The Silencer Devastator + Phantom Devastator MBM Build Thread - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 33 Old 01-07-2020, 04:32 PM - Thread Starter
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The Silencer Devastator + Phantom Devastator MBM Build Thread

Hi all,

For starters, huge thanks to @Red Five for working with me on this project. He cranked out two custom order Devastator’s for me, and I haven’t even built them but I know what is coming so I have a huge smile on my face.

Next would be @LTD02 , for creating the Devastator.

Anyone else who helped in the creation, thank you.

Next, the actual Devastator. Devastators. Heh.

I was considering making two separate threads but then I said why not condense it since they go hand in hand with each other

So here I am.

You guys are probably sick of seeing all of these Devastators, but here you go:



This will house the UM18, and will be referred to as the Silencer for most of the thread.



This will house the PA460, and be referred to as the Phantom or MBM for the duration of the thread.





Here is how horn resp says they’ll talk. I’m praying to the subwoofer gods that I don’t have extreme phase issues at the crossover point (will need to be 50-60hz). Because... the Phantom is built to fit *on top* of the Silencer

I’ll begin cutting the MDF this week, starting with the smaller panels. I only have Handy-Panels right now, not full size sheets. I have the cut lists, along with Red Five and can attach them if anyone wants. I’m going to put all of the Silencer info into John’s original “Anyone bored with their UM18 and want to try something new?” thread. He (We?) is technically on v3 of the design.

Can’t give you an estimate on how long it’ll take me to do both, and I’m going to really try my best not to rush anything so this comes out fantastic, so we’ll see how long, but given I can work about 2 hours a day in the woodshop, I don’t think it’s unreasonable to say under 3 weeks

Additional info will be attached as soon as possible.

Stay tuned!



Edit: As I said, I've attached some more info.
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Leave it at 8 ohms and call it a day :)

Last edited by Russdawg1; 01-08-2020 at 02:46 AM.
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post #2 of 33 Old 01-07-2020, 04:49 PM
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Dimensions/models of the Phantom? Color me curious...

Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

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post #3 of 33 Old 01-07-2020, 04:53 PM - Thread Starter
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Quote:
Originally Posted by smcmillan2 View Post
Dimensions/models of the Phantom? Color me curious...



Here you go, I swear the other photo had dimensions.
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Leave it at 8 ohms and call it a day :)
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post #4 of 33 Old 01-07-2020, 05:55 PM
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The MBM is designed to fit the space requirement and stack. Instead of doing a box inception maneuver with two boxes in one they are modular. Both should peak at about 123db assuming response is EQd flat and the room does nothing. 1700 watts should be about peak for the UM and 500 watts or so for the PA460. A 30Hz 2nd order HPF should keep excursion in check on the Phantom, but for phasing that might have to move up. Silencer can use a 16Hz 2nd Order HPF. Tune on that is about 18Hz.

The Silencer is a dual Helmholtz Resonator configuration and the Phantom is a quarter wave + Helmholtz resonator. Yes, more Star Wars craft references!
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You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
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post #5 of 33 Old 01-07-2020, 06:12 PM
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Quote:
Originally Posted by Red Five View Post
The MBM is designed to fit the space requirement and stack. Instead of doing a box inception maneuver with two boxes in one they are modular. Both should peak at about 123db assuming response is EQd flat and the room does nothing. 1700 watts should be about peak for the UM and 500 watts or so for the PA460. A 30Hz 2nd order HPF should keep excursion in check on the Phantom, but for phasing that might have to move up. Silencer can use a 16Hz 2nd Order HPF. Tune on that is about 18Hz.

The Silencer is a dual Helmholtz Resonator configuration and the Phantom is a quarter wave + Helmholtz resonator. Yes, more Star Wars craft references!
I have a lot of other things to try first, but I am definitely interested in that Phantom so I may be hitting you up in the future for more information!

Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

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post #6 of 33 Old 01-08-2020, 02:42 AM - Thread Starter
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So I've converted Red's cut-list to a panel cut-drawing using the fantastic CUTLIST400.

Love that name.

Came to 1 Full Panel, and 8 Handy-Panels for both subwoofers. Not bad. It might be easier to do it with multiple full panels instead of Handy-Panels but we have quite a few in the shop at the moment.
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Leave it at 8 ohms and call it a day :)
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post #7 of 33 Old 01-08-2020, 12:25 PM - Thread Starter
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The Silencer Devastator + Phantom Devastator MBM Build Thread

In about 25 minutes I was able to cut panels 2-7.



Full sheet is on the way.

I’ll tackle panels 8 and 9 at lunch. I should be able to start assembly of the Phantom MBM tomorrow?

I’ll be doing glue+brads. Unless anyone has a better idea?

