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post #91 of 121 Old 01-01-2019, 12:10 PM
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Quote:
Originally Posted by Red Five View Post
Since it is just plugging a port you could try it both ways without too much hassle in your listening room. With a lower tune you have more low frequency extension, but the trade off is losing output above the tuning. How important the extension is can vary from person to person, room to room. Your mileage may vary.
What material would work for plugging the port?

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post #92 of 121 Old 01-01-2019, 03:33 PM
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Wood can work with a seal on the back of it. You can always use foam and squeeze it in the port and then let it expand into the opening for a seal. I think Beast has a port cover on his Skhorn that would look nice. Something like that can be used.
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post #93 of 121 Old 01-02-2019, 07:39 PM
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Quote:
Originally Posted by Dan668 View Post
Sweet. Thats good to hear. I will start to build one sometime this week!
DUDE!!! Where are the build pix all ready ..... Jeez....


Just pulling your leg sir........


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post #94 of 121 Old 01-02-2019, 07:57 PM - Thread Starter
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Just a couple pictures of sawdust, the 21 and a progress update/goals @Dan668

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post #95 of 121 Old 01-02-2019, 11:04 PM
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Quote:
Originally Posted by VegaMan View Post
pa460 gives interesting results in a 3/4 sized variant with a 20hz-ish tune

Do you plan on sharing your findings?


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post #96 of 121 Old 01-03-2019, 04:19 AM
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Quote:
Originally Posted by jujuman200 View Post
Do you plan on sharing your findings?


Juju
Not in an effort to derail this thread, but here you go.
First model is 19" internal width version of this enclosure pa460 loaded vs same size enclosure w/o the resonator. 2pi (groundplane outdoors) @ 20volts which takes xmax to 6mm. As discussed in VBSS thread, pa460 may have more in the tank. If it sounds like a moose is jumping around in your resonant enclosure (horn, etc) turn it down.

Second model, 19" internal width version of this design vs VBSS. this enclosure @ 20volts, VBSS @ 25volts which makes excursion the same, 2pi sim. This enclosure gives a little more (2-3db) output in the "hip-hop" region in exchange for a little roughness higher up. since DSP is so popular here, these shouldn't be hard to handle with a few cuts making a smooth transition, and could possibly be handled with a light lining of the resonant chamber. One would have to decide if the extra enclosure size is worth the benefits/drawbacks/etc.
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post #97 of 121 Old 01-03-2019, 06:46 AM
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OK... I'm in!

I've got a 21DS115 on the way, and I just ordered a new router and jigsaw that I need to break in. After all the jigsaw work I did on my cubes, I didn't realize how much of a POS my 20+ year-old Crapsman jigsaw was until I tried a modern orbital jigsaw.

I'll be checking into material, today (I'm thinking of using birch ply for this one, to save some weight, else it will be 1" MDF, again).

I got so much enjoyment out of building and listening to my MartyCubes, I'm anxious to do it again!
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post #98 of 121 Old 01-03-2019, 07:00 AM
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It is amazing how much better a Jigsaw is with an appropriately powered motor. I used to borrow my neighbors 5 amp jigsaw since I almost never needed one, then I saw a Makita 9am for $75 one day and jumped on it (just so I didn't have to keep borrowing someone elses tools). Wow, big difference! I still want a jigsaw with a stronger motor but not many puts more chooch into their jigsaws.
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post #99 of 121 Old 01-03-2019, 07:20 AM
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Quote:
Originally Posted by VegaMan View Post
Not in an effort to derail this thread, but here you go. {snip}

One would have to decide if the extra enclosure size is worth the benefits/drawbacks/etc.
@VegaMan
Well thank you sir..... things to consider indeed...


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post #100 of 121 Old 01-03-2019, 07:24 AM
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Quote:
Originally Posted by Trimlock View Post
It is amazing how much better a Jigsaw is with an appropriately powered motor. I used to borrow my neighbors 5 amp jigsaw since I almost never needed one, then I saw a Makita 9am for $75 one day and jumped on it (just so I didn't have to keep borrowing someone elses tools). Wow, big difference! I still want a jigsaw with a stronger motor but not many puts more chooch into their jigsaws.
Yeah... just the orbital action made a huge difference in how fast I was able to rip through 1" MDF. It took an inordinate amount of time with my old saw, with a fresh 10pitch blade.

I opted for this saw: http://www.amazon.com/Bosch-7-2-Amp...words=JS572EBK
I "test-drove" a Dewalt DW331, and that convinced me to junk my old one and upgrade. Checking reviews though, there's an issue with the Dewalt not securely holding the blade at times. I had this happen to me the first time I used it. The Bosch simply beats 'em all.

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post #101 of 121 Old 01-03-2019, 08:56 AM
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Quote:
Originally Posted by BrianC69 View Post
Yeah... just the orbital action made a huge difference in how fast I was able to rip through 1" MDF. It took an inordinate amount of time with my old saw, with a fresh 10pitch blade.

I opted for this saw: http://www.amazon.com/Bosch-7-2-Amp...words=JS572EBK
I "test-drove" a Dewalt DW331, and that convinced me to junk my old one and upgrade. Checking reviews though, there's an issue with the Dewalt not securely holding the blade at times. I had this happen to me the first time I used it. The Bosch simply beats 'em all.


Yea most the friction fitted t-shanks are like that. The ones with locking mechanisms are better. Mine is friction fit and it holds ok.


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post #102 of 121 Old 01-04-2019, 07:59 AM
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Any point to having feet on a subwoofer enclosure of this size? Such as rubber isolation ones. My floor is carpeted.
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post #103 of 121 Old 01-04-2019, 08:09 AM - Thread Starter
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Quote:
Originally Posted by Dan668 View Post
Any point to having feet on a subwoofer enclosure of this size? Such as rubber isolation ones. My floor is carpeted.

