Devastator an LTD02 hybrid design - Page 12 - AVS Forum | Home Theater Discussions And Reviews
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post #331 of 862 Old 09-05-2019, 04:23 AM
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Quote:
Originally Posted by Craig S King View Post
How many variations of the Devastator are we up to? I can't keep track of them anymore.
Variety is the spice of life lol. No I think theres 4. 3 for the 21 and 1 for a diffrent driver but I might be wrong

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post #332 of 862 Old 09-05-2019, 04:26 AM
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Originally Posted by hd0823 View Post
Variety is the spice of life lol. No I think theres 4. 3 for the 21 and 1 for a diffrent driver but I might be wrong

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Well you have the OG devastator,the larger version, the beast mode, the max, the MDM version, the LFE version, the WAF version and I believe that’s it. I could be missing some though. So what’s that 7?


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post #333 of 862 Old 09-05-2019, 05:12 AM - Thread Starter
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Devastator v1, LFE, BMD, BMD MAX which is not in final form. The SAF184.03 which is tweaked for that 18" woofer, though it will probably work well with other 18"s. Working on a PA460 MBM version. I have a lot of stuff sitting around waiting for someone to ask for it For the NSW I have tweaking that needs to be done to a few versions. The BMD MAX has roll off a little early, mid bass might suffer for it though performance below that will be stellar.

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post #334 of 862 Old 09-15-2019, 02:15 PM
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Started my build of the Devastator LFE yesterday. So far not too bad. I definitely like using Premium Loctite 3X more than Titebond II. PL is pretty easy to work with. The board don't slide as much with PL, which is good. Also no run of PL all the way down the panel, which is also good. Unlike glue which run down the panel to the floor. The only negative i have for PL is once you get it on your fingers it is hard to get it off. I will try using gloves next week.

Anyways so far i'm having fun...knock on wood i continue to have fun and have no issues.

Femi
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post #335 of 862 Old 09-15-2019, 03:27 PM - Thread Starter
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Quote:
Originally Posted by femi View Post
Started my build of the Devastator LFE yesterday. So far not too bad. I definitely like using Premium Loctite 3X more than Titebond II. PL is pretty easy to work with. The board don't slide as much with PL, which is good. Also no run of PL all the way down the panel, which is also good. Unlike glue which run down the panel to the floor. The only negative i have for PL is once you get it on your fingers it is hard to get it off. I will try using gloves next week.



Anyways so far i'm having fun...knock on wood i continue to have fun and have no issues.



Femi
I did the PL without gloves last time, the stuff takes off skin. Pick up a box of nitrile gloves, for $10 you can get 50 pairs if I recall correctly. Definitely worth the investment!
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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 #336 of 862 Old 09-15-2019, 05:56 PM
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Quote:
Originally Posted by femi View Post
Started my build of the Devastator LFE yesterday. So far not too bad. I definitely like using Premium Loctite 3X more than Titebond II. PL is pretty easy to work with. The board don't slide as much with PL, which is good. Also no run of PL all the way down the panel, which is also good. Unlike glue which run down the panel to the floor. The only negative i have for PL is once you get it on your fingers it is hard to get it off. I will try using gloves next week.



Anyways so far i'm having fun...knock on wood i continue to have fun and have no issues.



Femi


When I built mine I had glue all over my hands for like 4 days at work. Love building with it but man it’s nasty. The advice about the gloves is gold. I won’t touch it without it again.


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post #337 of 862 Old 09-16-2019, 04:41 PM
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Should the center point dimension of the baffle cutout for the LFE be 11.5'' down from the top of the access?

Thanks,
Femi

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post #338 of 862 Old 09-17-2019, 04:25 AM - Thread Starter
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Quote:
Originally Posted by femi View Post
Should the center point dimension of the baffle cutout for the LFE be 11.5'' down from the top of the access?



Thanks,

Femi
It's 11.81 inches from the end of the baffle to center, which is 11 and 13/16ths. Kyle and Jeremy have both used the length.
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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 #339 of 862 Old 09-17-2019, 02:51 PM
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I have talked myself into building a GSG Dev with the new Eminance 21". This will supplement my 2 GSG Full Martys. Anything I should worry about before getting started?

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post #340 of 862 Old 09-17-2019, 03:28 PM - Thread Starter
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Originally Posted by nexus99 View Post
I have talked myself into building a GSG Dev with the new Eminance 21". This will supplement my 2 GSG Full Martys. Anything I should worry about before getting started?
Just follow directions is the biggest thing and pay attention to the shopping list. Depending on power source port velocity gets up there, but it looks worse on the BMD and that has been working out fine for Kyle.

