Devastator an LTD02 hybrid design - Page 25 - AVS Forum | Home Theater Discussions And Reviews
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post #721 of 879 Old 10-10-2019, 06:20 AM
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Originally Posted by superkyle View Post
14 of those sheets seems to me like it equals two mini devs glad to see you decided to just go for two instead of try one then build another. I can speak from experience that once I heard the first one I was glad the second one was already build bc it was jam time lol


Yup. Figured it would be way less work just to cut enough for two. Table saw makes repeatable cuts easy. Plus, less than $100 material per box. MDF was 35 bucks a sheet after tax.

Besides, I gotta have symmetry under my screen, so If I’m using a dev variant, it’s gotta be two of them.
I will wait to order the second driver till I hear the first one though. That’s the expensive part. They’re proud of 18ds115’s.

Chris


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post #722 of 879 Old 10-10-2019, 06:25 AM
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Hmm Menards is six minutes from my house, Lowe's is 30 minutes, but if they will do three cuts for free for me, might be worth the trip!

The lowes mdf looks much nicer than the menards stuff too. Menards is a grayish brown, lowes is the nice yellow. I’ll snap a comparison pic when I get home. Not sure if it matters, but still.
Chris


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post #723 of 879 Old 10-10-2019, 08:08 AM
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@Red Five . It looks like your mini design file is showing 1.68 down from top of baffle to driver cutout. Its kinda hard to read. That would make center of driver 10” exactly from top of baffle. Is this correct?
Thanks,
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post #724 of 879 Old 10-10-2019, 08:41 AM - Thread Starter
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Quote:
Originally Posted by a77cj7 View Post
@Red Five . It looks like your mini design file is showing 1.68 down from top of baffle to driver cutout. Its kinda hard to read. That would make center of driver 10” exactly from top of baffle. Is this correct?
Thanks,
Chris


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Yes, radius on the cutout is 8.32 when I looked on PE so that should equal 10 inches even.

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).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #725 of 879 Old 10-10-2019, 08:45 AM
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Originally Posted by Red Five View Post
Yes, radius on the cutout is 8.32 when I looked on PE so that should equal 10 inches even.


Awesome, thanks

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post #726 of 879 Old 10-10-2019, 09:23 AM
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9each 5’x5’ Baltic birch plywood is all bought and in my garage. Ordered the 1/2” plexiglass window/front panel. Looking forward to the weekend to make some sawdust!!!

What Pl adhesive should I buy since I am going to stain the entire enclosure?
What would that 1/2" Plexiglass look like? I'd love to replace that panel with this Plexiglass if it can make my driver visible . Also, are you planning to put that on the front or back? Back, I can easily replace but front is glued so that won't work .
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post #727 of 879 Old 10-10-2019, 09:42 AM
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I am also intrigued by the plexiglass idea. I just called my local glass shop, and they don’t have 3/4, but they do have 1/2.
@Red Five . I’d have to add mdf supports around the perimeter of the front chamber to screw the plexi to. Would this affect the horn tuning much? Say a 3/4” x 1” strip on all three sides.

Thanks,
Chris


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post #728 of 879 Old 10-10-2019, 09:57 AM - Thread Starter
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Originally Posted by a77cj7 View Post
I am also intrigued by the plexiglass idea. I just called my local glass shop, and they don’t have 3/4, but they do have 1/2.
@Red Five . I’d have to add mdf supports around the perimeter of the front chamber to screw the plexi to. Would this affect the horn tuning much? Say a 3/4” x 1” strip on all three sides.

Thanks,
Chris


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The tuning is mostly a function of length on the non flared resonator. The cross sectional area of the horn effects sensitivity. You would have to take up a good amount of space before it would be an issue and it would most likely only be an effect on sensitivity.

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 #729 of 879 Old 10-10-2019, 10:14 AM
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The tuning is mostly a function of length on the non flared resonator. The cross sectional area of the horn effects sensitivity. You would have to take up a good amount of space before it would be an issue and it would most likely only be an effect on sensitivity.


Awesome, thanks for answering all my questions.

I’m gonna build for plexi. I’ll have to do much more finish and paint inside the cabinet, but hopefully will be worth it. If I don’t like the effect, I can always glue in a mdf panel later.

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post #730 of 879 Old 10-10-2019, 10:48 AM
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Holy &@*#, Lexan is expensive. I just got a 24” x 28” sheet for $100. I’ll get a second one if it works well. Sure hope its worth it.


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post #731 of 879 Old 10-10-2019, 11:13 AM
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Quote:
Originally Posted by Kothoga View Post
Lol, I had already hit Red up for a 24" version.

It is going to make the 32 cuft of the QW LBM with a UM18 look smallish by comparison lol. I can sim something. How far can a HST 24 be pushed?

