heart Simple Mid-Top SMT 212

10 years 2 months ago #5933 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
sim soon to come.

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10 years 2 months ago #5934 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
smt212 (only mid section)
s1=2172
s2=4120
con=29.2
vrc=23.8 (with driver)
lrc=17.3
vtc=44107 (with driver)
atc=1048

there are 2 air port but I don't know to obtain combined response with directivity, however
ap=72
lpt=1.6
path lenght difference= 33

Probably I'd go for 2 single version without port with an altec 811b horn on top in a separate cab.

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10 years 2 months ago #5976 by nickyburnell
Replied by nickyburnell on topic Simple Mid-Top SMT 212
Ta.

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9 years 8 months ago #6928 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
Built and tested 4 single smt212. Just B&c 12" driver in one cab. So portable so loud. I've modified the port shape mantaining the same area, 2 quarter circle instead of 2 triangles. Just estetic reason ;)

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9 years 8 months ago #6929 by nickyburnell
Replied by nickyburnell on topic Simple Mid-Top SMT 212
Pics?

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9 years 8 months ago #6932 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
Sorry, I don't pics of only the smt, only the whole rig..however I've posted it on show off thread. Don't want to hijack the thread.

cheers.

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9 years 6 months ago #7761 by MAutopsy
Replied by MAutopsy on topic Simple Mid-Top SMT 212
FAILURE- They dont offer 15mm ply where i am, so i tried using 1/2", but its not gonna work. I have to use 3/4" (18mm). anyone else have this problem?

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8 years 8 months ago #10667 by MAutopsy
Replied by MAutopsy on topic Simple Mid-Top SMT 212
tony, would placing the HF section in the middle fix the phase problem you speak of?
Attachments:

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8 years 8 months ago #10669 by tony.a.s.s.
Replied by tony.a.s.s. on topic Simple Mid-Top SMT 212
Long time no action on this one. I had to go back and see what we'd all been talking about. Because I know that two speakers, especially mids, react with each other when they are close, it's logical to assume that if you pull them apart, it will have an effect. I often build test boxes to try all sorts of things, so it it easy to establish certain things. You would have to have some sort of measuring equipment, or perhaps something as simple as a Spectrum analyzer.
All you need to do is put the pink noise signal into both cabs watch the screen and start to move then apart. To make reading easier, if you have an equalizer, it is better to make the speakers as flat as possible, and watch the change in response as you move the boxes. You could simulate the position that the speakers would be in the cab. This would be the best way to find out.

Peace and goodwill to all speaker builders

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8 years 8 months ago #10670 by MAutopsy
Replied by MAutopsy on topic Simple Mid-Top SMT 212
i dont have any such tools, but thought it might make a difference. when i build a full smt212 i will give it a try, cant hurt can it?

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