C/E/X PA Flat to 30 (FT30) PA TH Awesomeness

[chrapladm]

DO you have the length dimensions?

 

[epa]

253 from s2 to s4 if you put it in hr.
i think you want to be close to 300 for 30 hz
but its only question of making tha cab deeper

 

[chrapladm]

I cant input S6. Unless I have the older version of HR and you can now.

BUT I have :
L23 220
L34 85

I can change S5 1740 to S6 instead? But it doesnt make much difference in doing this.

BUT the simulation look about the same as your TH I posted earlier. But your last post has a deeper valley at 100hz and this design also goes a tad lower with the 305 L2-4

 

[epa]

s3 1500
s4 1740
s5 2036
are siming tbw100 8 ohm?

 

[chrapladm]

That is what I ended up with. It is slightly different compared to the S values you gave. It got rid of a bit of the valleys. About 411liters also.

s3 1500
s4 1740
s5 2036
are siming tbw100 8 ohm?

Just saw this. The valleys are better with your new S values. I am also using the 21SW152 in my simulations. Will look at the 8ohm TBW100 now.

The TBW100 looks great. Nothing close to the 21" but still great.

What 21" did you have on hand?

 

[epa]

i wil put it in to akabak but atm im of to do something else

 

[chrapladm]

No problem. Will have to look over the CAD drawing again also. See if I can see whats going on in the drawing.

 

[epa]

if extended dy 10 cm i get this with the b&c 21 152
i have to check the data though.

 

[BP1Fanatic]

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.

 

[chrapladm]

if extended dy 10 cm i get this with the b&c 21 152
i have to check the data though.

Your newest response shape there falls off before 30hz. My latest one and the one above falls off at about 30hz.

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.

S1 could be whatever you wanted. Most start off with the radius of the drivers while others dont use anything depending how much of the cone is exposed. I have seen all different ways of doing it. And changing L12 only effects the response by making the valley near 90hz but deeper.

 

[epa]

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

 

[chrapladm]

Yes 10cm does it for the 21. It extends to just a bit past 30hz now.

 

[epa]

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

 

[epa]

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)

 

[chrapladm]

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.

 

[epa]

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

 

[chrapladm]

I like the square one best so far. Is there anything drawn out yet?

Something I can see and adjust from there?

 

[epa]

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

 

[chrapladm]

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.

 

[BP1Fanatic]

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.