2nd diy sub project

lordy · 26th June 2004, 06:40 PM

Hi
I am looking to make a high power sub for PA use that will provide enough bass for a hall thats around 18m by 12m but i only have enough room for 1 sub (max size 800mm by 600mm by 500mm) in my car could i build a LOUD efficient horn this size?
The speaker i have for this project is a zeuz 18" 500 watts taken from the old sub that wasnt a success LOL(i have no idea about the parameters).
Any ideas on designs ?
Do i need a massive box to get really low bass that can be felt ?

cheers
Rob

tom daghdha · 26th June 2004, 07:40 PM

download WinISD, that'll work everything out for you & plot line for each volume.

RobWells · 27th June 2004, 01:03 AM

Quote:

Originally posted by tom daghdha
download WinISD, that'll work everything out for you & plot line for each volume.

Not for a horn it won't. There's a lot of people here who can help though. - Try a search on horn response (I think that's what it's called)

Rob

BillFitzmaurice · 27th June 2004, 01:18 AM

For the size box you are able to use you won't be able to use a horn because the 18" driver is so large that there isn't enough room left over for the horn. If you must keep the 18 you're best off going with a vented box. You can get far better result with a folded horn but in your available space you'll have to use one loaded with a ten or twelve.

mikee12345 · 27th June 2004, 04:17 PM

www.users.bigpond.com/dmcbean

Bill hit it on the head...a 12" will do much the same at better size efficiency.

the labhorn at work. 2x12" lab12 in each.
btw i dont know why the mains are sidebyside

=it wasnt me

mikee12345 · 27th June 2004, 04:21 PM

Also i noticed you dont know the t/s specs.
either measure them (www.diysubwoofers.org)

,or chuck it on a box ,perhaps 4cubes tuned to 42hz and see what happens!

without specs you can only guess.

solid 40hz reproduction suprises people,they think its real low....sometimes im even foold,i have to check the FFT of the tune to see its not 30hz,but 40!

lordy · 29th June 2004, 08:05 PM

thanks for all the replys
i think i will make a small box ind if that turns out ok then ile make a couple more or i could buy a van and make a folded horn

Rob

BillFitzmaurice · 29th June 2004, 09:03 PM

The van isn't necessary; my HT horn loaded sub measures only 45 cm cubed, but obviously it doesn't use an eighteen; it uses an eight. My pro-sound sub measures 60 cm cubed; it's loaded with a ten. The whole point of horns is to get high output from small drivers. Direct radiator boxes use large drivers because they have to; horns use small drivers because they are able to.

26th June 2004, 06:40 PM	#1
lordy diyAudio Member Join Date: Feb 2003 Location: Manchester UK	2nd diy sub project Hi I am looking to make a high power sub for PA use that will provide enough bass for a hall thats around 18m by 12m but i only have enough room for 1 sub (max size 800mm by 600mm by 500mm) in my car could i build a LOUD efficient horn this size? The speaker i have for this project is a zeuz 18" 500 watts taken from the old sub that wasnt a success LOL(i have no idea about the parameters). Any ideas on designs ? Do i need a massive box to get really low bass that can be felt ? cheers Rob

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26th June 2004, 07:40 PM	#2
tom daghdha diyAudio Member Join Date: May 2004 Location: Liverpool / Leeds, UK	download WinISD, that'll work everything out for you & plot line for each volume.

27th June 2004, 01:18 AM	#4
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	For the size box you are able to use you won't be able to use a horn because the 18" driver is so large that there isn't enough room left over for the horn. If you must keep the 18 you're best off going with a vented box. You can get far better result with a folded horn but in your available space you'll have to use one loaded with a ten or twelve.

27th June 2004, 04:21 PM	#6
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	Also i noticed you dont know the t/s specs. either measure them (www.diysubwoofers.org) ,or chuck it on a box ,perhaps 4cubes tuned to 42hz and see what happens! without specs you can only guess. solid 40hz reproduction suprises people,they think its real low....sometimes im even foold,i have to check the FFT of the tune to see its not 30hz,but 40!

29th June 2004, 08:05 PM	#7
lordy diyAudio Member Join Date: Feb 2003 Location: Manchester UK	thanks for all the replys i think i will make a small box ind if that turns out ok then ile make a couple more or i could buy a van and make a folded horn Rob

29th June 2004, 09:03 PM	#8
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	The van isn't necessary; my HT horn loaded sub measures only 45 cm cubed, but obviously it doesn't use an eighteen; it uses an eight. My pro-sound sub measures 60 cm cubed; it's loaded with a ten. The whole point of horns is to get high output from small drivers. Direct radiator boxes use large drivers because they have to; horns use small drivers because they are able to.

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