My BassHorn VS Martin WSX |
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Amano
Registered User Joined: 06 October 2008 Location: Russia Status: Offline Points: 219 |
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http://photofile.ru/photo/amanosempai/135165722/xlarge/138250109.jpg Edited by Amano - 21 October 2008 at 3:34am |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Hi Amano! Is that driver offset to the throat? Try to imagine a very small gap, and a coil/capton has to fit snug in that gap, now it has to move backwards and forwards at a very fast pace, any non-linear action will burn out the coils fast Efficient drivers have even smaller gaps like the PD1850, this is why the PD1850 has a monster double spider, to keep the "PISTON ACTION" linear There has to be even pressure on the cone face for perfect linear motion You might be lucky and find its ok, but do you really want to take that chance? The chamber is also small; this will have a very good ‘SPRING EFFECT’ on the cone. This may not help matters with an offset throat Do you have a print of the SPL Graph for this box? |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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If you can improve on that throat area.....
I think this could be a very good "TURBO" sounding box, as in fast and punchy, quite efficient
EDIT: just noticed something, what have you taken as your throat area?
If its the point were it says 75mm, this will be the throat @ 403.5 cm2, if you have taken the throat area as 228 x 228, if its square? this will be 519.84 cm2 and is larger than the 403.5cm2
the thing is, it looks like you have 2 throats? have you taken this into account
you have the volume in front of the cone, plus the cone area, to have a throat it needs to be smaller than the cone size, for instance an average cone size for a 18'' is roughly 1200cm2, unless you are using the circular cuttout as the throat! and in this case you're not.
so lets look at this.........
cone area = 1200cm2 + an average 4.5 litres of volume in the cone
then we have a smaller area of half the size? 519.84 cm2
then we have some more volume in front of the 519.84cm2, then an even smaller area that I think you have used as the throat area = 403.5cm2 ?
1200cm2 - 519.84cm2 - 403.5cm2
how much have you calculated as throat chamber? you have 2 chambers in front of the cone/driver
just call me eagle eye from now on! Edited by mykey - 21 October 2008 at 8:55am |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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.... or you could call me "Mr Twothroats"
Hello! my name is Mr Twothroats...
and have you got two throats Mr?
....NO!... thats just my name
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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The 2x15" cabinet shown on page one of this post is basically a shrunk down Martin Audio S bin---and you have exactly the same problems with it as the original Martin design---IT WILL NOT GO THROUGH MOST DOORWAYS so it is not a practical design as you would never be able to get it into most venues---the single 15 version should be quite nice though.
In the single 18" horn shown above, it needs loading to fire through a slot in the baffle board the same as Martin design and the slot must be centred on the cone dia as the off centre loading as shown will cause cones to disintegrate in that cabinet design/
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Amano
Registered User Joined: 06 October 2008 Location: Russia Status: Offline Points: 219 |
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Amano
Registered User Joined: 06 October 2008 Location: Russia Status: Offline Points: 219 |
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Edited by Amano - 22 October 2008 at 7:43am |
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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Well at least the chamber got bigger.
Horn looks smaller though. |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Amano, can you give us 1w1m please
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Amano
Registered User Joined: 06 October 2008 Location: Russia Status: Offline Points: 219 |
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1w1m 2pi: |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Not bad, from memory it looks better than the WSX
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Amano! your throat would be 597cm2 not 420cm2 so this would aslo shorten the length of the horn |
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