Mini Devastator 21" Version - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 120 Old 01-30-2020, 05:47 PM
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Mini Devastator 21" Version

Quote:
Originally Posted by johnson636 View Post
I have no idea where the go

Oh, I forgot to give you your credit for the Pipe insulation idea...That is sweet


Ya know, hatch bracing is the one pic I didn’t take from my dev build. I’ll have to remedy that on the next one.

Here’s the general idea, shorter one goes between the two verticals. “H” for hatch, lol.


Pipe insulation was a super simple yet effective solution. I will continue to use it in the future. Glad you liked/implemented it.

EDIT: Another pic that kinda shows hatch bracing:

@Red Five , got a pic?


Chris
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post #32 of 120 Old 01-30-2020, 05:59 PM - Thread Starter
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Quote:
Originally Posted by a77cj7 View Post
Pipe insulation was a super simple yet effective solution. I will continue to use it in the future. Glad you liked/implemented it.

Chris
Like it, I love it Don't be surprised if you start seeing more builds using pipe insulation. I used to use zip-ties to hold the wire in place, but your method is way more nicer
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post #33 of 120 Old 02-02-2020, 03:00 PM
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So my next build happened way sooner than expected, lol.

Hatch bracing:

Your version only has one horizontal, but same idea.

Chris
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post #34 of 120 Old 02-18-2020, 08:26 AM - Thread Starter
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Back at it again. I haven't cut the bracing yet" doing that once the box is glued together. I want to see where I went wrong last time so I don't repeat the same error.

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post #35 of 120 Old 02-18-2020, 09:17 AM
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Question

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Originally Posted by a77cj7 View Post
So my next build happened way sooner than expected, lol.

Hatch bracing:

Your version only has one horizontal, but same idea.

Chris
Why not a cross or an x brace on the hatch?

You guys are better than me. I would have made the front panel removable. I'm lazy like that.
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post #36 of 120 Old 02-18-2020, 10:30 AM
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Quote:
Originally Posted by BP1Fanatic View Post
Why not a cross or an x brace on the hatch?



You guys are better than me. I would have made the front panel removable. I'm lazy like that.


Easier to make a rear hatch than dealing with bracing for the front. Plus, no visible screws.

X bracing would work fine, The square or H is easier to install IMO.

Chris
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post #37 of 120 Old 02-18-2020, 01:34 PM - Thread Starter
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I'm not sure exactly what the hatch brace is reinforcing I can't make it out from the pics. At the moment, I don't have the hatch brace installed and I don't hear any ugly sounds from the enclosure. Now my room, that a totally different story. Windows, doors, joist, PJ all scream uncle

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post #38 of 120 Old 02-18-2020, 01:42 PM
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Quote:
Originally Posted by johnson636 View Post
I'm not sure exactly what the hatch brace is reinforcing I can't make it out from the pics. At the moment, I don't have the hatch brace installed and I don't hear any ugly sounds from the enclosure. Now my room, that a totally different story. Windows, doors, joist, PJ all scream uncle

Its to prevent the hatch panel from resonating.
Thats the reasoning behind all the cabinet bracing, preventing panel resonances, not reinforcement per se.

Chris
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post #39 of 120 Old 02-18-2020, 01:48 PM
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The 10" rule is a good rule of thumb to follow for bracing. Once you get beyond 10" from a brace or a corner the panels will start to resonate more than they should. The Devastators do not have half double thick baffles/manifolds, part of the bracing is reinforcement for the baffle wall, but most of it is making sure panels do not resonate in case the 130db+ output is fully utilized
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post #40 of 120 Old 02-18-2020, 01:56 PM - Thread Starter
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I'm aware of how the rest of the bracing prevents panel resonance, just not sure what the hatch brace is wedged against once installed. Anyhoot, my cab isn't resonating at the moment. At least I can't tell. That may change once I install the 21ds115

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Quote:
Originally Posted by johnson636 View Post
I'm aware of how the rest of the bracing prevents panel resonance, just not sure what the hatch brace is wedged against once installed. Anyhoot, my cab isn't resonating. At least I can't tell.
It's not wedges against anything... the hatch becomes STIFFER and thus less prone to resonance. The other way to fight resonances is to add MASS to the hatch....



