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2x15 in 180L, tuning
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LjudLahger View Drop Down
Young Croc
Young Croc


Joined: 31 July 2008
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    Posted: 01 January 2022 at 9:12pm
I am restoring a pair of cabs that are 183L inside without ports.
The original was tuned to 32hz which i find to low.
They were 2x4” and now its going to be 2x6”

The question is; what are the main fb for 15”?

I was thinking of 40hz but is this to low too?
If I sim 50hz fb the graf are much flatter but dont go as low.
Could I use a slowly falling curv or should I aim for a flat one?
Highpass gain will also help at the end, right?

The drivers are old RCF L15P200AK with green backplate and a fs of 38hz.

They are going to play mainstream music at the end.

And yes, 180L is a bit small but this i what i got and try to do the best of :-)
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csg View Drop Down
Old Croc
Old Croc


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Points: 6086 		Post Options Post Options   Thanks (1) Thanks(1)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 01 January 2022 at 10:57pm
Going with a net int. volume of 170Hz ( drivers, ports, bracing etc), FB 45.6 gives me a F3 with 46.6Hz with no displacement issues and a nice flat alignment. 2 150mm round ports 199mm long give reasonable air velocity.

I think you would need a larger box to use the x-max and get lower. Still, a strong 45Hz is still plenty low for most music, and restricting displacement is no bad thing for elderly drivers.
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Peter Jan View Drop Down
Young Croc
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Joined: 16 December 2008
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Points: 1012 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2022 at 12:40pm
Originally posted by csg csg wrote:

Still, a strong 45Hz is still plenty low for most music.


Fully agree with that. For an allround bass cab, tuning in the lower to mid 40 Hz and an F3 in about the same region, is just where you need it to be.
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2022 at 1:20pm
Perfect! 
Thank you guys!
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2022 at 8:57pm
I went with fb of 42hz, it gave me a good length to rest on a brace inside Embarrassed

Thank you again Thumbs Up
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 03 January 2022 at 9:05pm
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2022 at 5:56am
Yesterday I put one cab together, no sealing on any driver , hardware or ports. And no wadding . Went to my old mans house for some testing, just to know what the drivers with new ports could do. I was fun :-) worked very well and now I got some ideas of how it going to sound when its done.
Top was a pd.121+b&c me45+p.audio bm-d450mk1.
Dcx and qsc usa 850+1300.
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2022 at 7:33pm
I need advice on dampening materials for this reflex cab.
What would you use and how much?
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Peter Jan View Drop Down
Young Croc
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Points: 1012 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2022 at 8:24pm
In that frequency range you're using it in ... none at all.
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LjudLahger View Drop Down
Young Croc
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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2022 at 8:26pm
Originally posted by Peter Jan Peter Jan wrote:

In that frequency range you're using it in ... none at all.

Maybe 40-100,120hz? 
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csg View Drop Down
Old Croc
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As above, wadding will have no benefit at those frequencies. 

Good bracing is the important thing in a reflex sub.
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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LjudLahger View Drop Down
Young Croc
Young Croc


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Points: 838 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2022 at 9:38pm
Originally posted by csg csg wrote:

As above, wadding will have no benefit at those frequencies. 

Good bracing is the important thing in a reflex sub.

I love this forum!
Thank you guysBig smile
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