Old 02-17-2014, 05:38 PM
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Yep! ...and work clothes!

Ugh! biggrin.gif

LOL, that's what I was implying. biggrin.gif

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Old 02-17-2014, 05:42 PM
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Has anyone worked with the new PL fast grab? It has my curiosity, but didn't want to try something new on this build.

Yup, although I use it for household stuff, it gets tacky and hard to remove anything in under 1 minute. I'll use it on my next build since I have 4 tubes I got for free.

Blasting brown notes for 10 years and counting!

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Old 02-17-2014, 05:44 PM
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LOL, that's what I was implying. biggrin.gif

I figured! But, I thought it was worth saying literally. OMG! That stuff eventually gets on everything!

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Old 02-17-2014, 05:44 PM - Thread Starter
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Yup, although I use it for household stuff, it gets tacky and hard to remove anything in under 1 minute. I'll use it on my next build since I have 4 tubes I got for free.

Sounds like it might be too quick for some box building. I'll probably pass on it, thanks for the info =]
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Old 02-17-2014, 05:44 PM
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cool trick I learned is to wrape a couple strips of duct tape around the tube before opening. this stop it from bowing out/spurting after you release pressure on the gun.
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Old 02-17-2014, 05:46 PM
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OK, no more ported talk. I've had my sealed setup running less than 8 months and I don't want to rebuild everything yet. cool.gif

I'd still not personally trade my sealed subs for ported ones. The hit of the horn is harder than any ported design I've ever seen. I like to have both in the HT personally.

Blasting brown notes for 10 years and counting!

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Old 02-17-2014, 05:50 PM
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I know I'm pretty excited to try out the large ported cabinets that I'm building, now I just need my damn UXL-18's to show up rolleyes.gif
Hopefully it'll they arrive before the end of the month smile.gif
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Old 02-17-2014, 06:04 PM - Thread Starter
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cool trick I learned is to wrape a couple strips of duct tape around the tube before opening. this stop it from bowing out/spurting after you release pressure on the gun.

Or just spend $5 instead of $3 on a gun and get one that pulls back wink.gif
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Old 02-18-2014, 04:16 AM - Thread Starter
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Old 02-18-2014, 05:57 AM
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Nice! One more to go.
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Old 02-19-2014, 02:54 AM - Thread Starter
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Nice! One more to go.

Almost, just put on coat of paint #2, need to flip it again and put one more on the top, then bring it inside and install the drivers and stuff... but soon... this build will not end frown.gif
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Old 02-19-2014, 05:34 AM
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Almost, just put on coat of paint #2, need to flip it again and put one more on the top, then bring it inside and install the drivers and stuff... but soon... this build will not end frown.gif

Your project definitely tips to the scale to the right considering size and work involved. You're doing it though, and of course it's looking really nice . At least with the ones you're building now you know how good they perform.

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Old 02-19-2014, 06:31 AM
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How is one of these compared to a GH?

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subs-12 SI 18's ported 6hz.
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Old 02-19-2014, 06:37 AM
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same ballpark. of course, smidgen more extension with the ~15hz ported cabs vs the ~17hz tuned tapped horn. excursion limited max spl is about the same in both cases. right around 126db +/- in the low 20's. gh is a little more sensitive compared to a dual ported cab, 3-5db depending where you measure. gh requires a little eq to smooth horn resonances. overall, pretty close.

Listen. It's All Good.
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Old 02-19-2014, 07:55 AM - Thread Starter
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http://www.data-bass.com/data?page=system&id=45&mset=42 for the GH, unfortunately I don't have similar measurements frown.gif

unfortunately I cant move 400+lb enclosures around to take gp measurements.

As for the simulations I posted, these subs were at least 3db more sensitive than my sealed. With the Denon subwoofer cal signal, I had to drop the gain on my amps by 3db to get it to match up, but this might be from less EQ needed in the MiniDSP. Once I get all 4 rolling, I'll have more/better info.
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Old 02-19-2014, 08:48 AM
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So these are more expensive with two drivers for similar performance BUT easier to build and less EQ required.

AVR-Yamaha A830
amps-5 Adcom 555 in 850 watt monoblock mode
sub amp-Sanway FP14K
LCR-Dual stacked BFM DR-250's
Surrounds- Dual stacked BFM W10's
subs-12 SI 18's ported 6hz.
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Old 02-19-2014, 09:01 AM - Thread Starter
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So these are more expensive with two drivers for similar performance BUT easier to build and less EQ required.

They dig a bit deeper as well, looking at the gjallerhorn measurements you can see it rolls off around 21-22hz. They can also be run to a higher frequency without horn issues. They'll require more power, but you'll get a bit more max output out of them as well I reckon.
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Old 02-19-2014, 09:11 AM
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Yes extension as well.

AVR-Yamaha A830
amps-5 Adcom 555 in 850 watt monoblock mode
sub amp-Sanway FP14K
LCR-Dual stacked BFM DR-250's
Surrounds- Dual stacked BFM W10's
subs-12 SI 18's ported 6hz.
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Old 02-19-2014, 01:03 PM
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OK, no more ported talk. I've had my sealed setup running less than 8 months and I don't want to rebuild everything yet. cool.gif

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Originally Posted by notnyt View Post

Uh oh... sounds like the seed is planted...


HAHA, I know! It's around the bend we go again. It's fascinating how the trends come and go in this arena we're in. Less than 6 months ago, tapped horns and folded horns were all of the rage. 6 months before that, major sealed builds were happening. Before that, LLT, etc. (all round-about time frames, of course). Now between Notnyt's progress and the gobs of Marty Subs cropping up, ported is now king for a day. It's awesome. The constant change here is really great. biggrin.gif

For me, I am good with my curvy sealed builds and wouldn't have room for anything large and ported anyway. cool.gif
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Old 02-19-2014, 02:01 PM
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For me, I am good with my curvy sealed builds and wouldn't have room for anything large and ported anyway. cool.gif

Keep telling yourself that until you don't believe it anymore. biggrin.gif

I must be guilty because people say I am guilty because they chose to call me guilty because they refuse to see the truth. Much easier to be part of the mob..
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Old 02-19-2014, 02:06 PM
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HAHA, I know! It's around the bend we go again. It's fascinating how the trends come and go in this arena we're in. Less than 6 months ago, tapped horns and folded horns were all of the rage. 6 months before that, major sealed builds were happening. Before that, LLT, etc. (all round-about time frames, of course). Now between Notnyt's progress and the gobs of Marty Subs cropping up, ported is now king for a day. It's awesome. The constant change here is really great. biggrin.gif

For me, I am good with my curvy sealed builds and wouldn't have room for anything large and ported anyway. cool.gif

It's a classic "grass is always greener " situation.

I'm skipping the ported and going from horns to infinite baffle, to stay ahead of the curve.
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Old 02-19-2014, 02:07 PM
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Keep telling yourself that until you don't believe it anymore. biggrin.gif

Lol! Yeah, you can bet that I've spent more than a few minutes pondering the placement possibilities of a couple of Marty Subs.
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Old 02-19-2014, 02:12 PM
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I think the Martycube would really interest a lot of guys. Forum member chalugado has a good post directly comparing the output of his full sized Marty sub to his martycube. It makes the cube very appealing, oh and with an SI driver with a inuke 3000 amp his marty cube crushed his HSU VTF-15V by almost 10dB @ 20hz from his measurements that he took. Not bad for about $600. smile.gif
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