The feet are not necessary, a cab this big is not moving on carpet.
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post #104 of 121 Old 01-06-2019, 09:35 AM
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Quote:
Originally Posted by Dan668 View Post
Any point to having feet on a subwoofer enclosure of this size? Such as rubber isolation ones. My floor is carpeted.
Is it running, measurements. Work isnt slowing down so I won't have time to build until March, maybe.

Waiting to order ports after i see how these turn out.

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post #105 of 121 Old 01-08-2019, 10:29 AM
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Quote:
Originally Posted by LTD02 View Post
might be worth noting that this cab doesn't really work with the 460HO and UM18 drivers. they just give a huge narrow peak around 70hz. not a smooth response at all. will have to find something else for those drivers. :-)

So..... What you working on for the RS460? Do tell......


And thank you for all your great contributions to this group.



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post #106 of 121 Old 01-11-2019, 10:59 AM - Thread Starter
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Any build updates, or building goals for the weekend?

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post #107 of 121 Old 01-11-2019, 10:16 PM
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The sub has been done and painted for a week now. Unfortunately, ive been too busy, havent had the chance to test it. Out on a snowmobiling trip. I will post some pictures mid next week of the entire build when i get back. And then post results of the enclosure mic'd on the weekend.
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post #108 of 121 Old 01-12-2019, 12:48 AM
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Quote:
Originally Posted by Dan668 View Post
The sub has been done and painted for a week now. Unfortunately, ive been too busy, havent had the chance to test it. Out on a snowmobiling trip. I will post some pictures mid next week of the entire build when i get back. And then post results of the enclosure mic'd on the weekend.
@Dan668
Thanks for the update..... looking forward to your posts.


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post #109 of 121 Old 01-12-2019, 12:05 PM
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Originally Posted by jujuman200 View Post
So..... What you working on for the RS460? Do tell......

And thank you for all your great contributions to this group.

Juju
nothing in the works at the moment. a full range horn for the 460HO would likely be very big/huge.

and... :-)

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post #110 of 121 Old 01-12-2019, 12:18 PM
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just for kicks, if the F20 horn is the starting point and its internal diameter of 18.5" is increased to 24" and the 460HO is used, this is roughly how that may look:



increasing internal width to 30" actually starts to look pretty good.



increasing internal width to 36" looks even better.




* ignore the actual levels, some of those were at 2v and some were at an actual 1 watt. shape of curves is the focus here.
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post #111 of 121 Old 01-12-2019, 12:35 PM
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Quote:
Originally Posted by Red Five View Post
Any build updates, or building goals for the weekend?
I just received my 21DS115 yesterday, and if my next job goes as planned, will have quite a bit of free time to build the cab in the next week or two. Still have to pick up material, but also got a new router and jigsaw and I'm chomping at the bit to use them!
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post #112 of 121 Old 01-12-2019, 04:50 PM
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Quote:
Originally Posted by LTD02 View Post
just for kicks, if the F20 horn is the starting point and its internal diameter of 18.5" is increased to 24" and the PA460 is used, this is roughly how that may look:


[snip].
@LTD02

Interesting....


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post #113 of 121 Old 01-12-2019, 04:54 PM
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@LTD02

Interesting....

Juju
i'm sorry...that should have read the 460HO models that way. those are sims with the 460HO driver.

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post #114 of 121 Old 01-12-2019, 05:03 PM
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@LTD02


I have a dilemma.... 2 more VBSS/PA460 or 1 Devastator with 18TWB100? They are about the same size total, cost is not really an issue between the 2 but the B&C will be about a third more..... they would be in the same place in the room....front center or rear right of the room......


I would like to put the VBSS/Devastator under the screen and put both Full Marty w/460HO in the rear of the room. The 2 VBSS I have as the woofer section of my mains do a great job..... just looking for more donkey kick....tough choice...


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post #115 of 121 Old 01-12-2019, 05:04 PM
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Quote:
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...36" wide....
Thats huge. Is does look better in sim land but you could just spend a little bit more money and have a smaller horn. To each their own of coarse.
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post #116 of 121 Old 01-12-2019, 05:15 PM - Thread Starter
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John, how much of an advantage does the 18TBW have vs the PA460?

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post #117 of 121 Old 01-12-2019, 05:50 PM
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@LTD02


I have a dilemma.... 2 more VBSS/PA460 or 1 Devastator with 18TWB100? They are about the same size total, cost is not really an issue between the 2 but the B&C will be about a third more..... they would be in the same place in the room....front center or rear right of the room......


I would like to put the VBSS/Devastator under the screen and put both Full Marty w/460HO in the rear of the room. The 2 VBSS I have as the woofer section of my mains do a great job..... just looking for more donkey kick....tough choice...


Juju
the tbw100 in the devastator cab is quite a bit more peaky. dual pa460 is probably the better bet.
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post #118 of 121 Old 01-12-2019, 05:52 PM
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John, how much of an advantage does the 18TBW have vs the PA460?
advantage how?

the pa460 may have a hair better upper end efficiency, but the tbw will have about 2x on the low end. the 18tbw is a good driver. it just doesn't tend to hit the peak of the value equation.

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post #119 of 121 Old 01-12-2019, 06:12 PM
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Quote:
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the tbw100 in the devastator cab is quite a bit more peaky. dual pa460 is probably the better bet.
Thank you Sir...


Juju
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post #120 of 121 Old 01-12-2019, 06:41 PM - Thread Starter
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advantage how?

the pa460 may have a hair better upper end efficiency, but the tbw will have about 2x on the low end. the 18tbw is a good driver. it just doesn't tend to hit the peak of the value equation.

If it gets peaky and how much more it would have on the lower end and upper.

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