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dubwize View Drop Down
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    Posted: 26 January 2012 at 11:45am
hi i'm looking at building two OM12 cabs http://billfitzmaurice.net/OmniTop12.html
 
 
and the suggested driver is a eminence Delta pro 12....
 
I have two delta 12a, here in the workshop.... is see that the xmax is halved, what effect would this have on performance... I aim to cross these at 200hz... will the xmax have an effect?
 
and if so what.
 
i do see that the delta pro has a slightly diiferent response, but not much, and the sensitivity is about 1db more.
 
would really appreciate your help..
 
dubz


Edited by dubwize - 26 January 2012 at 11:45am
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soundforyou View Drop Down
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Originally posted by dubwize dubwize wrote:

hi i'm looking at building two OM12 cabs http://billfitzmaurice.net/OmniTop12.html
 
 
and the suggested driver is a eminence Delta pro 12....
 
I have two delta 12a, here in the workshop.... is see that the xmax is halved, what effect would this have on performance... I aim to cross these at 200hz... will the xmax have an effect?
 
and if so what.
 
i do see that the delta pro has a slightly diiferent response, but not much, and the sensitivity is about 1db more.
 
would really appreciate your help..
 
dubz
I have an interest in the reply to this (i think Xmass is the cone displacement forwards and backwards??)
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Earplug View Drop Down
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Above 200Hz it shouldn´t matter.
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Pasi View Drop Down
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Points: 890 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 5:27pm
In my opinion 2.4mm is plenty enough for mid driver working above 200Hz. Would use 24dB/Octave or steeper high pass tough.
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Natty K View Drop Down
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Points: 459 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Natty K Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 5:29pm
edit>@soundforyou<  xmax not xmass it stands for extrusion maximum yes (linear) xmech also known as xlim is the machanical max extrusion(travel)


Edited by Natty K - 26 January 2012 at 5:31pm
'The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it.'
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AJordan View Drop Down
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Points: 426 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AJordan Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 5:40pm
I think you mean excursion. If i spealt that right.Smile
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dubwize View Drop Down
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dubwize Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 5:51pm
Thanks for this,

I'm going to use my ultradrive set to 200hz 24db

The subs will be Tham15..


looks a good plan the OT12, any one built any?
http://www.cardiff-disco.com
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Joe Grime View Drop Down
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Points: 375 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe Grime Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 6:43pm
You may struggle to get to 200 on the tham15 without some eq. 150/160 may be better.
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michalb View Drop Down
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote michalb Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 7:10pm
Hi I've built 4 of the Omni top 12s using the bata 12 driver winch is listed as the budget choice in the plans. Although the delta 12 will work it does not have the rising midrange response that the suggested drivers have. This can probably be accounted for with EQ. are you using peizo or compression drivers? I cross them over at 130hz 24db There dam good boxes considering they only get 200w a box currently.


Michal


Edited by michalb - 26 January 2012 at 7:11pm
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dubwize View Drop Down
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dubwize Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 8:12pm
Well was looking at the deltas, (as i have them here)and adding some eq.... 
I need to have tops that will do at least 500w at 98db sensitivity, to go with my (soon to be upgraded) Tham 15s using 1kw drivers at 98db sens...  need to get all kit including lighting, amps etc into an estate car! 


Not sure about using the piezos, what you using?     I was looking at this - http://cpc.farnell.com/faital-pro/hf104/compression-driver-1-40w-8r/dp/LS03740

and this horn http://cpc.farnell.com/b-c/bme15/horn-flare-1-throat-90-x-60/dp/LS02460

and crossing at 3.5k with this..http://cpc.farnell.com/eminence/pxb2-3k5/crossover-2-way-3-5khz-8ohm/dp/LS00208
http://www.cardiff-disco.com
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soundforyou View Drop Down
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Points: 196 		Post Options Post Options   Thanks (0) Thanks(0)   Quote soundforyou Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2012 at 9:21pm
Originally posted by Natty K Natty K wrote:

edit>@soundforyou<  xmax not xmass it stands for extrusion maximum yes (linear) xmech also known as xlim is the machanical max extrusion(travel)

Thanks 
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