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post #151 of 204 Old 04-25-2018, 09:58 AM
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Originally Posted by JCJetta View Post
...... so I don't think I'll have too much problem pressurizing the room.
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post #152 of 204 Old 04-30-2018, 03:47 PM
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First coat of paint is on.

Looking good Mike! Can't wait to see the finished product.
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post #154 of 204 Old 04-30-2018, 04:20 PM
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Looking good Mike! Can't wait to see the finished product.


Thanks me to these are turning out great! The only thing I’m worried about right now is the trim ring and angled pieces. I hope when I pull the tape of the paint doesn’t rip off with it. I used frog tape then blue tape on top of that.

Crossing my fingers
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post #155 of 204 Old 04-30-2018, 04:31 PM - Thread Starter
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Looking good Mike! Can't wait to see the finished product.
You ain't the only one.

And I screwed up. Purchased the tintable Duratex and didn't realize it until he showed me today. Mike to the rescue as he found a paint store to add lots of black... And as such the results you see.

So excited!

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post #156 of 204 Old 04-30-2018, 05:33 PM
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2 coats on! Getting close.... tomorrow I’ll throw a third and with the paint being wet I’ll pull the tape hopefully all goes well. Can’t wait to the these boxes in two different colors.
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post #157 of 204 Old 04-30-2018, 09:51 PM
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He'll yeah, that should look pretty sweet. @JCJetta Out of curiosity, what's the reason for the two colors?

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post #158 of 204 Old 05-01-2018, 05:02 AM
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He's a Indianapolis Colts fan (my guess lol)....

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post #159 of 204 Old 05-01-2018, 06:36 AM - Thread Starter
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The colors and design are subtle; black on black. Much of the enclosure faces will be covered by black velvet curtain eventually. The angles follow the barnwood in the rear of the room. I just didn't want the same old plain black face baffles as everyone else. There is little traditional about my theater; and now there is little traditional with my subs.

But I am one who enjoys watching excursion from time to time, which is why the drivers still may be visible in the theater. I can say I will miss the gentle breeze the front-firing ports of the 12” enclosures provided during heavy LFE, but certainly the extra extension and dee-bees will more than make up for it.

The completion of these boxes will get me around the corner toward 90% completion of the theater as I’ll be able to finish the screen wall off. Yet another thing to be excited about.
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post #160 of 204 Old 05-01-2018, 08:05 AM
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post #161 of 204 Old 05-01-2018, 09:45 AM
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Custom PSI Audio Platform 3 18s – Another Eng-399 Build

@JCJetta what do you think of them.

Final pictures of both boxes. Over all I’m happy there’s two spots that need to be touched up one is from the tape the other is area were the spray paint didn’t mate with the wood that good so I’ll brush that in thank god it’s on the bottom left side of one trim piece. The frog tape did a good job and made the paint line look perfect without any duratex bleeding through.

One thing that worked out is I use q-tips to block the area we’re the tnuts are so no paint would bleed through and mess up the threads.
I hope Jc is happy with these!
Off to the next build for me

[/IMG]

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post #162 of 204 Old 05-01-2018, 10:05 AM
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Originally Posted by Rowan611 View Post
7 sheets of BB is going to cost me $161 plus tax. It's from Liberty hardwood in Ankeny, IA. In MN, the same 5x5 BB was $45 a sheet. So, I kinda of know your pain.

Have you tried a program called Cutlist? I don't know what program you're currently using, but Cutlist is free and awesome.

Here's the link.

http://delphiforfun.org/programs/CutList.htm

Subscribed. Going to be another awesome build. Come up with a name yet?

Typed on a tiny keyboard, excuse any typos


Where were you able to find those Baltic Birch sheets in MN for $45?
I’m in the twin cities and have just stared my search?

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post #163 of 204 Old 05-01-2018, 10:12 AM
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Where were you able to find those Baltic Birch sheets in MN for $45?
I’m in the twin cities and have just stared my search?
Youngblood lumber; don't know what BB is now per sheet.

http://www.youngbloodlumber.com/

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post #164 of 204 Old 05-01-2018, 12:00 PM
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Originally Posted by eng-399 View Post
Final pictures of both boxes.


Off to the next build for me

I'm sure JC will be pleased. Those look great Mike.


I'll send my specs over later today!
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post #165 of 204 Old 05-01-2018, 12:12 PM
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post #166 of 204 Old 05-01-2018, 01:00 PM
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Those look great Mike!!

Typed on a tiny keyboard, excuse any typos
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post #167 of 204 Old 05-01-2018, 08:25 PM
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Originally Posted by mons0160 View Post
Where were you able to find those Baltic Birch sheets in MN for $45?
I’m in the twin cities and have just stared my search?
I got 8 sheets in Rochester @41 a piece few weeks ago. Two other places I called wanted 58 and 60. 5 X 5 sheets though.
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post #168 of 204 Old 05-05-2018, 05:30 AM - Thread Starter
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They are in the building!







