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NCA VSB 218 |
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ex-nihilo 
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Joined: 27 February 2009 Location: Manchester Status: Offline Points: 42 |
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 Topic: NCA VSB 218Posted: 19 August 2009 at 6:39pm |
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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...
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EVERYTHING LOUDER THAN EVERYTHING ELSE
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highlyunlikely
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Posted: 19 August 2009 at 11:26pm |
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it helps save on bracing so much,raey also said some other mumbo jumbo...
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jonminns
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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
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djeddie
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Posted: 20 August 2009 at 6:53pm |
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I've always thought that, but there are many on here who would fire up Horn Response...
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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ex-nihilo
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Posted: 22 August 2009 at 11:37pm |
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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...
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EVERYTHING LOUDER THAN EVERYTHING ELSE
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colinmono
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Joined: 10 October 2007 Location: Midlands UK Status: Offline Points: 1113 |
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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. |
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norty303
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Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
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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
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My laser stuff: Frikkin Lasers
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Phil B
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Posted: 23 August 2009 at 11:42am |
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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 !
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norty303
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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
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My laser stuff: Frikkin Lasers
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ex-nihilo
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Posted: 23 August 2009 at 2:13pm |
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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...
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watchman
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Posted: 24 August 2009 at 8:31pm |
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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?
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ex-nihilo
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Posted: 06 September 2009 at 9:55pm |
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Anybody?
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ex-nihilo wrote: