Simple answer required for a simple question...

rabbitz · 31st August 2003, 09:30 AM

When using 2 woofers in parallel the combined impedance is halved. Which value do you use for the crossover design calculation? The single woofer (eg 8 Ohm) or the halved value (eg 4 Ohm). Can't find a direct reference to this in the Loudspeaker Design Cookbook.

Vikash · 31st August 2003, 10:11 AM

If the xover is going to see 4 ohms, then it would seem intuitive to work with 4 ohms regardless of the individual driver resistance.

I've yet to build an xover though, so wait for confirmation on this

subwo1 · 31st August 2003, 10:36 AM

That is right. Make for a 4 ohm load.

rabbitz · 31st August 2003, 11:03 AM

Thanks guys. Much appreciated. It's one of those simple things I haven't been able to find by searching this site or the web.

subwo1 · 31st August 2003, 11:05 AM

Best Wishes.

31st August 2003, 09:30 AM	#1
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Simple answer required for a simple question... When using 2 woofers in parallel the combined impedance is halved. Which value do you use for the crossover design calculation? The single woofer (eg 8 Ohm) or the halved value (eg 4 Ohm). Can't find a direct reference to this in the Loudspeaker Design Cookbook.

31st August 2003, 10:36 AM	#3
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	That is right. Make for a 4 ohm load. __________________ USMPS http://groups.yahoo.com/group/switchmode/

31st August 2003, 11:03 AM	#4
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Thanks...... Thanks guys. Much appreciated. It's one of those simple things I haven't been able to find by searching this site or the web.

31st August 2003, 11:05 AM	#5
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	Best Wishes. __________________ USMPS http://groups.yahoo.com/group/switchmode/

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31st August 2003, 10:11 AM	#2
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	If the xover is going to see 4 ohms, then it would seem intuitive to work with 4 ohms regardless of the individual driver resistance. I've yet to build an xover though, so wait for confirmation on this

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