Midrange crossover question

dubeiram · 21st December 2005, 01:37 AM

I read on the wiki that it is best to use the impedence of a speaker at its xover frequency not its nominal impedance.. so in the case of the Audax ap17ozo its nominal imp is 6 ohms... its impedence at the crossover frequency I'd like to use 3000hz is 11.6 ohms... I will use it in a 3 way setup and that would be the high crossover.. now my question is if I put in a zobel network to control the impendence at high freq... and if I calc correctly.. Rz is 1.25 x Rnom = 8 ohms.. and the cap is Le/Rzsquared = 11.6 uf.. will this effect the speaker impendence at 3000hz?? in effect knocking down the 11.6 ohms impedence with the zobel network installed... that is what it is for.. right???

Bud

sreten · 21st December 2005, 08:34 AM

The purpose of an ideal zobel network is to exactly cancel the inductance.
The ideal zobel resistor value is the DC resistance of the driver.

Consequently the impedance of an ideally Zobelled driver is its DC resistance.

A non-ideal zobel network can be used to reduce the variation of impedance.

/sreten.

dubeiram · 21st December 2005, 11:06 AM

streten

Thank you for the reply... so are you saying I shouldn't design the xover to the 11.6 ohm value which is the impendance of the audax at 3000hz... but to the 6 ohm impendance with the zobel circuit compensating for the inductance...

Thanks

Bud

21st December 2005, 01:37 AM	#1
dubeiram diyAudio Member Join Date: Dec 2005 Location: new jersey	Midrange crossover question I read on the wiki that it is best to use the impedence of a speaker at its xover frequency not its nominal impedance.. so in the case of the Audax ap17ozo its nominal imp is 6 ohms... its impedence at the crossover frequency I'd like to use 3000hz is 11.6 ohms... I will use it in a 3 way setup and that would be the high crossover.. now my question is if I put in a zobel network to control the impendence at high freq... and if I calc correctly.. Rz is 1.25 x Rnom = 8 ohms.. and the cap is Le/Rzsquared = 11.6 uf.. will this effect the speaker impendence at 3000hz?? in effect knocking down the 11.6 ohms impedence with the zobel network installed... that is what it is for.. right??? Bud

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21st December 2005, 08:34 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	The purpose of an ideal zobel network is to exactly cancel the inductance. The ideal zobel resistor value is the DC resistance of the driver. Consequently the impedance of an ideally Zobelled driver is its DC resistance. A non-ideal zobel network can be used to reduce the variation of impedance. /sreten.

21st December 2005, 11:06 AM	#3
dubeiram diyAudio Member Join Date: Dec 2005 Location: new jersey	streten Thank you for the reply... so are you saying I shouldn't design the xover to the 11.6 ohm value which is the impendance of the audax at 3000hz... but to the 6 ohm impendance with the zobel circuit compensating for the inductance... Thanks Bud

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