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doller View Drop Down
Young Croc
Young Croc


Joined: 19 July 2014
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    Posted: 06 May 2017 at 8:49am
a

Edited by doller - 19 June 2017 at 12:05pm
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MattStolton View Drop Down
Old Croc
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Joined: 04 September 2010
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Points: 4234 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 6:49pm
Proper nutty! Like it!

One fook of a drum fill? Would say it should "kick" nicely, but how low it actually goes is anybodies guess. Would need to see a measurement before condemning.

If you happy with the noise it makes, good luck to you! (Some window draught gasket strip on your curve grill supports, will stop the grill vibrating on them, and bugging you with noise)

Wood skills look better than mine, either way. Much wool behind the PD121?
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains"
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bob4 View Drop Down
Old Croc
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 8:26pm
This kind of cab is also popular with the reggae boyz
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doller View Drop Down
Young Croc
Young Croc


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Points: 509 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 12:04am
a

Edited by doller - 19 June 2017 at 12:06pm
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charlynch View Drop Down
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Points: 189 		Post Options Post Options   Thanks (0) Thanks(0)   Quote charlynch Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 1:35am
Are they LAB 12? if so thy are not very sensitive, the "larger vented subwoofer" Eminence suggest on the "LAB12 more info" pdf will get you to 30 but doubt 8 would keep up.
Art Welters Dual Lab 12 is louder but not as low.
Or horns.
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doller View Drop Down
Young Croc
Young Croc


Joined: 19 July 2014
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Points: 509 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 4:26am
a

Edited by doller - 19 June 2017 at 12:06pm
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bob4 View Drop Down
Old Croc
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 7:15am
Originally posted by doller doller wrote:

Bob, Is there a similer design around?


I'm not aware of any, but there are plenty system and build pics on here.... I think dub specialist did some recently?
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bob4 View Drop Down
Old Croc
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 8:28am
Originally posted by doller doller wrote:

I was looking at the Art Welters. I want something to take to 100sqmtr clubs. Also smaller. lugging labs isn't much fun.


For that size of venues i would have thought a few double reflex with lab12 should be enough? I remember reading about Art's double lab12 bins. Afaik he modded them to ppsl at some point, but i dont remember the conclusion.

Considering your "typing speed" with these tops, you should have a prototype in no time?
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bob4 View Drop Down
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 8:42am
Originally posted by doller doller wrote:

so I started playing around randomly with slices of mdf. Ended up here. Suddenly I am getting about the same output as a cubo. Why? See the 'this changed everything bit'. Rattling windows ect. Please feel free to be as rude as you like this wasn't so much a design just a botch but it works ??? bit rummbly but works. Please help me improve. Confused!


Looks technically like a backloaded horn -> 15"microscoop?

Birth of a new compact bass cab, the 15doller


Edit: have you tried a lab12 in it yet?

Edited by bob4 - 07 May 2017 at 8:46am
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doller View Drop Down
Young Croc
Young Croc


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Points: 509 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 12:07pm
a

Edited by doller - 19 June 2017 at 12:06pm
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bob4 View Drop Down
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 12:59pm
Originally posted by doller doller wrote:

Wow! bob Back load horn that is the term used here in Japan for a yes ! you got it Scoop bin.


Ah well, not every blh is a scoop, not every "scoop" is a blh (warning:severy heresy and sarcasm ). Afaik the term scoop originates from jbl 4530 and 4520, which were first to have that rounded "slide" section just before the mouth. The nickname has stuck to all copies and clones since.

Originally posted by doller doller wrote:

I think that the lack of a back board negates the scoop theory. Maybe I am wrong. But I do see the point.


I'd say that doesnt matter. A blh/scoop is not restricted to the "standard" chamber and throat arrangement (back board &throat at the bottom). In your case, the throat would in theory be between the tip of the "this changes everything" board and the top panel. The volume between that and the driver is the back chamber. There is a long enough "horn path" that seems to expand in the beginning, and is constricted towards the end.

Originally posted by doller doller wrote:

Tried the lab but fell through the cutout and had a real problem with sealing it. Gaffer tape didn't help. gave up.
Might try a Art proto. Start typing this week!
   
Make a test baffle with 12" cutout for testing. Drill a set of holes according to the 15" mounting pattern -> use the tnuts to attach
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bob4 View Drop Down
Old Croc
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Points: 1843 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2017 at 2:12pm
here is my very amateurish trial at a hornresp simulation:



single response:



pack of four:




please note that I'm a bloody noob with hornresp, and I haven't spent a lot of time refining my modelling techniques. More experienced users might come up with very different figures for a simulation. Because of the c-shape and the numerous folds, it's hard to segment the "horn" (at least for me with my limited knowledge).
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