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12"+8"+1" Mid/High Plan

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bmf2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmf2 Quote  Post ReplyReply Direct Link To This Post Topic: 12"+8"+1" Mid/High Plan
    Posted: 16 January 2008 at 3:29am
Been working some more on a previous mid/high idea and thought I'd get some opinions.
 
B&C 12PE32                 12"
Eminence Alph 8MRA     8"
Selenium D210TI           1" (crossed at 3.5K)
90 X 40 Rotatable Comp Horn
 
Plan on making a removable filler panel for the 8" to reduce the coverage angle when arrayed. Just plug in the panels and rotate the horn. Dispersion of the lower freq is somewhat of a compromise but shouldn't be as noticable in that range.
 
Heres the box
 
You say it's too loud-I say your hearing is too good
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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:34am
one question.... why not use the 8pe21?????
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mylesound View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mylesound Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:35am
lol i was thinking about something like that.
but to make it simple i was going to use the 8" section from the Xtro
and do a simple reflex 15" with a 1" on top
wasnt sure if that was a good idea so it kinda died in my mind.
i think you have something going. almost like a compact solution to the Xtro.
how low do you think it will go?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djstefanos Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:40am
how about making a skeleton. sort of like the JBL HLA touring series. Looking at that its a heck of a heavy cabinet and waste of space.
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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:45am
nice idea though yeah, whats the crossover point between 12 and 8?
youve got to 3.5k with an 8mr????
fair play!!!
nice idea!
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bmf2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmf2 Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:47am

The main reason for the alpha over the b&c is price. I can buy these alphas for $30! The 8pe21 will cost me right at $100. The second reason is the closed back simplifies construction.

I'm not sure how low it will play. The lower section is the same as a mt122. I need to get to 150hz so I'm not real confident of this part. I thought Super's 1 X 12" might fit this better. Maybe he could PM me the specs?Wink
You say it's too loud-I say your hearing is too good
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bmf2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmf2 Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:54am
djstefanos,
 
The mid/high cabinets we are using now  have two horns, an 8", and a 15" so I don't think the guys will make any complants about the weight.
 
 
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mylesound View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mylesound Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 3:57am
if weight is not a problem why not just go for the xtro?
lol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 4:24am
good point!!!
the mt122 12" should be fine down to 120hz
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bmf2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmf2 Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 4:25am

Mark,

According to B&C the 12 will play all the way up to 2K smoothly. I have no intention of running it anywhere near that high. I will probably use some trial and error with an rta to find the best crossover point. The 8" starts to fall off right about where I want to cross it. It does have a dip at about 2K.

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bmf2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmf2 Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 4:26am
If the mt122 design is good down to 120hz I'll stick with this design as it will be simple to build.
You say it's too loud-I say your hearing is too good
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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2008 at 4:29am
mt121 isnt that easy but hey, how low can you get the 8" down to and still play up to 3khz???
might like to see the 8" plans lol.....
me so horny me love you long throw
horn loaded for her pleasure
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