NCA VSB 218
Printed From: Speakerplans.com
Category: Plans
Forum Name: Other plans
Forum Description: Discussion / Questions about all the other plans
URL: https://forum.speakerplans.com/forum_posts.asp?TID=29866
Printed Date: 26 March 2026 at 6:55pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: NCA VSB 218
Posted By: ex-nihilo
Subject: NCA VSB 218
Date Posted: 19 August 2009 at 6:39pm
|
Could anyone please tell me why the drivers sit on a 'V' inside these cabs and how this changes sound/performance from a G SUB for example? Cheers...
------------- EVERYTHING LOUDER THAN EVERYTHING ELSE |
Replies:
Posted By: highlyunlikely
Date Posted: 19 August 2009 at 11:26pm
| it helps save on bracing so much,raey also said some other mumbo jumbo... |
Posted By: jonminns
Date Posted: 20 August 2009 at 12:16am
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It reduces baffle size and strengthens the cabinet, as far as i'm aware this method doesn't offer any acoustic advantages |
Posted By: djeddie
Date Posted: 20 August 2009 at 6:53pm
I've always thought that, but there are many on here who would fire up Horn Response...
------------- Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB |
Posted By: ex-nihilo
Date Posted: 22 August 2009 at 11:37pm
|
Cheers guys! Could you (or any other SPers) tell me how you'd work out making the
change from a G SUB as on the plans to a G SUB with this 'V' structure,
should we go with this option? Would we basically just be aiming to have the same volume BEHIND the baffle? Cheers...
------------- EVERYTHING LOUDER THAN EVERYTHING ELSE |
Posted By: colinmono
Date Posted: 23 August 2009 at 8:33am
Basically, yes. As far as I know the internal shape doesn't make a big difference to the tuning, it is the port length, port cross sectional area and internal volume that are the main factors. I think the position of the port relative to the drivers does make some difference, as does the shape of the port (particularly the end of it). You are into fairly advanced modelling if you want to predict exactly how these factors will affect your finished cab. Most builders would probably advise building a prototype (MDF is good for this) first to check it sounds / performs the way you want it to. I'm not an expert builder (have only designed one cabinet, with the help of WinISD), there's lots of folk on here with much more experience than me so hopefully someone else will chip in. |
ex-nihilo wrote:Posted By: norty303
Date Posted: 23 August 2009 at 10:13am
It all depends what angle is used between the drivers, as at some point it will start to function as a chamber with a flared port like a manifold design ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: Phil B
Date Posted: 23 August 2009 at 11:42am
|
Also it`s two seperate chambers . The "V" baffle joins to a central baffle to make a "y" shape. The rest you can work out !
.p. ------------- Mostly harmless.... except if catering is shut. Solar Sound System Shennanigans.. http://diyhifi.biz/" rel="nofollow - http://diyhifi.biz/ |
Posted By: norty303
Date Posted: 23 August 2009 at 12:40pm
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Ah, so each driver is in it's own chamber, makes better sense, particularly in the event of driver failure ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: ex-nihilo
Date Posted: 23 August 2009 at 2:13pm
|
THANK YOU! So, the tail of the 'Y' actually seperates the cab into two chambers, didn't realise that, what advantages does this give in the event of a driver failing? And if we were to work on this, do we split the internal volume of the G SUB in half and go from there, or is there (as I'm guessing) quite a bit more to it than that? Cheers again for the advice and excusing the ignorance...
------------- EVERYTHING LOUDER THAN EVERYTHING ELSE |
Posted By: watchman
Date Posted: 24 August 2009 at 8:31pm
| Hi, would like to make 2 subs and get 2x18" speakers into each cabinet based on G Sub design,but want cabinet dimensions to be 1000x500x750 which is smaller than G Sub design. could "V" be the answer to making G Sub smaller? |
Posted By: ex-nihilo
Date Posted: 06 September 2009 at 9:55pm
|
Anybody?
------------- EVERYTHING LOUDER THAN EVERYTHING ELSE |
Posted By: Robbo
Date Posted: 06 September 2009 at 11:16pm
| The cabinet would be considerably bigger than a G sub if you kept the same internal volume and tuning of a G sub as you will now be adding on the "V" cavity section into the cabinets outer shell and so the measurements would increase accordingly. |
Posted By: Teunos
Date Posted: 07 September 2009 at 8:29am
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Less chance of having standing waves? Anybody?
------------- Best regards, Teun. |
Posted By: watchman
Date Posted: 08 September 2009 at 9:53am
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thanks, really want to build 2xsubs same as Ohm Br218s, they measure only 1000x500x750, don't know how they managed to get 2x18s in such a small enclosure, do you know of any similar designs. |
Posted By: lickweed
Date Posted: 18 December 2025 at 3:49am
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old topics never die , whats the conclusion , i mean is it just br ? I know it works really nice , i heard it few times . ------------- http://www.liquidsound.co.uk/ |
Posted By: lickweed
Date Posted: 18 December 2025 at 4:17am
|
Phil mentioned chambers , without knowning whats going on inside , looks like very well executed br , im pretty sure there was discussion back in a day , but thats only thing i found. Instead of starting new one , looks like no intrest , maybe admark ad80 , 100000000 watts . Just joking , lets try to put some life to this very active once forum ------------- http://www.liquidsound.co.uk/ |
Posted By: lickweed
Date Posted: 18 December 2025 at 4:20am
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double ------------- http://www.liquidsound.co.uk/ |
Posted By: lickweed
Date Posted: 18 December 2025 at 4:22am
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;it helps save on bracing so much,raey also said some other mumbo jumbo...; did he ever mentioned , whats other mumbo jumbo
------------- http://www.liquidsound.co.uk/ |
Posted By: lickweed
Date Posted: 18 December 2025 at 5:02am
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Is this in any way , whats going on there ? Found this on za internet. ------------- http://www.liquidsound.co.uk/ |
Posted By: lickweed
Date Posted: 18 December 2025 at 5:09am
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https://www.facebook.com/groups/414219018069770/posts/495420866616251/" rel="nofollow - BOX PLAN PH | VSB218 "CTTO" CREDITS TO THE OWNER FROM GG | Facebook can't upload pic , but thats the one ------------- http://www.liquidsound.co.uk/ |
Posted By: KDW32
Date Posted: 18 December 2025 at 1:44pm
| It's definitely improved from the ohm trs 218 with correct driver |