Leave it at 8 ohms and call it a day :)
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post #8 of 33 Old 01-08-2020, 12:41 PM
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Originally Posted by Russdawg1 View Post
I’ll be doing glue+brads. Unless anyone has a better idea?
Don't know about "better idea" but pocket screws are handy

Automation: Alexa- Harmony Hub- Wemo Dimmer Switch- Wemo Smart Plug BatCave: SY Triple Black
Video Image: JVC RS500- Sony UBP-800X- Chromecast- 125" wide 16x9 white over black spandex screen
Audio: 5.2.4 Marantz SR7011- (LCR) QSC 2180 - (Surrounds) (4) BIC FH6-LCR- (Atmos) (4) Dayton Audio B652 6-1/2-Inch- (Subs)2 23ishcuft ported HS24s 14-15Hz tune - 2 Devastator Minis B&C21ds115 - 4 PA460 in ported cabs 40Hz tune- FP20000Q- 2 Sanway FP10000Q- Crown XLS1500- . To be continued...
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post #9 of 33 Old 01-08-2020, 12:43 PM
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Quote:
Originally Posted by Russdawg1 View Post
In about 25 minutes I was able to cut panels 2-7.



Full sheet is on the way.

I’ll tackle panels 8 and 9 at lunch. I should be able to start assembly of the Phantom MBM tomorrow?

I’ll be doing glue+brads. Unless anyone has a better idea?

How fast are you planning on going? Brad nails are great if you do a panel here and there, but if you want to do a lot of assembly quickly two screws holding a panel in place while the glue sets is better, if the panel is really large maybe go with four. If you are using MDF do not forget to pre-drill holes. Personally I like the PL3X since it has a long working time to adjust if you goof, you seriously have a half hour. It sets pretty hard in 8 hours and is indestructible in about 24 hours. It can fill voids well if something is not perfect.

Stormbreaker | WI HT Meet Thread | The Devastator Index | Mini Devastator Build
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.2.4 | A3070 | XLS 1502 | 3000DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen | 2x Mini Devastators
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post #10 of 33 Old 01-08-2020, 01:14 PM - Thread Starter
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Originally Posted by Red Five View Post
How fast are you planning on going? Brad nails are great if you do a panel here and there, but if you want to do a lot of assembly quickly two screws holding a panel in place while the glue sets is better, if the panel is really large maybe go with four. If you are using MDF do not forget to pre-drill holes. Personally I like the PL3X since it has a long working time to adjust if you goof, you seriously have a half hour. It sets pretty hard in 8 hours and is indestructible in about 24 hours. It can fill voids well if something is not perfect.

I don’t plan on blasting through it but I thought with enough brad nails, I would be safe to move to the next step right there, not having to wait for the glue to dry.

Screws can be done, but brad nails are lower profile and easier for me I guess.

Leave it at 8 ohms and call it a day :)
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post #11 of 33 Old 01-08-2020, 01:22 PM
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I don’t plan on blasting through it but I thought with enough brad nails, I would be safe to move to the next step right there, not having to wait for the glue to dry.

Screws can be done, but brad nails are lower profile and easier for me I guess.

About that, using a lot of brad nails and moving it, stuff shifted slightly on mine when I did that. That is why I am making the use screws for that recommendation or let the glue set longer.

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You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.2.4 | A3070 | XLS 1502 | 3000DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen | 2x Mini Devastators
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post #12 of 33 Old 01-08-2020, 01:58 PM - Thread Starter
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The Silencer Devastator + Phantom Devastator MBM Build Thread

Man it takes so much longer than I remember to make small piece bracing.



I’m at like 30/52 parts complete?

Leave it at 8 ohms and call it a day :)

Last edited by Russdawg1; 01-08-2020 at 02:03 PM.
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post #13 of 33 Old 01-08-2020, 02:00 PM - Thread Starter
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About that, using a lot of brad nails and moving it, stuff shifted slightly on mine when I did that. That is why I am making the use screws for that recommendation or let the glue set longer.

Screws it is! I’ll likely use a bit more than 2 for complete tanky-ness.

Leave it at 8 ohms and call it a day :)
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post #14 of 33 Old 01-08-2020, 02:03 PM
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About that, using a lot of brad nails and moving it, stuff shifted slightly on mine when I did that. That is why I am making the use screws for that recommendation or let the glue set longer.


I actually like that I can shift it with brads and PL, allows me to square everything up perfectly once assembled.

I had one joint spread when I flipped a cabinet, luckily I noticed and was able to clamp it.

Chris
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post #15 of 33 Old 01-08-2020, 02:04 PM - Thread Starter
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I actually like that I can shift it with brads and PL, allows me to square everything up perfectly once assembled.

I had one joint spread when I flipped a cabinet, luckily I noticed and was able to clamp it.

Chris

Okay maybe not screws it is.

We’ll get the parts cut and see where we end up.

Leave it at 8 ohms and call it a day :)
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post #16 of 33 Old 01-08-2020, 02:36 PM
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I updated the Index and added this build thread

Stormbreaker | WI HT Meet Thread | The Devastator Index | Mini Devastator Build
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.2.4 | A3070 | XLS 1502 | 3000DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen | 2x Mini Devastators
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post #17 of 33 Old 01-08-2020, 02:43 PM - Thread Starter
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I updated the Index and added this build thread

I’ve made it!

