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C/E/X PA Flat to 30 (FT30) PA TH Awesomeness
C/E/X PA Flat to 30 (FT30) PA TH Awesomeness
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Old 3rd October 2015, 07:36 PM   #811
epa is offline epa  Netherlands
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Quote:
Originally Posted by chrapladm View Post
Your newest response shape there falls off before 30hz. My latest one and the one above falls off at about 30hz.
so extend it a bit more lets say 15cm
ill put it in akabak tomorrow
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Old 4th October 2015, 01:47 AM   #812
chrapladm is offline chrapladm  Australia
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Yes 10cm does it for the 21. It extends to just a bit past 30hz now.
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Old 4th October 2015, 07:23 AM   #813
epa is offline epa  Netherlands
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i updated the pic in post 808
added a 48db lr @20 hz giving you -10 of 23 hz
box is 100 deep now
the only thing im not sure of is the lenght of the sections
could be that the wave turning the corner ad some length.

if you plan to bild it ,i suggest making from mdf first
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Old 4th October 2015, 07:39 AM   #814
epa is offline epa  Netherlands
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Originally Posted by BP1Fanatic View Post
I'm curious, how is L12 less than half the diameter of the speaker? 10.16cm = 4in. You 2 are using 9.1cm. I would think L12 would be between 25.4 and 30.48cm for a 21" speaker.
s2 is always measured bij the center of the driver wich is @ 0 in this case.
s1=s2 in symetric design(s1 cannot be negative value)
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Old 4th October 2015, 08:24 AM   #815
chrapladm is offline chrapladm  Australia
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Quote:
Originally Posted by epa View Post
i updated the pic in post 808
added a 48db lr @20 hz giving you -10 of 23 hz
box is 100 deep now
the only thing im not sure of is the length of the sections
could be that the wave turning the corner ad some length.

if you plan to build it ,i suggest making from mdf first
Well I can do MDF to start. 16mm is easy to come by.

If the cabinet is 100 deep how tall is this thing?

I like the cube look but dont want to go too deep. Maybe 100 x 100 x 90. Just dont want to have 1m deep if I can help it.
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Old 4th October 2015, 08:55 AM   #816
epa is offline epa  Netherlands
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or chipwood or underlayment.
the cab is 100 wide 63 tall.
so that would make 630 liters,and that doesn.t ad up liters/spl.
thats why i think you gain length in the corners
i sggest you make it 90 deep and see what happens
my gues is it plays as low (or even lower)as the sim

the square one is 80x80 ,and is easyer to bild
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Last edited by epa; 4th October 2015 at 09:01 AM.
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Old 4th October 2015, 09:08 AM   #817
chrapladm is offline chrapladm  Australia
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I like the square one best so far. Is there anything drawn out yet?

Something I can see and adjust from there?
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Old 4th October 2015, 09:16 AM   #818
epa is offline epa  Netherlands
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no
but i could create one no problem
sofar whe got
b&c 21sw 152 .8r
s2 is set at 830?
box is 80x80x90?

edit/i simmed the 8ohm version
the 4 ohm version go's a few hz lower
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Last edited by epa; 4th October 2015 at 09:32 AM.
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Old 4th October 2015, 10:16 AM   #819
chrapladm is offline chrapladm  Australia
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Quote:
Originally Posted by epa View Post
no
but i could create one no problem
sofar whe got
b&c 21sw 152 .8r
s2 is set at 830?
box is 80x80x90?

edit/i simmed the 8ohm version
the 4 ohm version go's a few hz lower
I have the four ohm version. And huge thanks also. 80x80x90 will have to do. S2 is 830 yes.
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Old 4th October 2015, 01:30 PM   #820
BP1Fanatic is offline BP1Fanatic  United States
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Quote:
Originally Posted by epa View Post
s2 is always measured bij the center of the driver wich is @ 0 in this case.
s1=s2 in symetric design(s1 cannot be negative value)
I was not questioning your area values. I was questioning where you placed your 1st tap.
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