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15" mid woofer adivise...from b&c
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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Points: 663 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Topic: 15" mid woofer adivise...from b&c
    Posted: 27 September 2016 at 5:12pm
Im looking for a decent mid 15" range 250hz to 1200/1500hz.
ive seen that many are good from b&c catalogue like:
http://www.bcspeakers.com/products/lf-driver/15-0/8/15ndl76
or
http://www.bcspeakers.com/products/lf-driver/15-0/4/15nw76-4
or
http://www.bcspeakers.com/products/lf-driver/15-0/8/15ndl88

but when im google around for seen some application i just found reflex loading...

Can any one point me in the right direction for a simple and classic horn enclosuere like this one with no reflex

many thanks
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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: 27 September 2016 at 6:40pm
go 12", especially since you plan to cross above 1 kHz.....

check DJK's double mantaray
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_djk_ View Drop Down
Old Croc
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 28 September 2016 at 12:11am
[/URL]

The old Altec/JBL theater style 15" horns were designed for a 500hz crossover point, and work poorly above there, even with the best available horn type drivers.

A dual 12 designed around a proper horn type driver (B&C 12PE32 or similar) sounds much better, and is easier to build.


Edited by _djk_ - 28 September 2016 at 12:15am
djk
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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Points: 663 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Posted: 28 September 2016 at 9:26am
thanks to all comments, my first project is about a 12" for a mid.... and sound clean and precise.
This time id like (and I need) to build something different more powerfull on mid bass since there will no specific kick section, but a reflex sub cutted at 200/250hz...


and 
check DJK's double mantaray
is it the one in the pic above?


Edited by _Natty_ - 28 September 2016 at 9:28am
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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: 28 September 2016 at 9:14pm
Originally posted by _Natty_ _Natty_ wrote:


is it the one in the pic above?


yes

http://www.audioasylum.com/cgi/vt.mpl?f=hug&m=171409
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bass*en*mass View Drop Down
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Points: 4009 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bass*en*mass Quote  Post ReplyReply Direct Link To This Post Posted: 29 September 2016 at 8:41pm
15" + 8" +1/1.4" makes sense imo, driving the 15" up to 1khz and above doesnt imo
12" horn doesnt go low enough normaly to get low+high enough to meet a comp decently+fill the gap to the subs. you would need a dedicated kickfill imo unless you use higher tuned/low cone mass 18" reflex that do sound ok`ish above 120hz, sacrifice would be lowend though..
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2016 at 1:03am
"12" horn doesnt go low enough"

Really?

Make it bigger.

In the 30's, RCA made a 2" throat aluminum driver (WE594) on a large horn go flat to 40hz.
djk
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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Points: 663 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2016 at 11:15am
I can cut the 2" even lower...the 12khz was assumed to not force too much the drivers. One of the problem that im trying to solve is even the dimension of the mids box, 15" is more close to be at the right size that i need than a 12" thats will need a lot of empty spaces on sides to fit how I need...
I know talking about boxes size when we discuss about sound quality is silly...but i need a specific result
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