Crossover component selection

Helpful hints on how to build 'em, and where to get the stuff you need.
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Charles Jenkinson
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Joined: Sat Aug 06, 2011 3:25 pm
Location: Manchester, UK

Crossover component selection

#1 Post by Charles Jenkinson »

I have a project to build some wedges & DR250’s. I would greatly appreciate a swift heads up on if I’ve selected the right components for the generic 8 ohm woofer and piezo’s crossover setup. I’m selecting parts from Loud Speaker Freaks - http://loudspeakerfreaks.com/Producten_ab.asp?code=10 , except for the 30ohm resistor – it’s a great website, being able to choose/filter by component size/rating. Any alternative component recommendations appreciated. Thanks for looking.

Piezo hi pass:

Jantzen 5,60 µF cross cap Vdc 400 volt 5% £2.68 ea.
http://loudspeakerfreaks.com/Product.as ... ct_ID=8951

Jantzen 0,500 mH air core coil Cu 0,5 (24AWG) Rdc 1,000 Ohm £1.63 ea.
http://loudspeakerfreaks.com/Product.as ... ct_ID=9095

Ceramic 3,90 Ohm resistor 20W 5% (4ohm required) £0.69 ea
http://loudspeakerfreaks.com/Product.as ... ct_ID=1825

Off ebay (LSF only do 27 or 33 ohm, & the 27 is not ceramic): 10pcs Axial Lead Fixed Ceramic Cement Resistor 10W 30 Ohm £4.46/10
http://www.ebay.co.uk/itm/like/29156635 ... 143&crdt=0


Woofer low pass:

Jantzen 0,600 mH iron core coil Cu 0,8 (20AWG) Rdc 0,260 Ohm £2.21 ea
http://loudspeakerfreaks.com/Product.as ... t_ID=10232

Jantzen 15,0 µF BI-polarized electrolytic cap Vdc 100 volt 10% £0.37 ea.
http://loudspeakerfreaks.com/Product.as ... t_ID=11608
2xJ12L (3012HO) switchable/melded
2xT30

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Bill Fitzmaurice
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Posts: 28620
Joined: Tue May 02, 2006 5:59 pm

Re: Crossover component selection

#2 Post by Bill Fitzmaurice »

20 ga is a bit light for the low pass coil. I'd go no less than 18 ga. The plans only mention DCR, but that's because I've never seen a .6mH solid core inductor of less than 16 ga. As for the 30 ohm resistor, 33 ohms will work fine, being within the 10% value tolerance.

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