crossover help needed please

paul.42 · 27th July 2007, 10:33 AM

hi,i have recently brought some speakers from a car boot sale,see my earlier post..i'm looking to build some 3-way speakers in the style of wilson watt/puppys,the tweeters are
vifa xt25's
mids are.
vifa xg18wh0008's
and bass will be.seas l22rnx/p

now i want to have a go at building some crossovers,and to be blunt,i haven't got a clue where to start.
can somebody point me in the right direction please..

richie00boy · 27th July 2007, 10:45 AM

Get yourself Dickason's Loudspeaker Design Cookbook, but make sure you read and understand ALL the section on crossovers. You will need measuring mic etc to obtain the acoustic response of the individual drivers.

sreten · 27th July 2007, 11:02 AM

http://www.deadwaxcafe.com/vzone/david/david.htm

http://www.rjbaudio.com/Audiofiles/FRDtools.html

The XG18 sensitivity is not high enough for the two bass units.
You need to add a trap filter to the L22's.

sreten.

paul.42 · 27th July 2007, 12:47 PM

blimmy,nothing is easy is it,i can see me getting in a right state,maybe i'll get some one like wilmslow audio to do them for me,thanks for the reply's guys..

sreten · 27th July 2007, 03:33 PM

Hi,

You could go active bass/ mid, passive mid/treble with 2 stereo amplifiers. Somewhat easier, design flexibility wise.

Or build this with some mods for the tweeter substitution :

http://www.rjbaudio.com/AlpheusMkII/alpheusmkii.html

Wilmslow Audio design service :

Give all the details of baffle layout and slope from the david /
jericho design. Also specify no BSC on the mid unit and the
bass section must fill in the Baffle step as in the D/J.
Also specify trap filters must be used on bass units.
Mid driver : Seas ER18RNX is your best bet IMO.

/sreten.

paul.42 · 27th July 2007, 06:13 PM

i spoke to seas uk earlier and are expecting the er18rnx in mid august,thanks for the input

27th July 2007, 10:33 AM	#1
paul.42 diyAudio Member Join Date: Jul 2007	crossover help needed please hi,i have recently brought some speakers from a car boot sale,see my earlier post..i'm looking to build some 3-way speakers in the style of wilson watt/puppys,the tweeters are vifa xt25's mids are. vifa xg18wh0008's and bass will be.seas l22rnx/p now i want to have a go at building some crossovers,and to be blunt,i haven't got a clue where to start. can somebody point me in the right direction please..

27th July 2007, 10:45 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Get yourself Dickason's Loudspeaker Design Cookbook, but make sure you read and understand ALL the section on crossovers. You will need measuring mic etc to obtain the acoustic response of the individual drivers. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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27th July 2007, 11:02 AM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://www.deadwaxcafe.com/vzone/david/david.htm http://www.rjbaudio.com/Audiofiles/FRDtools.html The XG18 sensitivity is not high enough for the two bass units. You need to add a trap filter to the L22's. sreten.

27th July 2007, 12:47 PM	#4
paul.42 diyAudio Member Join Date: Jul 2007	blimmy,nothing is easy is it,i can see me getting in a right state,maybe i'll get some one like wilmslow audio to do them for me,thanks for the reply's guys..

27th July 2007, 03:33 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, You could go active bass/ mid, passive mid/treble with 2 stereo amplifiers. Somewhat easier, design flexibility wise. Or build this with some mods for the tweeter substitution : http://www.rjbaudio.com/AlpheusMkII/alpheusmkii.html Wilmslow Audio design service : Give all the details of baffle layout and slope from the david / jericho design. Also specify no BSC on the mid unit and the bass section must fill in the Baffle step as in the D/J. Also specify trap filters must be used on bass units. Mid driver : Seas ER18RNX is your best bet IMO. /sreten.

27th July 2007, 06:13 PM	#6
paul.42 diyAudio Member Join Date: Jul 2007	i spoke to seas uk earlier and are expecting the er18rnx in mid august,thanks for the input

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