Cannot cut and paste easily at the office but here are the specs:

HS24 Dual 2 ohm voice coils
Re 2.9 ohms
Fs 18.6 Hz
Qes 0.42
Qms 5.52
Qts 0.39
Le 2.3 mH
Sd 207781.7 mm^2
Vas 553.7 L
Bl 25.49
Mms 806 g
Cms 90.29
Sensitivity (2.3v/1m) 95.44 db
Xmax 38 mm
RMS Power Handling 2000 watts
8 to 12 ft^3 sealed, 16 to 20 ft^3 ported, or infinite baffle
Cutout: 22.5″
Outer Diameter: 24.5″
Mounting depth: 13.5″
Mounting flange to top of surround: 1.5″
Driver displacement: 0.75 ft^3

Theater: JVC RS540U, 2.35:1 142" screen, Onkyo RZ1100, Panasonic UB820, Outlaw Audio M2200 Monoblock x3, Klipsch RF7II, RC64II, RS62II, 5800CII x4 Atmos, PSA V3611 Subwoofer x2.
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post #732 of 879 Old 10-10-2019, 11:19 AM
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Originally Posted by a77cj7 View Post
Holy &@*#, Lexan is expensive. I just got a 24” x 28” sheet for $100. I’ll get a second one if it works well. Sure hope its worth it.


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Polycarbonate sheet is a LOT stronger for about the same price.... hopefully that acrylic can take the pressure...


Juju

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post #733 of 879 Old 10-10-2019, 11:26 AM - Thread Starter
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Originally Posted by Kothoga View Post
Cannot cut and paste easily at the office but here are the specs:

HS24 Dual 2 ohm voice coils
Re 2.9 ohms
Fs 18.6 Hz
Qes 0.42
Qms 5.52
Qts 0.39
Le 2.3 mH
Sd 207781.7 mm^2
Vas 553.7 L
Bl 25.49
Mms 806 g
Cms 90.29
Sensitivity (2.3v/1m) 95.44 db
Xmax 38 mm
RMS Power Handling 2000 watts
8 to 12 ft^3 sealed, 16 to 20 ft^3 ported, or infinite baffle
Cutout: 22.5″
Outer Diameter: 24.5″
Mounting depth: 13.5″
Mounting flange to top of surround: 1.5″
Driver displacement: 0.75 ft^3

The box will be huge, system volume is 968 liters. Velocity with the port configuration is surprisingly low 28m/s taking on 5.13kws. Yeah 5.13kws to hit 38mm of excursion!


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Size:	48.3 KB
ID:	2626280  

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).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #734 of 879 Old 10-10-2019, 11:30 AM
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Polycarbonate sheet is a LOT stronger for about the same price.... hopefully that acrylic can take the pressure...


Juju


Lexan is polycarbonate. Lucite is acrylic. You did scare me for a second though. I believe acrylic is way cheaper.

Chris


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post #735 of 879 Old 10-10-2019, 11:34 AM
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The box will be huge, system volume is 968 liters. Velocity with the port configuration is surprisingly low 28m/s taking on 5.13kws. Yeah 5.13kws to hit 38mm of excursion!

If you don’t mind doing a sim just for S%#^ and giggles, try this one:


Driver is no longer made, but should be wicked in a horn. It’s gonna take some massive power though.

Chris



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post #736 of 879 Old 10-10-2019, 11:38 AM
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Originally Posted by a77cj7 View Post
Lexan is polycarbonate. Lucite is acrylic. You did scare me for a second though. I believe acrylic is way cheaper.

Chris


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You are correct Sir....they are close to the same price in my area which is crazy to me....


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post #737 of 879 Old 10-10-2019, 12:27 PM - Thread Starter
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Originally Posted by a77cj7 View Post
If you don’t mind doing a sim just for S%#^ and giggles, try this one:


Driver is no longer made, but should be wicked in a horn. It’s gonna take some massive power though.

Chris



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After some tinkering and 11.86kw you can get this!

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ID:	2626288  

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).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #738 of 879 Old 10-10-2019, 12:31 PM
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After some tinkering and 11.86kw you can get this!



Wow, I guess not a driver suited to horn use after all. And just need a sp12k, running one vc per channel, lol. Thanks for satisfying the curiosity.

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post #739 of 879 Old 10-10-2019, 12:35 PM - Thread Starter
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Wow, I guess not a driver suited to horn use after all. And just need a sp12k, running one vc per channel, lol. Thanks for satisfying the curiosity.

Chris


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I could see someone with a lot of space maybe build a large box for the other 24, it looked better than I expected. A couple smaller MBM type Devastators could probably be setup to crossover well into it.