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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 #341 of 862 Old 09-17-2019, 04:13 PM
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Quote:
Originally Posted by Red Five View Post
Just follow directions is the biggest thing and pay attention to the shopping list. Depending on power source port velocity gets up there, but it looks worse on the BMD and that has been working out fine for Kyle.


Yup I think you will absolutely love it. I just got finished playing bass I love you with my back against the face of the BMD sitting on the floor. I played it so loud that ever single note was felt resonating through my body. To the point that it was likely not smart haha. (But it was awesome) I didn’t hear any port noise at all. The only time I have ever been able to audibly hear the ports was a constant sine wave in REW at 18.5hz-19hz(which should be right at the peak velocity). When I did this is was pretty audible but it was also basically equally audible using the lavoce driver at the same frequency. Since that’s not why we are building I doubt you will hear any port noise.




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post #342 of 862 Old 09-17-2019, 06:21 PM
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@LTD02 said the eminence driver will be fine in a devastator. my 2 gsg devastators showed up today, hopefully get to start on them on friday
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post #343 of 862 Old 09-17-2019, 06:47 PM - Thread Starter
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Originally Posted by superkyle View Post
Yup I think you will absolutely love it. I just got finished playing bass I love you with my back against the face of the BMD sitting on the floor. I played it so loud that ever single note was felt resonating through my body. To the point that it was likely not smart haha. (But it was awesome) I didn’t hear any port noise at all. The only time I have ever been able to audibly hear the ports was a constant sine wave in REW at 18.5hz-19hz(which should be right at the peak velocity). When I did this is was pretty audible but it was also basically equally audible using the lavoce driver at the same frequency. Since that’s not why we are building I doubt you will hear any port noise.




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This could start an argument. Thinking about the port velocity there a couple things that came to mind. If you have noise from a port pushing 35m/s and the subs output is 110db when that speed occurs the delta between port noise and fundamental sound will be much smaller than a sub pushing 125db as an example.

Content has many frequencies happening simultaneously, unlike a sine wave test. The frequency of the air noise is most likely higher in the bass frequencies. I would be curious where the noise would show up in the spectrum from the port when running the high teen sine wave. Chances are a lot of content might be in that region and if the delta is more than 20db your ear would have a very hard time picking it out. I am all for a good blast of air as things bottom out in a scene, great for more TR

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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 #344 of 862 Old 09-17-2019, 06:52 PM
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Will the low end advantage of the Eminence be realized in the Devastator?

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post #345 of 862 Old 09-17-2019, 07:51 PM
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@gpmbc

the devastator is a combination of horn on the upper end and ported on the lower end. the bottom end behaves quite similarly to a big ported cab tuned to around 19hz.

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post #346 of 862 Old 09-17-2019, 07:56 PM
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@LTD02 so even more low end authority with the Eminence. What would the usable output be under 19hz?
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post #347 of 862 Old 09-18-2019, 04:31 AM
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Quote:
Originally Posted by Red Five View Post
This could start an argument. Thinking about the port velocity there a couple things that came to mind. If you have noise from a port pushing 35m/s and the subs output is 110db when that speed occurs the delta between port noise and fundamental sound will be much smaller than a sub pushing 125db as an example.

Content has many frequencies happening simultaneously, unlike a sine wave test. The frequency of the air noise is most likely higher in the bass frequencies. I would be curious where the noise would show up in the spectrum from the port when running the high teen sine wave. Chances are a lot of content might be in that region and if the delta is more than 20db your ear would have a very hard time picking it out. I am all for a good blast of air as things bottom out in a scene, great for more TR


I completely agree. I’m not sure you could argue that. The port velocity peaks at 35m/s but as you said is in the 125db range when that occurs. The port noise is well below this so likely is drowned out and becomes “invisible” despite still being there due to other frequencies being played at the same time. Looking at the port velocity the only area of concern would be around 16-21hz not a very wide band at all which leans to the theory of being drowned by other frequencies but audible during standing sine wave testing.

I think one test that needs to be done with the eminence is compression sweeps. The port noise I can say is a non factor IMO since I can’t even make it happen if I try. However compression in the low end may exist. I know to test this you just run sweep after sweep increasing the db each time and looking for it but I’m not sure how to keep the mic from clipping. If anyone doesn’t mind helping me learn how to do these sweeps I would be happy to test it out when I have time and post the results.