Hope to load them Sunday and some REW trials... all depending on how much time my wife gives me.
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post #169 of 204 Old 05-05-2018, 05:42 AM
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They are in the building!















Hope to load them Sunday and some REW trials... all depending on how much time my wife gives me.


Looking good!!
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post #170 of 204 Old 05-05-2018, 07:23 AM
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Woohoo!!
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@eng-399 Simply Marvelous
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post #172 of 204 Old 05-05-2018, 08:36 AM
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Nice work, those cabs look great! Now we need to hear how they sound

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post #173 of 204 Old 05-06-2018, 10:37 AM - Thread Starter
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They are in.. almost.

Initial comments, impressions, no tuning yet.
*Substantially louder, lower than my 12s (well yeah, duh)
*One 18 was nearly as loud as both previous 12s
*I'm never using hurricane nuts again, they are junk. Replaced several with T Nuts - much better application for heavy drivers in ply.
*These subs are begging for way more power than my Inuke6k. Soon.
*The Penn-Elcom 2" machine screws aren't exactly great either; gotta replace a few.

Bottom line: these subs are amazing, the enclosures wring out every last bit of performance they can provide - but need much more power.
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post #174 of 204 Old 05-06-2018, 12:41 PM
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Can you explain the hurricane nuts thing? I don't remember which I used.
Are you getting a LG Clone?
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post #175 of 204 Old 05-06-2018, 01:11 PM - Thread Starter
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Hurricane nuts:


T-Nuts


T-nuts sunk right into the Baltic ply and I could torque down the screws with no issue. Several hurricanes came loose during my careful but firm tightening. Also lesson: avoid drinking a pot of coffee prior to doing the following actions:
*drilling out the foam surround area around the mounting holes
*placing the 65lb drivers into the baffle and lining up holes
*screwing the fasteners into the nuts

Near future amp upgrades; still picking between these two:
Pair of 2502s


SP2-8000


Teeny tiny price differnce between the two options that I'm currently weighing. Thank you to those I reached out to directly for consultation on this impending decision.
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Custom PSI Audio Platform 3 18s – Another Eng-399 Build

I still think for boxes like this you should be using these fasteners. Really not that pricey and you never have to worry about over tightening them (within reason).

I used them with my Ultimax UM18 in a sealed box and they worked great.

I will be using them on all 12, 12” drivers in my main room, including retrofitting an existing box.

https://www.avsforum.com/forum/155-di...l#post40276266


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post #177 of 204 Old 05-06-2018, 04:26 PM
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post #178 of 204 Old 05-06-2018, 04:46 PM
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The "premium" t-nuts from Parts Express are really nice.

https://www.parts-express.com/Search...itesearch=true

They have 6 teeth vs. the typical 4. I used them for my mains and center.
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post #180 of 204 Old 05-06-2018, 05:32 PM - Thread Starter
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This is the kit I used. The 5 or 6 Hurricane nuts I replaced the T-nuts from my kit work great now. I was able to torque down the drivers (using an automotive lug bolt start pattern of course). The only noise coming from the enclosures is bass. Sure a few of the screws are different colors, but at least Home Depot was able to provide hardware that worked.

Mike's workmanship and quality on these monsters is astounding. Don't hesitate to hire him, as he's truly a craftsmen who happens to be a basshead. But book your spot today as his build schedule is filling up fast!

But please let me reiterate how much of a dramatic improvement these 18" monsters are. I went from piston area of 113 sq in (x2) to 254 (x2). Next, I have much larger motors, voice coils, Xmax, and power handling than the 12s. Kind of a big deal. Now I'm hearing the lows I've heard on some of the Big Boy systems like Mike and Luke's. Sure I'm nowhere near the SPL, but enough to shake my seat (even more than the 12s did).

And again, my room is a soundproofed room-within-room 12x13. It's pretty small, which is why the 12s were actually plenty for the job. The soundproofing is being put to the test. The kitchen pots and pans are not happy with the upgrade, dishes in the sink will rattle, and text messages from the wife will appear on my phone more frequently now. That isn't just the increased in SPL, but more the lower frequencies penetrating the weaknesses in my room. And I feel those lower frequencies more too.

I think I'm gonna wait until my credit card period rolls over next week and order some more watts and the MiniDSP. What Phoenix-to-XLR plugs are you guys using? I know there's an 800 page MiniDSP thread... but it's an 800 page MiniDSP thread. Might even pick up a laptop so I don't have to lug my old gaming PC into the room for REW sweeps.
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