-John

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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 #740 of 879 Old 10-10-2019, 12:42 PM
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Devastator an LTD02 hybrid design

Quote:
Originally Posted by Red Five View Post
I could see someone with a lot of space maybe build a large box for the other 24, it looked better than I expected. A couple smaller MBM type Devastators could probably be setup to crossover well into it.



-John


Agreed, though that’s approaching the SLLT box sizes.
Thats why I was curious about the SHS, i was expecting similar performance in a fraction of the box volume. Albeit at greatly increased power.
Apparently I don’t understand horns as well as I thought.

It seems like kind of a waste to have a HS-24 roll off at 20hz though, their ulf production is crazy. I think I’d stick to the BMD Max and just use multiples.

2 colocated BMD Max’s on the same 5kw should be damn close at 20hz, and gain from there. Driver cost isn’t far off either, 1 @ $1275 vs 2 @ $750.

Chris


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post #741 of 879 Old 10-10-2019, 01:43 PM - Thread Starter
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Agreed, though that’s approaching the SLLT box sizes.
Thats why I was curious about the SHS, i was expecting similar performance in a fraction of the box volume. Albeit at greatly increased power.
Apparently I don’t understand horns as well as I thought.

It seems like kind of a waste to have a HS-24 roll off at 20hz though, their ulf production is crazy. I think I’d stick to the BMD Max and just use multiples.

2 colocated BMD Max’s on the same 5kw should be damn close at 20hz, and gain from there. Driver cost isn’t far off either, 1 @ $1275 vs 2 @ $750.

Chris


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That is just it, the NSW for the price and the wider range is just that good of a deal. That is what I think the next project will be utilizing the NSW low end, but also pushing the response of the horn higher up. The box will probably be about the same volume as a BMD MAX, just deeper and shorter.
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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).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #742 of 879 Old 10-10-2019, 06:19 PM
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What would that 1/2" Plexiglass look like? I'd love to replace that panel with this Plexiglass if it can make my driver visible . Also, are you planning to put that on the front or back? Back, I can easily replace but front is glued so that won't work .


Sorry for the late response. It’s the front panel that is attached to the QW port/horn.
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post #743 of 879 Old 10-10-2019, 06:22 PM
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Originally Posted by a77cj7 View Post
Holy &@*#, Lexan is expensive. I just got a 24” x 28” sheet for $100. I’ll get a second one if it works well. Sure hope its worth it.


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Call around I got 2 panels cut to 1/16” oversized to allow sanding of edges for roughly $209 + tax. My panels will be a final size of 32.25 x 25.5
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post #744 of 879 Old 10-10-2019, 06:23 PM
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What would that 1/2" Plexiglass look like? I'd love to replace that panel with this Plexiglass if it can make my driver visible . Also, are you planning to put that on the front or back? Back, I can easily replace but front is glued so that won't work .
If you really wanted to..... you could use a jig saw to cut out most of the panel, then use a flush bit in your router for the final pass..... not hard just a PITA!!


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Polycarbonate sheet is a LOT stronger for about the same price.... hopefully that acrylic can take the pressure...


Juju


Actually polycarbonate is more expensive by $50 more per panel and will scratch easier. Acrylic is more resistant to scratches and more clear at that thickness and thicker pieces. It’s plenty strong enough for the “pressure”.
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Originally Posted by Purenv View Post
Call around I got 2 panels cut to 1/16” oversized to allow sanding of edges for roughly $209 + tax. My panels will be a final size of 32.25 x 25.5
Would you care to share such information? Where are you getting them from?


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post #747 of 879 Old 10-10-2019, 06:41 PM
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Originally Posted by Purenv View Post
Actually polycarbonate is more expensive by $50 more per panel and will scratch easier. Acrylic is more resistant to scratches and more clear at that thickness and thicker pieces. It’s plenty strong enough for the “pressure”.
Good to know.... Thanks


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Well, got a good start on the mini’s tonight. All table saw and circular saw cuts are done. Miter saw and router from now on.

Chris


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post #749 of 879 Old 10-11-2019, 05:40 AM
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Exclamation

Just received my B&C DS115 from Parts Express and noticed that the unit in the box is not as marked. The box shows it as a 4ohm, unit is an 8ohm.


Theater: JVC RS540U, 2.35:1 142" screen, Onkyo RZ1100, Panasonic UB820, Outlaw Audio M2200 Monoblock x3, Klipsch RF7II, RC64II, RS62II, 5800CII x4 Atmos, PSA V3611 Subwoofer x2.
2 Channel: Parasound P6, Parasound A23+, Rega Planar 6 with Ortofon 2M Bronze, Klispch La Scala II.
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post #750 of 879 Old 10-11-2019, 05:50 AM
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Just received my B&C DS115 from Parts Express and noticed that the unit in the box is not as marked. The box shows it as a 4ohm, unit is an 8ohm.



I would be calling them as soon as possible

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