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post #348 of 862 Old 09-18-2019, 06:29 AM - Thread Starter
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For the curious Devastator v1 with the NSW 18Hz 2nd order HPF 94 volts ~2300 watts.





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post #349 of 862 Old 09-18-2019, 06:50 AM - Thread Starter
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Devastator LFE with the NSW 19Hz 2nd order HPF 96 volts ~2400 watts. Air velocity is getting gnarly on the LFE 42m/s . This design could use some tweaks to better accommodate the NSW. Either getting taller for a bigger port, getting wider for a bigger port and shallower depth or making the resonator shorter pushing the bell curve further up in the response and then adding that height to the port.




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Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
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 #350 of 862 Old 09-18-2019, 10:30 AM
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I am getting in line for the Eminence 21 and as soon as that comes I'll get straight into the build. I have the GSG flatpack in my garage now. And for those that know me I will document the build with a video and assorted photos. It should be a fun effort.

I just have to figure out how to get this thing down the stairs to the basement!!!!

Maybe there are some other CO folks here that want to come play one day in the future!

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post #351 of 862 Old 09-18-2019, 10:35 AM
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From an amplification point of view I have a channel from a iNuke 6000 or a bridged Crown 1502 available today.
Obviously I can feed quite a bit more power into this speaker. I'll comb through the forums posts but has there been any consensus on the "accepted" amplification solutions for this speaker/enclosure combo?

Similar to how many people have found success with the 2x full marty, UM18 drivers, and iNuke 6000 kit.

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post #352 of 862 Old 09-18-2019, 11:02 AM - Thread Starter
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Quote:
Originally Posted by nexus99 View Post
From an amplification point of view I have a channel from a iNuke 6000 or a bridged Crown 1502 available today.
Obviously I can feed quite a bit more power into this speaker. I'll comb through the forums posts but has there been any consensus on the "accepted" amplification solutions for this speaker/enclosure combo?

Similar to how many people have found success with the 2x full marty, UM18 drivers, and iNuke 6000 kit.

The NSW6021 can be driven well off of an NX. A 6000 has to share its power supply, so sustained power will be closer to 78 volts both channels driven vs 91 volts with a single channel driven. You can look at the iNuke6000 amp rundown thread for the specifics. Bridged 3000s would be a good match since 94 volts pushes good excursion out of the Devastator v1. 91 volts is sustained power, there is more power in the tank for bursts.

Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
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 #353 of 862 Old 09-18-2019, 11:05 AM
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Quote:
Originally Posted by Red Five View Post
The NSW6021 can be driven well off of an NX. A 6000 has to share its power supply, so sustained power will be closer to 78 volts both channels driven vs 91 volts with a single channel driven. You can look at the iNuke6000 amp rundown thread for the specifics. Bridged 3000s would be a good match since 94 volts pushes good excursion out of the Devastator v1. 91 volts is sustained power, there is more power in the tank for bursts.
Thanks for the detail. A bridged 3000 sounds like a good match for me. I am familiar with the hardware and the cost point is right in line!

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post #354 of 862 Old 09-18-2019, 11:15 AM
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Thanks for the detail. A bridged 3000 sounds like a good match for me. I am familiar with the hardware and the cost point is right in line!


So I actually went through exactly what you are doing now. The bridges 3000 is an excellent solution. Personally I ended up going with the FP14000 which is a good but more powerful just to ensure I can send all the power the woofer could handle. This is a clone and comes with some risks but it’s a well documented and tested clone. Worth checking out as a high power solution.


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post #355 of 862 Old 09-19-2019, 04:45 AM
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Quote:
Originally Posted by femi View Post
Started my build of the Devastator LFE yesterday. So far not too bad. I definitely like using Premium Loctite 3X more than Titebond II. PL is pretty easy to work with. The board don't slide as much with PL, which is good. Also no run of PL all the way down the panel, which is also good. Unlike glue which run down the panel to the floor. The only negative i have for PL is once you get it on your fingers it is hard to get it off. I will try using gloves next week.

Anyways so far i'm having fun...knock on wood i continue to have fun and have no issues.

