2x15 in 180L, tuning
Printed From: Speakerplans.com
Category: Plans
Forum Name: Ported Enclosures
Forum Description: Post all your reflex and bandpass and 'other' boxes with holes in stuff here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=106743
Printed Date: 26 March 2023 at 1:39pm
Software Version: Web Wiz Forums 12.05 - http://www.webwizforums.com
Topic: 2x15 in 180L, tuning
Posted By: LjudLahger
Subject: 2x15 in 180L, tuning
Date Posted: 01 January 2022 at 9:12pm
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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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Replies:
Posted By: csg
Date Posted: 01 January 2022 at 10:57pm
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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. ------------- “The fact is this is about identifying what we do best and finding more ways of doing less of it better” |
Posted By: Peter Jan
Date Posted: 02 January 2022 at 12:40pm
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. |
csg wrote:Posted By: LjudLahger
Date Posted: 02 January 2022 at 1:20pm
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Perfect! Thank you guys! |
Posted By: LjudLahger
Date 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  Thank you again
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Posted By: LjudLahger
Date Posted: 03 January 2022 at 9:05pm
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Posted By: LjudLahger
Date 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. |
Posted By: LjudLahger
Date Posted: 28 January 2022 at 7:33pm
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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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Posted By: Peter Jan
Date Posted: 28 January 2022 at 8:24pm
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In that frequency range you're using it in ... none at all. |
Posted By: LjudLahger
Date Posted: 28 January 2022 at 8:26pm
Maybe 40-100,120hz?
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Posted By: csg
Date Posted: 28 January 2022 at 9:35pm
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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” |
Posted By: LjudLahger
Date Posted: 28 January 2022 at 9:38pm
I love this forum! Thank you guys
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Posted By: JonB67
Date Posted: 29 January 2022 at 8:04am
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Double 15 reflex, the under rated sub! What are your impressions of it?
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Posted By: LjudLahger
Date Posted: 29 January 2022 at 8:27am
I really like it, was strong down low 40ish and with higher lowpass at 130ish it had good attack and punch. We did most listening with 38 and 100hz filter. In the living room it was hard to tell if the db/w was any high but a lot of sawdust from the sealing / attic was snowing down  I have only a few reflex reference in the past, 2xkappa 15lf 160L, pd.186mk2 in b&c sub18, 18sound kit18sub and a own 200L 35hz sub. I don't have these anymore. This one sounded more controlled and powerful then any of the others. The pd was extremely slow and muddy. The cab it self need a little more bracing. This will be a great allround cab
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Posted By: LjudLahger
Date Posted: 09 May 2022 at 11:51am
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Now they are soon finished. Here are some pics of the process            |
Posted By: LjudLahger
Date Posted: 09 May 2022 at 8:26pm
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I made this restoration with only a few tools and a small room (closet) and what I got left to do is to get the handles nice, get the rust off because they don’t make them anymore. So from a couple of sides with mould, too small vents, minimal bracing, xlr inputs, old beer on cones, not air sealed, oxedized corners and alu profiles to this oldschool beauty
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Posted By: JonB67
Date Posted: 09 May 2022 at 11:20pm
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Great job! I love a double 15. If you don't need the last few hz from an 18, it has so much to offer but gets overlooked far too easily.
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Posted By: LjudLahger
Date Posted: 10 May 2022 at 3:47pm
Thanks! I agree, but the prices are equal to 18” now so I understand that you will pic them instead…
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