Leave it at 8 ohms and call it a day :)
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post #18 of 33 Old 01-09-2020, 12:15 AM - Thread Starter
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For fun, I decided to redraw the CAD files supplied from Red Five in FreeCAD to AutoCAD.

I've always liked their X-Ray view mode.

The Silencer is a little more difficult to copy, so I only have the Phantom complete at the moment.
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post #19 of 33 Old 01-19-2020, 12:44 PM - Thread Starter
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Whoops, forgot to tell you guys I got my sheet in last week. Started cutting it, I’m about 3 pieces out from being finished.

Leave it at 8 ohms and call it a day :)
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post #20 of 33 Old 01-19-2020, 04:41 PM
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Nice powermatic planer - I miss mine.
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post #21 of 33 Old 01-19-2020, 05:05 PM - Thread Starter
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Nice powermatic planer - I miss mine.

I had to replace all 108 something blades on it. Not fun. :P

Leave it at 8 ohms and call it a day :)
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post #22 of 33 Old 01-19-2020, 05:53 PM
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Yeah, replacing the blades wouldn't be fun, but it'll probably be 25 years until you need to do it again, depending on use.
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post #23 of 33 Old 01-19-2020, 06:10 PM - Thread Starter
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Yeah, replacing the blades wouldn't be fun, but it'll probably be 25 years until you need to do it again, depending on use.

I do think it’s cool how the blades are 4 sided and can be turned 90 degrees to restore the blade back to pristine cutting ability. It’s just doing that 108 times that gets annoying.

I can only imagine the poor soul who when all 4 sides are run through, has to physically remove and replace all the blades :P

I only rotated them

Leave it at 8 ohms and call it a day :)
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post #24 of 33 Old 01-20-2020, 11:11 AM
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I assume you had these speakers already?
Flat at 123db from 50 to 200hz (that’s a pretty bad arse MBM @redfive ) and keeping it flat down to 20hz.... I hope you have some good mains to keep up? And are you going to give us a hint of where they are going, maybe a picture of the room?

BTW, I used brad nails and screws too. Brad nails after clamps and glue to keep things from moving then screws after everything was lined up. Brad nails and glue only for port braces so no boards split.
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I assume you had these speakers already?
Flat at 123db from 50 to 200hz (that’s a pretty bad arse MBM @redfive ) and keeping it flat down to 20hz.... I hope you have some good mains to keep up? And are you going to give us a hint of where they are going, maybe a picture of the room?

BTW, I used brad nails and screws too. Brad nails after clamps and glue to keep things from moving then screws after everything was lined up. Brad nails and glue only for port braces so no boards split.

I like to think I have some decent mains. Ascend CMT340’s.

My room is just a small 10x10 bedroom nothing special. It’s not even a surround system. Just 2.1 heh. The sub sits in my closet, out of the way of everything.

Leave it at 8 ohms and call it a day :)
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post #26 of 33 Old 01-21-2020, 11:57 AM - Thread Starter
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So here we have all the MDF cut. Onto the 2x4!

Leave it at 8 ohms and call it a day :)
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post #27 of 33 Old 02-18-2020, 04:47 PM - Thread Starter
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The Silencer Devastator + Phantom Devastator MBM Build Thread

So I’ve been sort of distracted lately admittedly.

I got a 3D printer, an Ender 3, and I’ve been having a field day with that thing.

Printing model weapons, functional weapons, tools, figures, you name it.

I’m waiting on 2x4’s right now, our shop had a few but not long enough. I promise I’ll get it done!

But for now check out this AR15 Lower I printed in PLA for a friend:

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Leave it at 8 ohms and call it a day :)

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post #28 of 33 Old 02-18-2020, 05:27 PM
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But for now check out this AR15 Lower I printed in PLA for a friend
Ghost gun.

Not the forum for it, but do you have plans for an upper?

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post #29 of 33 Old 02-18-2020, 05:40 PM - Thread Starter
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Ghost gun.



Not the forum for it, but do you have plans for an upper?

Ghost gun indeed. And it’s legal since it classified as an 80%. My friend will likely complete it and either register it or keep it spooky

I do not have plans for an upper, and distribution of them is supposedly illegal with the latest court ruling. They made DefenseDistributed take down their whole database. They would have had plans galore.

I’m not really a gun guy but I thought it was a cool print and was happy to do it.
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Leave it at 8 ohms and call it a day :)
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post #30 of 33 Old 02-18-2020, 06:12 PM
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Ghost gun indeed. And it’s legal since it classified as an 80%. My friend will likely complete it and either register it or keep it spooky

I do not have plans for an upper, and distribution of them is supposedly illegal with the latest court ruling. They made DefenseDistributed take down their whole database. They would have had plans galore.

I’m not really a gun guy but I thought it was a cool print and was happy to do it.
Understand. I was able to get a really nice upper from Hardened Arms in WA before they went under. PSA still offers good uppers as well.

Anywho. Back to DIY Speakers and Subwoofers...

Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

Speaker builds: DIYSG HTM-10 build | DIYSG Volt-6 build | DIYSG Fusion-8 builds
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