Femi
Would be great if you can share the build thread. First page had the cut list and some pics but as a newbie, I feel like Devastator thread is missing some detail build threads. I'm also looking into building v1 Devastator and the build thread will surely help out.
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post #356 of 862 Old 09-19-2019, 05:59 AM
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Originally Posted by harrisu View Post
Would be great if you can share the build thread. First page had the cut list and some pics but as a newbie, I feel like Devastator thread is missing some detail build threads. I'm also looking into building v1 Devastator and the build thread will surely help out.

Let the devastation begin dual devastator build
https://r.tapatalk.com/shareLink?sha...6&share_type=t


Dual Beast Mode Devastator Build and Integration
https://r.tapatalk.com/shareLink?sha...2&share_type=t

There are two that may help you out. I tried to be fairly detailed in mine. I always agree that more are better but those two should get you started.

Always destroying exergy!
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post #357 of 862 Old 09-19-2019, 08:43 AM
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Originally Posted by superkyle View Post
Let the devastation begin dual devastator build
https://r.tapatalk.com/shareLink?sha...6&share_type=t


Dual Beast Mode Devastator Build and Integration
https://r.tapatalk.com/shareLink?sha...2&share_type=t

There are two that may help you out. I tried to be fairly detailed in mine. I always agree that more are better but those two should get you started.
@hd0823 is soooo cool. I am in touch with him. Got on phone and had very pleasant conversation with him. Wish I could visit his HT. May be I'll book a ticket and fly out to hear his system . He'll help me out with the built as well. But the point I really was trying to make is to have 1 build thread that can help all with easy steps to follow. I'll try to do that but since I'm not a pro, I might end up making some mistakes. I'm planning to build two Devastators :-).
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post #358 of 862 Old 09-19-2019, 08:48 AM
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Originally Posted by harrisu View Post
@hd0823 is soooo cool. I am in touch with him. Got on phone and had very pleasant conversation with him. Wish I could visit his HT. May be I'll book a ticket and fly out to hear his system . He'll help me out with the built as well. But the point I really was trying to make is to have 1 build thread that can help all with easy steps to follow. I'll try to do that but since I'm not a pro, I might end up making some mistakes. I'm planning to build two Devastators :-).


Yes he is super helpful and a valuable contributor to the forum. Did you take a look at the first post on my build thread? I didn’t explain everything but I did try and highlight the important parts. If you have any specific questions feel free to post them up and I’m certain any of us who have built one will be happy to help.


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post #359 of 862 Old 09-19-2019, 09:14 AM
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Originally Posted by superkyle View Post
Yes he is super helpful and a valuable contributor to the forum. Did you take a look at the first post on my build thread? I didn’t explain everything but I did try and highlight the important parts. If you have any specific questions feel free to post them up and I’m certain any of us who have built one will be happy to help.


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Thanks both of you for the kind words. Yeah detailed build threads arent my strong point but I'll answer anyone's questions that need help the number one question I get PM's for on the devastors is the order which I assembled everything. I've been debating going back and putting it in the thread might help people out. plus one thing for people to think about is the order could be different if using clamps. I always try to reccomend people to buy a kregg jig it literally shaves off hrs of waiting for things to dry.

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post #360 of 862 Old 09-19-2019, 01:00 PM
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Originally Posted by superkyle View Post
Yes he is super helpful and a valuable contributor to the forum. Did you take a look at the first post on my build thread? I didn’t explain everything but I did try and highlight the important parts. If you have any specific questions feel free to post them up and I’m certain any of us who have built one will be happy to help.


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Yeah was just checking out. Cool build. Will definitely help but I'm sure I"ll have questions once I start mine.

Quote:
Originally Posted by hd0823 View Post
Thanks both of you for the kind words. Yeah detailed build threads arent my strong point but I'll answer anyone's questions that need help the number one question I get PM's for on the devastors is the order which I assembled everything. I've been debating going back and putting it in the thread might help people out. plus one thing for people to think about is the order could be different if using clamps. I always try to reccomend people to buy a kregg jig it literally shaves off hrs of waiting for things to dry.

Sent from my SM-N950U using Tapatalk
You know I"m really thinking that I should go with Plywood instead of MDF for 2 reasons
1 - I will be able to use Jig Pocket Hole System.
2 - It will be much lighter in weigh to move around.
3 - Cutting MDF makes my whole garage covered with MFD dust. Hopefully, won't be the case with Plywood.

For Pocket hole system, does this look good? https://www.amazon.com/Kreg-R3-Pocke...8923084&sr=8-5. I have never used it but should be easy enough to get going.
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