Juju

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Got it. I'll add it once I install the 21ds115.

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Quote:
Originally Posted by johnson636 View Post
Got it. I'll add it once I install the 21ds115.
And don't forget to add a pillow as well.....


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A Pillow?

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Quote:
Originally Posted by johnson636 View Post
A Pillow?
Towards the back end of the experimental Quad thread. We have measurements!

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post #46 of 120 Old 02-18-2020, 05:00 PM - Thread Starter
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Quote:
Originally Posted by jujuman200 View Post
And don't forget to add a pillow as well.....


Juju
Quote:
Originally Posted by Red Five View Post
Towards the back end of the experimental Quad thread. We have measurements!
First I've heard of it. I haven't been following that thread.

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Actually, 2 pillows standing up inside the enclosure!

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post #48 of 120 Old 02-19-2020, 01:26 PM - Thread Starter
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Quote:
Originally Posted by BP1Fanatic View Post
Actually, 2 pillows standing up inside the enclosure!
Has the pillows been used in any of the other builds?

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Quote:
Originally Posted by johnson636 View Post
Has the pillows been used in any of the other builds?
Yes... I have 2 in my LFE and 1 in my Mini...


Juju

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Quote:
Originally Posted by jujuman200 View Post
Yes... I have 2 in my LFE and 1 in my Mini...


Juju
Pics?

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Quote:
Originally Posted by johnson636 View Post
Pics?
I have them stapled horizontally to the front to back braces....one pillow on the bottom and the other pillow on the mid braces...this is for the LFE.... The Mini has the pillow attached to the hatch behind the driver....


EDIT: https://www.avsforum.com/forum/155-d...l#post59247766

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pics?
Here ya go!
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Here are the measurements between no pillows (red) vs 2 standing pillows (orange).
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post #54 of 120 Old 02-19-2020, 05:01 PM - Thread Starter
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Quote:
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Here ya go!
Pillows in a ported enclosure...that's a first for me. How do you like the Rockville SPG88? I'm using a set as surrounds I wanted to try the SPGN108, but I was unsure if they would fit into my column.

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Quote:
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Here are the measurements between no pillows (red) vs 2 standing pillows (orange).
Looks like it cleans the FR from about 110hz - 200hz

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Quote:
Originally Posted by johnson636 View Post
Pillows in a ported enclosure...that's a first for me. How do you like the Rockville SPG88? I'm using a set as surrounds I wanted to try the SPGN108, but I was unsure if they would fit into my column.
I love them! You can't beat them for $92 a pair. I would like to try a 15" setup with 6 of them pole mounted to their 15" subs.
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post #57 of 120 Old 02-20-2020, 07:49 AM
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Wow, they are only showing the 12" speaker pole mounted to the 15" sub.
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Sony XBR65x900e / STR-DN1080 / original PS4 / WOW! Ultra TV / Quantum Access Mini PC Stick w/Windows 10 / 8 x Rockville SPG88 8“ DJ PA Speakers / Dayton Audio SA1000 / Kicker 08S15L74 in a Tapped-Tapered Quarter Wave Tube (negative flare tapped horn).
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post #58 of 120 Old 02-20-2020, 08:23 AM - Thread Starter
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Originally Posted by BP1Fanatic View Post
I love them!
Thought I was the only one

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 #59 of 120 Old 02-20-2020, 08:24 AM - Thread Starter
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Wow, they are only showing the 12" speaker pole mounted to the 15" sub.
I'm sure you could piece it together.

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 #60 of 120 Old 02-20-2020, 01:00 PM
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Talking

4 pairs of 15" two ways plus six 15" subs = $1,579.50!
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Sony XBR65x900e / STR-DN1080 / original PS4 / WOW! Ultra TV / Quantum Access Mini PC Stick w/Windows 10 / 8 x Rockville SPG88 8“ DJ PA Speakers / Dayton Audio SA1000 / Kicker 08S15L74 in a Tapped-Tapered Quarter Wave Tube (negative flare tapped horn).
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