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2x15 in 180L, tuning |
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LjudLahger ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
![]() ![]() ![]() ![]() ![]() 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 ![]() Old Croc ![]() Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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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.
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“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 ![]() Young Croc ![]() ![]() Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1012 |
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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 ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Perfect!
Thank you guys! |
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LjudLahger ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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I went with fb of 42hz, it gave me a good length to rest on a brace inside
![]() Thank you again
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LjudLahger ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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LjudLahger ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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![]() 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 ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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I need advice on dampening materials for this reflex cab.
What would you use and how much?
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Peter Jan ![]() Young Croc ![]() ![]() Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1012 |
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In that frequency range you're using it in ... none at all.
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LjudLahger ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Maybe 40-100,120hz?
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csg ![]() Old Croc ![]() Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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As above, wadding will have no benefit at those frequencies.
Good bracing is the important thing in a reflex sub.
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“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 ![]() Young Croc ![]() Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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I love this forum! Thank you guys
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